diff --git a/compile.hxml b/compile.hxml
index 00e9d2cd..496d7199 100644
--- a/compile.hxml
+++ b/compile.hxml
@@ -1,6 +1,8 @@
 -cp src
 -lib heaps
 -lib hlsdl
+-lib hxWebSockets
+-lib datachannel
 -hl marblegame.hl
 -D windowSize=1280x720
 -D keep-inline-positions
diff --git a/server/Signalling.hx b/server/Signalling.hx
new file mode 100644
index 00000000..c7376b08
--- /dev/null
+++ b/server/Signalling.hx
@@ -0,0 +1,38 @@
+import haxe.Json;
+import hx.ws.SocketImpl;
+import hx.ws.WebSocketHandler;
+import hx.ws.WebSocketServer;
+
+using Lambda;
+
+class SignallingHandler extends WebSocketHandler {
+	static var clients:Array<SignallingHandler> = [];
+
+	public function new(s:SocketImpl) {
+		super(s);
+		onopen = () -> {
+			clients.push(this);
+		}
+		onclose = () -> {
+			clients.remove(this);
+		}
+		onmessage = (m) -> {
+			switch (m) {
+				case StrMessage(content):
+					var conts = Json.parse(content);
+					if (conts.type == "connect") {
+						var other = clients.find(x -> x != this);
+						other.send(Json.stringify(conts.sdpObj));
+					}
+				case _: {}
+			}
+		}
+	}
+}
+
+class Signalling {
+	static function main() {
+		var ws = new WebSocketServer<SignallingHandler>("0.0.0.0", 8080, 2);
+		ws.start();
+	}
+}
diff --git a/server/build_signalling.hxml b/server/build_signalling.hxml
new file mode 100644
index 00000000..924cb71c
--- /dev/null
+++ b/server/build_signalling.hxml
@@ -0,0 +1,5 @@
+--library hxWebSockets
+--library datachannel
+--main Signalling
+-cp .
+--hl bin/signalling.hl
\ No newline at end of file
diff --git a/src/Console.hx b/src/Console.hx
index f554e969..946b1c3b 100644
--- a/src/Console.hx
+++ b/src/Console.hx
@@ -184,6 +184,9 @@ class Console {
 				log('Allocation Count: ${gc.allocationCount}');
 				log('Memory usage: ${gc.currentMemory}');
 				#end
+			} else if (cmdType == 'rollback') {
+				var t = Std.parseFloat(cmdSplit[1]);
+				MarbleGame.instance.world.rollback(t);
 			} else {
 				error("Unknown command");
 			}
diff --git a/src/DynamicPolygon.hx b/src/DynamicPolygon.hx
index 4f4ba1af..488e747b 100644
--- a/src/DynamicPolygon.hx
+++ b/src/DynamicPolygon.hx
@@ -298,94 +298,4 @@ class DynamicPolygon extends MeshPrimitive {
 		else
 			engine.renderMultiBuffers(bufs, engine.mem.triIndexes, 0, triCount());
 	}
-
-	#if hxbit
-	override function customSerialize(ctx:hxbit.Serializer) {
-		ctx.addInt(points.length);
-		for (p in points) {
-			ctx.addDouble(p.x);
-			ctx.addDouble(p.y);
-			ctx.addDouble(p.z);
-		}
-		if (normals == null)
-			ctx.addInt(0);
-		else {
-			ctx.addInt(normals.length);
-			for (p in normals) {
-				ctx.addDouble(p.x);
-				ctx.addDouble(p.y);
-				ctx.addDouble(p.z);
-			}
-		}
-		if (tangents == null)
-			ctx.addInt(0);
-		else {
-			ctx.addInt(tangents.length);
-			for (p in tangents) {
-				ctx.addDouble(p.x);
-				ctx.addDouble(p.y);
-				ctx.addDouble(p.z);
-			}
-		}
-		if (uvs == null)
-			ctx.addInt(0);
-		else {
-			ctx.addInt(uvs.length);
-			for (uv in uvs) {
-				ctx.addDouble(uv.u);
-				ctx.addDouble(uv.v);
-			}
-		}
-		if (idx == null)
-			ctx.addInt(0);
-		else {
-			ctx.addInt(idx.length);
-			for (i in idx)
-				ctx.addInt(i);
-		}
-		if (colors == null)
-			ctx.addInt(0);
-		else {
-			ctx.addInt(colors.length);
-			for (c in colors) {
-				ctx.addDouble(c.x);
-				ctx.addDouble(c.y);
-				ctx.addDouble(c.z);
-			}
-		}
-	}
-
-	override function customUnserialize(ctx:hxbit.Serializer) {
-		points = [
-			for (i in 0...ctx.getInt())
-				new h3d.col.Point(ctx.getDouble(), ctx.getDouble(), ctx.getDouble())
-		];
-		normals = [
-			for (i in 0...ctx.getInt())
-				new h3d.col.Point(ctx.getDouble(), ctx.getDouble(), ctx.getDouble())
-		];
-		tangents = [
-			for (i in 0...ctx.getInt())
-				new h3d.col.Point(ctx.getDouble(), ctx.getDouble(), ctx.getDouble())
-		];
-		uvs = [for (i in 0...ctx.getInt()) new UV(ctx.getDouble(), ctx.getDouble())];
-		if (normals.length == 0)
-			normals = null;
-		if (uvs.length == 0)
-			uvs = null;
-		var nindex = ctx.getInt();
-		if (nindex > 0) {
-			idx = new hxd.IndexBuffer();
-			idx.grow(nindex);
-			for (i in 0...nindex)
-				idx[i] = ctx.getInt();
-		}
-		colors = [
-			for (i in 0...ctx.getInt())
-				new h3d.col.Point(ctx.getDouble(), ctx.getDouble(), ctx.getDouble())
-		];
-		if (colors.length == 0)
-			colors = null;
-	}
-	#end
 }
diff --git a/src/Main.hx b/src/Main.hx
index 5fee9e17..6ca98cfc 100644
--- a/src/Main.hx
+++ b/src/Main.hx
@@ -1,5 +1,6 @@
 package;
 
+import datachannel.RTC;
 import gui.VersionGui;
 import gui.PresentsGui;
 import src.Debug;
@@ -88,6 +89,7 @@ class Main extends hxd.App {
 		#end
 
 		// try {
+		RTC.init();
 		Http.init();
 		haxe.MainLoop.add(() -> Http.loop());
 		Settings.init();
@@ -148,6 +150,7 @@ class Main extends hxd.App {
 			// 	marbleGame.update(1 / 60);
 			// 	timeAccumulator -= 1 / 60;
 			// }
+			RTC.processEvents();
 			marbleGame.update(dt);
 			// } catch (e) {
 			// Console.error(e.message);
diff --git a/src/Marble.hx b/src/Marble.hx
index ac5bbe45..17dd5768 100644
--- a/src/Marble.hx
+++ b/src/Marble.hx
@@ -66,6 +66,7 @@ import src.ResourceLoaderWorker;
 import src.InteriorObject;
 import src.Console;
 import src.Gamepad;
+import net.Net;
 
 class Move {
 	public var d:Vector;
@@ -284,12 +285,15 @@ class Marble extends GameObject {
 
 	public var cubemapRenderer:CubemapRenderer;
 
+	var connection:net.Net.ClientConnection;
+
 	public function new() {
 		super();
 
 		this.velocity = new Vector();
 		this.omega = new Vector();
 		this.camera = new CameraController(cast this);
+		this.isCollideable = true;
 
 		this.bounceEmitterData = new ParticleData();
 		this.bounceEmitterData.identifier = "MarbleBounceParticle";
@@ -318,8 +322,9 @@ class Marble extends GameObject {
 		this.helicopterSound.pause = true;
 	}
 
-	public function init(level:MarbleWorld, onFinish:Void->Void) {
+	public function init(level:MarbleWorld, connection:ClientConnection, onFinish:Void->Void) {
 		this.level = level;
+		this.connection = connection;
 		if (this.level != null)
 			this.collisionWorld = this.level.collisionWorld;
 
@@ -522,6 +527,8 @@ class Marble extends GameObject {
 
 	public function getMarbleAxis() {
 		var motiondir = new Vector(0, -1, 0);
+		if (level.isReplayingMovement)
+			return level.currentInputMoves[1].marbleAxes;
 		if (this.controllable) {
 			motiondir.transform(Matrix.R(0, 0, camera.CameraYaw));
 			motiondir.transform(level.newOrientationQuat.toMatrix());
@@ -561,7 +568,7 @@ class Marble extends GameObject {
 			for (contact in contacts) {
 				if (contact.force != 0 && !forceObjects.contains(contact.otherObject)) {
 					if (contact.otherObject is RoundBumper) {
-						if (!playedSounds.contains("data/sound/bumperding1.wav")) {
+						if (!level.isReplayingMovement && !playedSounds.contains("data/sound/bumperding1.wav")) {
 							AudioManager.playSound(ResourceLoader.getResource("data/sound/bumperding1.wav", ResourceLoader.getAudio, this.soundResources));
 							playedSounds.push("data/sound/bumperding1.wav");
 						}
@@ -605,6 +612,8 @@ class Marble extends GameObject {
 		var R = currentGravityDir.multiply(-this._radius);
 		var rollVelocity = this.omega.cross(R);
 		var axes = this.getMarbleAxis();
+		if (!level.isReplayingMovement)
+			level.inputRecorder.recordAxis(axes);
 		var sideDir = axes[0];
 		var motionDir = axes[1];
 		var upDir = axes[2];
@@ -799,7 +808,7 @@ class Marble extends GameObject {
 			}
 			if (sv < this._jumpImpulse) {
 				this.velocity.load(this.velocity.add(bestContact.normal.multiply((this._jumpImpulse - sv))));
-				if (!playedSounds.contains("data/sound/jump.wav")) {
+				if (!level.isReplayingMovement && !playedSounds.contains("data/sound/jump.wav")) {
 					AudioManager.playSound(ResourceLoader.getResource("data/sound/jump.wav", ResourceLoader.getAudio, this.soundResources));
 					playedSounds.push("data/sound/jump.wav");
 				}
@@ -879,7 +888,7 @@ class Marble extends GameObject {
 	}
 
 	function bounceEmitter(speed:Float, normal:Vector) {
-		if (!this.controllable)
+		if (!this.controllable || level.isReplayingMovement)
 			return;
 		if (this.bounceEmitDelay == 0 && this._minBounceSpeed <= speed) {
 			this.level.particleManager.createEmitter(bounceParticleOptions, this.bounceEmitterData,
@@ -914,6 +923,8 @@ class Marble extends GameObject {
 	}
 
 	function playBoundSound(time:Float, contactVel:Float) {
+		if (level.isReplayingMovement)
+			return;
 		if (minVelocityBounceSoft <= contactVel) {
 			var hardBounceSpeed = minVelocityBounceHard;
 			var bounceSoundNum = Math.floor(Math.random() * 4);
@@ -943,6 +954,8 @@ class Marble extends GameObject {
 	}
 
 	function updateRollSound(time:TimeState, contactPct:Float, slipAmount:Float) {
+		if (level.isReplayingMovement)
+			return;
 		var rSpat = rollSound.getEffect(Spatialization);
 		rSpat.position = this.collider.transform.getPosition();
 
@@ -1542,6 +1555,7 @@ class Marble extends GameObject {
 			// this.setPosition(newPos.x, newPos.y, newPos.z);
 
 			this.collider.setTransform(totMatrix);
+			this.collisionWorld.updateTransform(this.collider);
 			this.collider.velocity = this.velocity;
 
 			if (this.heldPowerup != null && m.powerup && !this.level.outOfBounds) {
@@ -1592,41 +1606,139 @@ class Marble extends GameObject {
 		this.updateRollSound(timeState, contactTime / timeState.dt, this._slipAmount);
 	}
 
-	public function update(timeState:TimeState, collisionWorld:CollisionWorld, pathedInteriors:Array<PathedInterior>) {
-		var move = new Move();
-		move.d = new Vector();
-		if (this.controllable && this.mode != Finish && !MarbleGame.instance.paused && !this.level.isWatching) {
-			move.d.x = Gamepad.getAxis(Settings.gamepadSettings.moveYAxis);
-			move.d.y = -Gamepad.getAxis(Settings.gamepadSettings.moveXAxis);
-			if (Key.isDown(Settings.controlsSettings.forward)) {
-				move.d.x -= 1;
+	// MP Only Functions
+	public function updateServer(timeState:TimeState, collisionWorld:CollisionWorld, pathedInteriors:Array<PathedInterior>) {
+		var move:Move = null;
+		if (this.controllable && this.mode != Finish && !MarbleGame.instance.paused && !this.level.isWatching && !this.level.isReplayingMovement) {
+			move = recordMove();
+		}
+		if (!this.controllable && this.connection != null) {
+			move = new Move();
+			move.d = new Vector(0, 0);
+		}
+
+		playedSounds = [];
+		advancePhysics(timeState, move, collisionWorld, pathedInteriors);
+
+		physicsAccumulator = 0;
+	}
+
+	public function updateClient(timeState:TimeState, pathedInteriors:Array<PathedInterior>) {
+		if (oldPos != null && newPos != null) {
+			var deltaT = physicsAccumulator / 0.032;
+			var renderPos = Util.lerpThreeVectors(this.oldPos, this.newPos, deltaT);
+			this.setPosition(renderPos.x, renderPos.y, renderPos.z);
+
+			var rot = this.prevRot;
+			var quat = new Quat();
+			quat.initRotation(omega.x * physicsAccumulator, omega.y * physicsAccumulator, omega.z * physicsAccumulator);
+			quat.multiply(quat, rot);
+			this.setRotationQuat(quat);
+
+			var adt = timeState.clone();
+			adt.dt = physicsAccumulator;
+			for (pi in pathedInteriors) {
+				pi.update(adt);
 			}
-			if (Key.isDown(Settings.controlsSettings.backward)) {
-				move.d.x += 1;
-			}
-			if (Key.isDown(Settings.controlsSettings.left)) {
-				move.d.y += 1;
-			}
-			if (Key.isDown(Settings.controlsSettings.right)) {
-				move.d.y -= 1;
-			}
-			if (Key.isDown(Settings.controlsSettings.jump)
-				|| MarbleGame.instance.touchInput.jumpButton.pressed
-				|| Gamepad.isDown(Settings.gamepadSettings.jump)) {
-				move.jump = true;
-			}
-			if ((!Util.isTouchDevice() && Key.isDown(Settings.controlsSettings.powerup))
-				|| (Util.isTouchDevice() && MarbleGame.instance.touchInput.powerupButton.pressed)
-				|| Gamepad.isDown(Settings.gamepadSettings.powerup)) {
-				move.powerup = true;
-			}
-			if (MarbleGame.instance.touchInput.movementInput.pressed) {
-				move.d.y = -MarbleGame.instance.touchInput.movementInput.value.x;
-				move.d.x = MarbleGame.instance.touchInput.movementInput.value.y;
+		}
+		physicsAccumulator += timeState.dt;
+
+		if (this.controllable && this.level != null && !this.level.rewinding) {
+			// this.camera.startCenterCamera();
+			this.camera.update(timeState.currentAttemptTime, timeState.dt);
+		}
+
+		updatePowerupStates(timeState.currentAttemptTime, timeState.dt);
+
+		var s = this._renderScale * this._renderScale;
+		if (s <= this._marbleScale * this._marbleScale)
+			s = 0.1;
+		else
+			s = 0.4;
+
+		s = timeState.dt / s * 2.302585124969482;
+		s = 1.0 / (s * (s * 0.2349999994039536 * s) + s + 1.0 + 0.4799999892711639 * s * s);
+		this._renderScale *= s;
+		s = 1 - s;
+		this._renderScale += s * this._marbleScale;
+		var marbledts = cast(this.getChildAt(0), DtsObject);
+		marbledts.setScale(this._renderScale);
+
+		if (this._radius != 0.675 && timeState.currentAttemptTime - this.megaMarbleEnableTime < 10) {
+			this._prevRadius = this._radius;
+			this._radius = 0.675;
+			this.collider.radius = 0.675;
+			this._marbleScale *= 2.25;
+			var boost = this.level.currentUp.multiply(5);
+			this.velocity = this.velocity.add(boost);
+		} else if (timeState.currentAttemptTime - this.megaMarbleEnableTime > 10) {
+			if (this._radius != this._prevRadius) {
+				this._radius = this._prevRadius;
+				this.collider.radius = this._radius;
+				this._marbleScale = this._defaultScale;
+				AudioManager.playSound(ResourceLoader.getResource("data/sound/MegaShrink.wav", ResourceLoader.getAudio, this.soundResources), null, false);
 			}
 		}
 
+		this.updateFinishAnimation(timeState.dt);
+		if (this.mode == Finish) {
+			this.setPosition(this.finishAnimPosition.x, this.finishAnimPosition.y, this.finishAnimPosition.z);
+			updatePowerupStates(timeState.currentAttemptTime, timeState.dt);
+		}
+
+		this.trailEmitter();
+		if (bounceEmitDelay > 0)
+			bounceEmitDelay -= timeState.dt;
+		if (bounceEmitDelay < 0)
+			bounceEmitDelay = 0;
+	}
+
+	public function recordMove() {
+		var move = new Move();
+		move.d = new Vector();
+		move.d.x = Gamepad.getAxis(Settings.gamepadSettings.moveYAxis);
+		move.d.y = -Gamepad.getAxis(Settings.gamepadSettings.moveXAxis);
+		if (Key.isDown(Settings.controlsSettings.forward)) {
+			move.d.x -= 1;
+		}
+		if (Key.isDown(Settings.controlsSettings.backward)) {
+			move.d.x += 1;
+		}
+		if (Key.isDown(Settings.controlsSettings.left)) {
+			move.d.y += 1;
+		}
+		if (Key.isDown(Settings.controlsSettings.right)) {
+			move.d.y -= 1;
+		}
+		if (Key.isDown(Settings.controlsSettings.jump)
+			|| MarbleGame.instance.touchInput.jumpButton.pressed
+			|| Gamepad.isDown(Settings.gamepadSettings.jump)) {
+			move.jump = true;
+		}
+		if ((!Util.isTouchDevice() && Key.isDown(Settings.controlsSettings.powerup))
+			|| (Util.isTouchDevice() && MarbleGame.instance.touchInput.powerupButton.pressed)
+			|| Gamepad.isDown(Settings.gamepadSettings.powerup)) {
+			move.powerup = true;
+		}
+		if (MarbleGame.instance.touchInput.movementInput.pressed) {
+			move.d.y = -MarbleGame.instance.touchInput.movementInput.value.x;
+			move.d.x = MarbleGame.instance.touchInput.movementInput.value.y;
+		}
+		return move;
+	}
+
+	// SP only function
+	public function update(timeState:TimeState, collisionWorld:CollisionWorld, pathedInteriors:Array<PathedInterior>) {
+		var move:Move = null;
+		if (this.controllable && this.mode != Finish && !MarbleGame.instance.paused && !this.level.isWatching && !this.level.isReplayingMovement) {
+			move = recordMove();
+		}
+
+		if (level.isReplayingMovement)
+			move = level.currentInputMoves[1].move;
+
 		if (this.controllable && this.level.isWatching) {
+			move = new Move();
 			if (this.level.replay.currentPlaybackFrame.marbleStateFlags.has(Jumped))
 				move.jump = true;
 			if (this.level.replay.currentPlaybackFrame.marbleStateFlags.has(UsedPowerup))
@@ -1638,6 +1750,10 @@ class Marble extends GameObject {
 				this.level.replay.recordMarbleInput(move.d.x, move.d.y);
 			}
 		}
+		if (!this.controllable && this.connection != null) {
+			move = new Move();
+			move.d = new Vector(0, 0);
+		}
 
 		physicsAccumulator += timeState.dt;
 
diff --git a/src/MarbleGame.hx b/src/MarbleGame.hx
index a9a3fc55..1632aee3 100644
--- a/src/MarbleGame.hx
+++ b/src/MarbleGame.hx
@@ -323,14 +323,14 @@ class MarbleGame {
 		Settings.save();
 	}
 
-	public function playMission(mission:Mission) {
+	public function playMission(mission:Mission, multiplayer:Bool = false) {
 		canvas.clearContent();
 		destroyPreviewWorld();
 		if (world != null) {
 			world.dispose();
 		}
 		Analytics.trackLevelPlay(mission.title, mission.path);
-		world = new MarbleWorld(scene, scene2d, mission, toRecord);
+		world = new MarbleWorld(scene, scene2d, mission, toRecord, multiplayer);
 		world.init();
 	}
 
diff --git a/src/MarbleWorld.hx b/src/MarbleWorld.hx
index 3ee07209..7e75f0d9 100644
--- a/src/MarbleWorld.hx
+++ b/src/MarbleWorld.hx
@@ -1,5 +1,9 @@
 package src;
 
+import net.NetCommands;
+import net.Net;
+import net.Net.ClientConnection;
+import rewind.InputRecorder;
 import gui.AchievementsGui;
 import src.Radar;
 import gui.LevelSelectGui;
@@ -105,7 +109,6 @@ class MarbleWorld extends Scheduler {
 
 	public var interiors:Array<InteriorObject> = [];
 	public var pathedInteriors:Array<PathedInterior> = [];
-	public var marbles:Array<Marble> = [];
 	public var dtsObjects:Array<DtsObject> = [];
 	public var forceObjects:Array<ForceObject> = [];
 	public var triggers:Array<Trigger> = [];
@@ -183,6 +186,18 @@ class MarbleWorld extends Scheduler {
 	public var rewindManager:RewindManager;
 	public var rewinding:Bool = false;
 
+	public var inputRecorder:InputRecorder;
+	public var isReplayingMovement:Bool = false;
+	public var currentInputMoves:Array<InputRecorderFrame>;
+
+	// Multiplayer
+	public var isMultiplayer:Bool;
+
+	public var startRealTime:Float = 0;
+	public var multiplayerStarted:Bool = false;
+
+	var clientMarbles:Map<ClientConnection, Marble> = [];
+
 	// Loading
 	var resourceLoadFuncs:Array<(() -> Void)->Void> = [];
 
@@ -207,7 +222,7 @@ class MarbleWorld extends Scheduler {
 
 	var lock:Bool = false;
 
-	public function new(scene:Scene, scene2d:h2d.Scene, mission:Mission, record:Bool = false) {
+	public function new(scene:Scene, scene2d:h2d.Scene, mission:Mission, record:Bool = false, multiplayer:Bool = false) {
 		this.scene = scene;
 		this.scene2d = scene2d;
 		this.mission = mission;
@@ -216,6 +231,17 @@ class MarbleWorld extends Scheduler {
 		this.replay = new Replay(mission.path, mission.isClaMission ? mission.id : 0);
 		this.isRecording = record;
 		this.rewindManager = new RewindManager(this);
+		this.inputRecorder = new InputRecorder(this);
+		this.isMultiplayer = multiplayer;
+
+		// Set the network RNG for hunt
+		if (isMultiplayer && gameMode is modes.HuntMode && Net.isHost) {
+			var hunt:modes.HuntMode = cast gameMode;
+			var rng = Math.random() * 10000;
+			NetCommands.setNetworkRNG(rng);
+			@:privateAccess hunt.rng.setSeed(cast rng);
+			@:privateAccess hunt.rng2.setSeed(cast rng);
+		}
 	}
 
 	public function init() {
@@ -266,7 +292,12 @@ class MarbleWorld extends Scheduler {
 		scanMission(this.mission.root);
 		this.gameMode.missionScan(this.mission);
 		this.resourceLoadFuncs.push(fwd -> this.initScene(fwd));
-		this.resourceLoadFuncs.push(fwd -> this.initMarble(fwd));
+		if (this.isMultiplayer) {
+			for (client in Net.clients) {
+				this.resourceLoadFuncs.push(fwd -> this.initMarble(client, fwd)); // Others
+			}
+		}
+		this.resourceLoadFuncs.push(fwd -> this.initMarble(null, fwd)); // Self
 		this.resourceLoadFuncs.push(fwd -> {
 			this.addSimGroup(this.mission.root);
 			this._loadingLength = resourceLoadFuncs.length;
@@ -371,7 +402,7 @@ class MarbleWorld extends Scheduler {
 		worker.run();
 	}
 
-	public function initMarble(onFinish:Void->Void) {
+	public function initMarble(client:ClientConnection, onFinish:Void->Void) {
 		Console.log("Initializing marble");
 		var worker = new ResourceLoaderWorker(onFinish);
 		var marblefiles = [
@@ -422,8 +453,9 @@ class MarbleWorld extends Scheduler {
 		}
 		worker.addTask(fwd -> {
 			var marble = new Marble();
-			marble.controllable = true;
-			this.addMarble(marble, fwd);
+			if (client == null)
+				marble.controllable = true;
+			this.addMarble(marble, client, fwd);
 		});
 		worker.run();
 	}
@@ -435,6 +467,8 @@ class MarbleWorld extends Scheduler {
 			interior.onLevelStart();
 		for (shape in this.dtsObjects)
 			shape.onLevelStart();
+		if (this.isMultiplayer && Net.isClient)
+			NetCommands.clientIsReady(Net.clientId);
 	}
 
 	public function restart(full:Bool = false) {
@@ -526,6 +560,15 @@ class MarbleWorld extends Scheduler {
 		this.marble.setMode(Start);
 		sky.follow = marble.camera;
 
+		if (isMultiplayer) {
+			for (client => marble in clientMarbles) {
+				var marbleStartQuat = this.gameMode.getSpawnTransform();
+				marble.setMarblePosition(marbleStartQuat.position.x, marbleStartQuat.position.y, marbleStartQuat.position.z);
+				marble.reset();
+				marble.setMode(Start);
+			}
+		}
+
 		var missionInfo:MissionElementScriptObject = cast this.mission.root.elements.filter((element) -> element._type == MissionElementType.ScriptObject
 			&& element._name == "MissionInfo")[0];
 		if (missionInfo.starthelptext != null)
@@ -585,17 +628,32 @@ class MarbleWorld extends Scheduler {
 		AudioManager.playSound(ResourceLoader.getResource('data/sound/spawn_alternate.wav', ResourceLoader.getAudio, this.soundResources));
 	}
 
+	public function allClientsReady() {
+		NetCommands.setStartTime(3); // Start after 3 seconds
+	}
+
 	public function updateGameState() {
 		if (this.outOfBounds)
 			return; // We will update state manually
-		if (this.timeState.currentAttemptTime < 0.5) {
-			this.marble.setMode(Start);
-		}
-		if ((this.timeState.currentAttemptTime >= 0.5) && (this.timeState.currentAttemptTime < 3.5)) {
-			this.marble.setMode(Start);
-		}
-		if (this.timeState.currentAttemptTime + skipStartBugPauseTime >= 3.5 && this.finishTime == null) {
-			this.marble.setMode(Play);
+		if (!this.isMultiplayer) {
+			if (this.timeState.currentAttemptTime < 0.5) {
+				this.marble.setMode(Start);
+			}
+			if ((this.timeState.currentAttemptTime >= 0.5) && (this.timeState.currentAttemptTime < 3.5)) {
+				this.marble.setMode(Start);
+			}
+			if (this.timeState.currentAttemptTime + skipStartBugPauseTime >= 3.5 && this.finishTime == null) {
+				this.marble.setMode(Play);
+			}
+		} else {
+			if (!this.multiplayerStarted) {
+				if (this.startRealTime != 0 && this.timeState.timeSinceLoad > this.startRealTime) {
+					this.multiplayerStarted = true;
+					this.marble.setMode(Play);
+					for (client => marble in this.clientMarbles)
+						marble.setMode(Play);
+				}
+			}
 		}
 	}
 
@@ -896,26 +954,46 @@ class MarbleWorld extends Scheduler {
 		});
 	}
 
-	public function addMarble(marble:Marble, onFinish:Void->Void) {
-		this.marbles.push(marble);
+	public function addMarble(marble:Marble, client:ClientConnection, onFinish:Void->Void) {
 		marble.level = cast this;
 		if (marble.controllable) {
-			marble.init(cast this, () -> {
+			marble.init(cast this, client, () -> {
 				this.scene.addChild(marble.camera);
 				this.marble = marble;
 				// Ugly hack
 				// sky.follow = marble;
 				sky.follow = marble.camera;
 				this.collisionWorld.addMovingEntity(marble.collider);
+				this.collisionWorld.addMarbleEntity(marble.collider);
 				this.scene.addChild(marble);
 				onFinish();
 			});
 		} else {
-			this.collisionWorld.addMovingEntity(marble.collider);
-			this.scene.addChild(marble);
+			marble.init(cast this, client, () -> {
+				marble.collisionWorld = this.collisionWorld;
+				this.collisionWorld.addMovingEntity(marble.collider);
+				this.collisionWorld.addMarbleEntity(marble.collider);
+				this.scene.addChild(marble);
+				if (client != null)
+					clientMarbles.set(client, marble);
+				onFinish();
+			});
 		}
 	}
 
+	public function addGhostMarble(onFinish:Marble->Void) {
+		var marb = new Marble();
+		marb.controllable = false;
+		marb.init(null, null, () -> {
+			marb.collisionWorld = this.collisionWorld;
+			this.collisionWorld.addMovingEntity(marb.collider);
+			this.collisionWorld.addMarbleEntity(marb.collider);
+			this.scene.addChild(marb);
+			onFinish(marb);
+		});
+		return marb;
+	}
+
 	public function performRestart() {
 		this.respawnPressedTime = timeState.timeSinceLoad;
 		this.restart();
@@ -934,11 +1012,53 @@ class MarbleWorld extends Scheduler {
 		}
 	}
 
+	public function rollback(t:Float) {
+		var newT = timeState.currentAttemptTime - t;
+		var rewindFrame = rewindManager.getNextRewindFrame(timeState.currentAttemptTime - t);
+		rewindManager.applyFrame(rewindFrame);
+		this.isReplayingMovement = true;
+		this.currentInputMoves = this.inputRecorder.getMovesFrom(timeState.currentAttemptTime);
+	}
+
+	public function advanceWorld(dt:Float) {
+		ProfilerUI.measure("updateTimer");
+		this.updateTimer(dt);
+		this.tickSchedule(timeState.currentAttemptTime);
+
+		if (Key.isDown(Settings.controlsSettings.blast)
+			|| (MarbleGame.instance.touchInput.blastbutton.pressed)
+			|| Gamepad.isDown(Settings.gamepadSettings.blast)
+			&& !this.isWatching
+			&& this.game == "ultra") {
+			this.marble.useBlast();
+		}
+
+		this.updateGameState();
+		this.updateBlast(timeState);
+		ProfilerUI.measure("updateDTS");
+		for (obj in dtsObjects) {
+			obj.update(timeState);
+		}
+		for (obj in triggers) {
+			obj.update(timeState);
+		}
+
+		ProfilerUI.measure("updateMarbles");
+		marble.update(timeState, collisionWorld, this.pathedInteriors);
+		for (client => marble in clientMarbles) {
+			marble.update(timeState, collisionWorld, this.pathedInteriors);
+		}
+	}
+
 	public function update(dt:Float) {
 		if (!_ready) {
 			return;
 		}
 
+		if (Key.isPressed(Key.T)) {
+			rollback(0.4);
+		}
+
 		var realDt = dt;
 
 		if ((Key.isDown(Settings.controlsSettings.rewind)
@@ -995,9 +1115,34 @@ class MarbleWorld extends Scheduler {
 				rewindManager.applyFrame(rframe);
 			}
 		}
+
 		if (dt < 0)
 			return;
 
+		if (this.isReplayingMovement) {
+			while (this.currentInputMoves.length > 1) {
+				while (this.currentInputMoves[1].time <= timeState.currentAttemptTime) {
+					this.currentInputMoves = this.currentInputMoves.slice(1);
+					if (this.currentInputMoves.length == 1)
+						break;
+				}
+				if (this.currentInputMoves.length > 1) {
+					dt = this.currentInputMoves[1].time - this.currentInputMoves[0].time;
+				}
+
+				if (this.isReplayingMovement) {
+					if (this.timeState.currentAttemptTime != this.currentInputMoves[0].time)
+						trace("fucked");
+				}
+
+				if (this.currentInputMoves.length > 1) {
+					advanceWorld(dt);
+					// trace('Position: ${@:privateAccess marble.newPos.sub(currentInputMoves[1].pos).length()}. Vel: ${marble.velocity.sub(currentInputMoves[1].velocity).length()}');
+				}
+			}
+			this.isReplayingMovement = false;
+		}
+
 		ProfilerUI.measure("updateTimer");
 		this.updateTimer(dt);
 
@@ -1056,8 +1201,14 @@ class MarbleWorld extends Scheduler {
 		for (obj in triggers) {
 			obj.update(timeState);
 		}
+
+		if (!isReplayingMovement) {
+			inputRecorder.recordInput(timeState.currentAttemptTime);
+		}
+
 		ProfilerUI.measure("updateMarbles");
-		for (marble in marbles) {
+		marble.update(timeState, collisionWorld, this.pathedInteriors);
+		for (client => marble in clientMarbles) {
 			marble.update(timeState, collisionWorld, this.pathedInteriors);
 		}
 		_cubemapNeedsUpdate = true;
@@ -1095,6 +1246,10 @@ class MarbleWorld extends Scheduler {
 		if (!this.rewinding && Settings.optionsSettings.rewindEnabled)
 			this.rewindManager.recordFrame();
 
+		if (!this.isReplayingMovement) {
+			inputRecorder.recordMarble();
+		}
+
 		this.updateTexts();
 	}
 
@@ -1176,7 +1331,8 @@ class MarbleWorld extends Scheduler {
 				if (this.timeState.gameplayClock < 0)
 					this.gameMode.onTimeExpire();
 			}
-			this.timeState.currentAttemptTime += dt;
+			if (!this.isMultiplayer || this.multiplayerStarted)
+				this.timeState.currentAttemptTime += dt;
 		} else {
 			this.timeState.currentAttemptTime = this.replay.currentPlaybackFrame.time;
 			this.timeState.gameplayClock = this.replay.currentPlaybackFrame.clockTime;
@@ -1833,10 +1989,10 @@ class MarbleWorld extends Scheduler {
 			pathedInteriors.dispose();
 		}
 		pathedInteriors = null;
-		for (marble in this.marbles) {
+		for (client => marble in clientMarbles) {
 			marble.dispose();
 		}
-		marbles = null;
+		clientMarbles = null;
 		for (dtsObject in this.dtsObjects) {
 			dtsObject.dispose();
 		}
diff --git a/src/PreviewWorld.hx b/src/PreviewWorld.hx
index d563d77d..9e37d326 100644
--- a/src/PreviewWorld.hx
+++ b/src/PreviewWorld.hx
@@ -582,7 +582,7 @@ class PreviewWorld extends Scheduler {
 	public function spawnMarble(onFinish:Marble->Void) {
 		var marb = new Marble();
 		marb.controllable = false;
-		marb.init(null, () -> {
+		marb.init(null, null, () -> {
 			marb.collisionWorld = this.collisionWorld;
 			this.collisionWorld.addMovingEntity(marb.collider);
 			this.scene.addChild(marb);
diff --git a/src/collision/CollisionWorld.hx b/src/collision/CollisionWorld.hx
index 28988fc0..c4fb0992 100644
--- a/src/collision/CollisionWorld.hx
+++ b/src/collision/CollisionWorld.hx
@@ -13,6 +13,8 @@ class CollisionWorld {
 	public var dynamicEntities:Array<CollisionEntity> = [];
 	public var dynamicOctree:Octree;
 
+	var marbleEntities:Array<SphereCollisionEntity> = [];
+
 	var dynamicEntitySet:Map<CollisionEntity, Bool> = [];
 
 	public function new() {
@@ -55,6 +57,13 @@ class CollisionWorld {
 					contacts = contacts.concat(obj.sphereIntersection(spherecollision, timeState));
 			}
 		}
+
+		for (marb in marbleEntities) {
+			if (marb != spherecollision) {
+				if (spherecollision.go.isCollideable)
+					contacts = contacts.concat(marb.sphereIntersection(spherecollision, timeState));
+			}
+		}
 		return {foundEntities: foundEntities, contacts: contacts};
 	}
 
@@ -114,6 +123,14 @@ class CollisionWorld {
 		// 	[entity.boundingBox.xSize, entity.boundingBox.ySize, entity.boundingBox.zSize], entity);
 	}
 
+	public function addMarbleEntity(entity:SphereCollisionEntity) {
+		this.marbleEntities.push(entity);
+	}
+
+	public function removeMarbleEntity(entity:SphereCollisionEntity) {
+		this.marbleEntities.remove(entity);
+	}
+
 	public function addMovingEntity(entity:CollisionEntity) {
 		this.dynamicEntities.push(entity);
 		this.dynamicOctree.insert(entity);
diff --git a/src/collision/SphereCollisionEntity.hx b/src/collision/SphereCollisionEntity.hx
index 5bb97230..4909a42f 100644
--- a/src/collision/SphereCollisionEntity.hx
+++ b/src/collision/SphereCollisionEntity.hx
@@ -98,17 +98,17 @@ class SphereCollisionEntity extends CollisionEntity {
 			contact.penetration = radius - (position.sub(contact.point).dot(contact.normal));
 			contacts.push(contact);
 
-			// var othercontact = new CollisionInfo();
-			// othercontact.collider = collisionEntity;
-			// othercontact.friction = 1;
-			// othercontact.restitution = 1;
-			// othercontact.velocity = this.velocity;
-			// othercontact.point = thispos.add(position).multiply(0.5);
-			// othercontact.normal = contact.point.sub(position).normalized();
-			// othercontact.contactDistance = contact.point.distance(position);
-			// othercontact.force = 0;
-			// othercontact.penetration = this.radius - (thispos.sub(othercontact.point).dot(othercontact.normal));
-			// this.marble.queueCollision(othercontact);
+			var othercontact = new CollisionInfo();
+			othercontact.collider = collisionEntity;
+			othercontact.friction = 1;
+			othercontact.restitution = 1;
+			othercontact.velocity = this.velocity;
+			othercontact.point = thispos.add(position).multiply(0.5);
+			othercontact.normal = contact.point.sub(position).normalized();
+			othercontact.contactDistance = contact.point.distance(position);
+			othercontact.force = 0;
+			othercontact.penetration = this.radius - (thispos.sub(othercontact.point).dot(othercontact.normal));
+			this.marble.queueCollision(othercontact);
 		}
 		return contacts;
 	}
diff --git a/src/gui/MainMenuGui.hx b/src/gui/MainMenuGui.hx
index 41e594aa..d6e804a8 100644
--- a/src/gui/MainMenuGui.hx
+++ b/src/gui/MainMenuGui.hx
@@ -71,6 +71,9 @@ class MainMenuGui extends GuiImage {
 		btnList.addButton(0, "Single Player Game", (sender) -> {
 			cast(this.parent, Canvas).setContent(new DifficultySelectGui());
 		});
+		btnList.addButton(0, "Multiplayer Game", (sender) -> {
+			cast(this.parent, Canvas).setContent(new MultiplayerGui());
+		});
 		// btnList.addButton(2, "Leaderboards", (e) -> {}, 20);
 		btnList.addButton(2, "Achievements", (e) -> {
 			cast(this.parent, Canvas).setContent(new AchievementsGui());
diff --git a/src/gui/MultiplayerGui.hx b/src/gui/MultiplayerGui.hx
new file mode 100644
index 00000000..27b5db3a
--- /dev/null
+++ b/src/gui/MultiplayerGui.hx
@@ -0,0 +1,106 @@
+package gui;
+
+import net.Net;
+import src.MarbleGame;
+import hxd.res.BitmapFont;
+import h3d.Vector;
+import src.ResourceLoader;
+import src.Settings;
+import src.Util;
+
+class MultiplayerGui extends GuiImage {
+	var innerCtrl:GuiControl;
+	var btnList:GuiXboxList;
+
+	public function new() {
+		var res = ResourceLoader.getImage("data/ui/xbox/BG_fadeOutSoftEdge.png").resource.toTile();
+		super(res);
+		var domcasual32fontdata = ResourceLoader.getFileEntry("data/font/DomCasualD.fnt");
+		var domcasual32b = new BitmapFont(domcasual32fontdata.entry);
+		@:privateAccess domcasual32b.loader = ResourceLoader.loader;
+		var domcasual32 = domcasual32b.toSdfFont(cast 42 * Settings.uiScale, MultiChannel);
+
+		this.horizSizing = Width;
+		this.vertSizing = Height;
+		this.position = new Vector();
+		this.extent = new Vector(640, 480);
+
+		#if hl
+		var scene2d = hxd.Window.getInstance();
+		#end
+		#if js
+		var scene2d = MarbleGame.instance.scene2d;
+		#end
+
+		var offsetX = (scene2d.width - 1280) / 2;
+		var offsetY = (scene2d.height - 720) / 2;
+
+		var subX = 640 - (scene2d.width - offsetX) * 640 / scene2d.width;
+		var subY = 480 - (scene2d.height - offsetY) * 480 / scene2d.height;
+
+		innerCtrl = new GuiControl();
+		innerCtrl.position = new Vector(offsetX, offsetY);
+		innerCtrl.extent = new Vector(640 - subX, 480 - subY);
+		innerCtrl.horizSizing = Width;
+		innerCtrl.vertSizing = Height;
+		this.addChild(innerCtrl);
+
+		var coliseumfontdata = ResourceLoader.getFileEntry("data/font/ColiseumRR.fnt");
+		var coliseumb = new BitmapFont(coliseumfontdata.entry);
+		@:privateAccess coliseumb.loader = ResourceLoader.loader;
+		var coliseum = coliseumb.toSdfFont(cast 44 * Settings.uiScale, MultiChannel);
+
+		var rootTitle = new GuiText(coliseum);
+		rootTitle.position = new Vector(100, 30);
+		rootTitle.extent = new Vector(1120, 80);
+		rootTitle.text.textColor = 0xFFFFFF;
+		rootTitle.text.text = "MULTIPLAYER";
+		rootTitle.text.alpha = 0.5;
+		innerCtrl.addChild(rootTitle);
+
+		var btnList = new GuiXboxList();
+		btnList.position = new Vector(70 - offsetX, 165);
+		btnList.horizSizing = Left;
+		btnList.extent = new Vector(502, 500);
+		innerCtrl.addChild(btnList);
+
+		btnList.addButton(3, 'Create Game', (e) -> {
+			MarbleGame.canvas.setContent(new MultiplayerLevelSelectGui(true));
+			Net.hostServer();
+		});
+
+		btnList.addButton(3, 'Join Game', (e) -> {
+			Net.joinServer(() -> {
+				MarbleGame.canvas.setContent(new MultiplayerLevelSelectGui(false));
+			});
+		});
+
+		var bottomBar = new GuiControl();
+		bottomBar.position = new Vector(0, 590);
+		bottomBar.extent = new Vector(640, 200);
+		bottomBar.horizSizing = Width;
+		bottomBar.vertSizing = Bottom;
+		innerCtrl.addChild(bottomBar);
+
+		var backButton = new GuiXboxButton("Back", 160);
+		backButton.position = new Vector(400, 0);
+		backButton.vertSizing = Bottom;
+		backButton.horizSizing = Right;
+		backButton.gamepadAccelerator = ["B"];
+		backButton.accelerators = [hxd.Key.ESCAPE, hxd.Key.BACKSPACE];
+		backButton.pressedAction = (e) -> MarbleGame.canvas.setContent(new MainMenuGui());
+		bottomBar.addChild(backButton);
+	}
+
+	override function onResize(width:Int, height:Int) {
+		var offsetX = (width - 1280) / 2;
+		var offsetY = (height - 720) / 2;
+
+		var subX = 640 - (width - offsetX) * 640 / width;
+		var subY = 480 - (height - offsetY) * 480 / height;
+		innerCtrl.position = new Vector(offsetX, offsetY);
+		innerCtrl.extent = new Vector(640 - subX, 480 - subY);
+
+		super.onResize(width, height);
+	}
+}
diff --git a/src/gui/MultiplayerLevelSelectGui.hx b/src/gui/MultiplayerLevelSelectGui.hx
new file mode 100644
index 00000000..6dec7aef
--- /dev/null
+++ b/src/gui/MultiplayerLevelSelectGui.hx
@@ -0,0 +1,298 @@
+package gui;
+
+import net.NetCommands;
+import modes.GameMode.ScoreType;
+import src.Util;
+import haxe.io.Path;
+import h2d.filter.DropShadow;
+import src.MarbleGame;
+import gui.GuiControl.MouseState;
+import hxd.res.BitmapFont;
+import h3d.Vector;
+import src.ResourceLoader;
+import src.Settings;
+import src.MissionList;
+
+class MultiplayerLevelSelectGui extends GuiImage {
+	static var currentSelectionStatic:Int = 0;
+
+	static var setLevelFn:Int->Void;
+	static var playSelectedLevel:Void->Void;
+
+	var innerCtrl:GuiControl;
+
+	public function new(isHost:Bool) {
+		var res = ResourceLoader.getImage("data/ui/game/CloudBG.jpg").resource.toTile();
+		super(res);
+
+		var arial14fontdata = ResourceLoader.getFileEntry("data/font/Arial Bold.fnt");
+		var arial14b = new BitmapFont(arial14fontdata.entry);
+		@:privateAccess arial14b.loader = ResourceLoader.loader;
+		var arial14 = arial14b.toSdfFont(cast 21 * Settings.uiScale, h2d.Font.SDFChannel.MultiChannel);
+		function mlFontLoader(text:String) {
+			return arial14;
+		}
+
+		MarbleGame.instance.toRecord = false;
+
+		var fadeEdge = new GuiImage(ResourceLoader.getResource("data/ui/xbox/BG_fadeOutSoftEdge.png", ResourceLoader.getImage, this.imageResources).toTile());
+		fadeEdge.position = new Vector(0, 0);
+		fadeEdge.extent = new Vector(640, 480);
+		fadeEdge.vertSizing = Height;
+		fadeEdge.horizSizing = Width;
+		this.addChild(fadeEdge);
+
+		var loadAnim = new GuiLoadAnim();
+		loadAnim.position = new Vector(610, 253);
+		loadAnim.extent = new Vector(63, 63);
+		loadAnim.horizSizing = Center;
+		loadAnim.vertSizing = Bottom;
+		this.addChild(loadAnim);
+
+		var loadTextBg = new GuiText(arial14);
+		loadTextBg.position = new Vector(608, 335);
+		loadTextBg.extent = new Vector(63, 40);
+		loadTextBg.horizSizing = Center;
+		loadTextBg.vertSizing = Bottom;
+		loadTextBg.justify = Center;
+		loadTextBg.text.text = "Loading";
+		loadTextBg.text.textColor = 0;
+		this.addChild(loadTextBg);
+
+		var loadText = new GuiText(arial14);
+		loadText.position = new Vector(610, 334);
+		loadText.extent = new Vector(63, 40);
+		loadText.horizSizing = Center;
+		loadText.vertSizing = Bottom;
+		loadText.justify = Center;
+		loadText.text.text = "Loading";
+		this.addChild(loadText);
+
+		var difficultyMissions = MissionList.missionList['ultra']["multiplayer"];
+		if (currentSelectionStatic >= difficultyMissions.length)
+			currentSelectionStatic = 0;
+		var curMission = difficultyMissions[currentSelectionStatic];
+
+		var lock = true;
+		var currentToken = 0;
+		var requestToken = 0;
+
+		// var misFile = Path.withoutExtension(Path.withoutDirectory(curMission.path));
+		// MarbleGame.instance.setPreviewMission(misFile, () -> {
+		// 	lock = false;
+		// 	if (currentToken != requestToken)
+		// 		return;
+		// 	this.bmp.visible = false;
+		// 	loadAnim.anim.visible = false;
+		// 	loadText.text.visible = false;
+		// 	loadTextBg.text.visible = false;
+		// });
+
+		var domcasual32fontdata = ResourceLoader.getFileEntry("data/font/DomCasualD.fnt");
+		var domcasual32b = new BitmapFont(domcasual32fontdata.entry);
+		@:privateAccess domcasual32b.loader = ResourceLoader.loader;
+		var domcasual32 = domcasual32b.toSdfFont(cast 42 * Settings.uiScale, MultiChannel);
+
+		this.horizSizing = Width;
+		this.vertSizing = Height;
+		this.position = new Vector();
+		this.extent = new Vector(640, 480);
+		#if hl
+		var scene2d = hxd.Window.getInstance();
+		#end
+		#if js
+		var scene2d = MarbleGame.instance.scene2d;
+		#end
+
+		var offsetX = (scene2d.width - 1280) / 2;
+		var offsetY = (scene2d.height - 720) / 2;
+
+		var subX = 640 - (scene2d.width - offsetX) * 640 / scene2d.width;
+		var subY = 480 - (scene2d.height - offsetY) * 480 / scene2d.height;
+
+		innerCtrl = new GuiControl();
+
+		innerCtrl.position = new Vector(offsetX, offsetY);
+		innerCtrl.extent = new Vector(640 - subX, 480 - subY);
+		innerCtrl.horizSizing = Width;
+		innerCtrl.vertSizing = Height;
+		this.addChild(innerCtrl);
+		var coliseumfontdata = ResourceLoader.getFileEntry("data/font/ColiseumRR.fnt");
+		var coliseumb = new BitmapFont(coliseumfontdata.entry);
+		@:privateAccess coliseumb.loader = ResourceLoader.loader;
+		var coliseum = coliseumb.toSdfFont(cast 44 * Settings.uiScale, MultiChannel);
+
+		var rootTitle = new GuiText(coliseum);
+
+		rootTitle.position = new Vector(100, 30);
+		rootTitle.extent = new Vector(1120, 80);
+		rootTitle.text.textColor = 0xFFFFFF;
+		rootTitle.text.text = "SELECT LEVEL";
+		rootTitle.text.alpha = 0.5;
+		innerCtrl.addChild(rootTitle);
+		var bottomBar = new GuiControl();
+
+		bottomBar.position = new Vector(0, 590);
+		bottomBar.extent = new Vector(640, 200);
+		bottomBar.horizSizing = Width;
+		bottomBar.vertSizing = Bottom;
+		innerCtrl.addChild(bottomBar);
+
+		var backButton = new GuiXboxButton("Back", 160);
+		backButton.position = new Vector(400, 0);
+		backButton.vertSizing = Bottom;
+		backButton.horizSizing = Right;
+		backButton.gamepadAccelerator = ["B"];
+		backButton.accelerators = [hxd.Key.ESCAPE, hxd.Key.BACKSPACE];
+		backButton.pressedAction = (e) -> MarbleGame.canvas.setContent(new DifficultySelectGui());
+		bottomBar.addChild(backButton);
+
+		// var lbButton = new GuiXboxButton("Leaderboard", 220);
+		// lbButton.position = new Vector(750, 0);
+		// lbButton.vertSizing = Bottom;
+		// lbButton.horizSizing = Right;
+		// bottomBar.addChild(lbButton);
+
+		if (isHost) {
+			var nextButton = new GuiXboxButton("Play", 160);
+			nextButton.position = new Vector(960, 0);
+			nextButton.vertSizing = Bottom;
+			nextButton.horizSizing = Right;
+			nextButton.gamepadAccelerator = ["A"];
+			nextButton.accelerators = [hxd.Key.ENTER];
+			nextButton.pressedAction = (e) -> {
+				NetCommands.playLevel();
+			};
+			bottomBar.addChild(nextButton);
+		}
+		playSelectedLevel = () -> {
+			MarbleGame.instance.playMission(curMission, true);
+		}
+
+		var levelWnd = new GuiImage(ResourceLoader.getResource("data/ui/xbox/levelPreviewWindow.png", ResourceLoader.getImage, this.imageResources).toTile());
+		levelWnd.position = new Vector(555, 469);
+		levelWnd.extent = new Vector(535, 137);
+		levelWnd.vertSizing = Bottom;
+		levelWnd.horizSizing = Right;
+		innerCtrl.addChild(levelWnd);
+
+		var statIcon = new GuiImage(ResourceLoader.getResource("data/ui/xbox/statIcon.png", ResourceLoader.getImage, this.imageResources).toTile());
+		statIcon.position = new Vector(29, 54);
+		statIcon.extent = new Vector(20, 20);
+		levelWnd.addChild(statIcon);
+
+		var eggIcon = new GuiImage(ResourceLoader.getResource("data/ui/xbox/eggIcon.png", ResourceLoader.getImage, this.imageResources).toTile());
+		eggIcon.position = new Vector(29, 79);
+		eggIcon.extent = new Vector(20, 20);
+		levelWnd.addChild(eggIcon);
+
+		var c0 = 0xEBEBEB;
+		var c1 = 0x8DFF8D;
+		var c2 = 0x88BCEE;
+		var c3 = 0xFF7575;
+
+		var levelInfoLeft = new GuiMLText(arial14, mlFontLoader);
+		levelInfoLeft.position = new Vector(69, 54);
+		levelInfoLeft.extent = new Vector(180, 100);
+		levelInfoLeft.text.text = '<p align="right"><font color="#EBEBEB">My Best Time:</font><br/><font color="#EBEBEB">Par Time:</font></p>';
+		levelInfoLeft.text.lineSpacing = 6;
+		levelWnd.addChild(levelInfoLeft);
+
+		var levelInfoMid = new GuiMLText(arial14, mlFontLoader);
+		levelInfoMid.position = new Vector(269, 54);
+		levelInfoMid.extent = new Vector(180, 100);
+		levelInfoMid.text.text = '<p align="left"><font color="#EBEBEB">None</font><br/><font color="#88BCEE">99:59:99</font></p>';
+		levelInfoMid.text.lineSpacing = 6;
+		levelWnd.addChild(levelInfoMid);
+
+		var levelInfoRight = new GuiMLText(arial14, mlFontLoader);
+		levelInfoRight.position = new Vector(379, 54);
+		levelInfoRight.extent = new Vector(180, 100);
+		levelInfoRight.text.text = '<p align="left"><font color="#EBEBEB">Level 1<br/>Difficulty 1</font></p>';
+		levelInfoRight.text.lineSpacing = 6;
+		levelWnd.addChild(levelInfoRight);
+
+		var levelNames = difficultyMissions.map(x -> x.title);
+		var levelSelectOpts = new GuiXboxOptionsList(6, "Level", levelNames);
+
+		function setLevel(idx:Int) {
+			// if (lock)
+			//	return false;
+			levelSelectOpts.currentOption = idx;
+			this.bmp.visible = true;
+			loadAnim.anim.visible = true;
+			loadText.text.visible = true;
+			loadTextBg.text.visible = true;
+			lock = true;
+			curMission = difficultyMissions[idx];
+			currentSelectionStatic = idx;
+			currentToken++;
+			var misFile = Path.withoutExtension(Path.withoutDirectory(curMission.path));
+			var mis = difficultyMissions[idx];
+			var requestToken = currentToken;
+			if (Settings.easterEggs.exists(mis.path))
+				eggIcon.bmp.visible = true;
+			else
+				eggIcon.bmp.visible = false;
+			MarbleGame.instance.setPreviewMission(misFile, () -> {
+				lock = false;
+				if (requestToken != currentToken)
+					return;
+				this.bmp.visible = false;
+				loadAnim.anim.visible = false;
+				loadText.text.visible = false;
+				loadTextBg.text.visible = false;
+			});
+
+			var scoreType = mis.missionInfo.gamemode != null
+				&& mis.missionInfo.gamemode.toLowerCase() == 'scrum' ? ScoreType.Score : ScoreType.Time;
+
+			var myScore = Settings.getScores(mis.path);
+			var scoreDisp = "None";
+			if (myScore.length != 0)
+				scoreDisp = scoreType == Time ? Util.formatTime(myScore[0].time) : Util.formatScore(myScore[0].time);
+			var isPar = myScore.length != 0 && myScore[0].time < mis.qualifyTime;
+			var scoreColor = "#EBEBEB";
+			if (isPar)
+				scoreColor = "#8DFF8D";
+			if (scoreType == Score && myScore.length == 0)
+				scoreColor = "#EBEBEB";
+			if (scoreType == Time) {
+				levelInfoLeft.text.text = '<p align="right"><font color="#EBEBEB">My Best Time:</font><br/><font color="#EBEBEB">Par Time:</font></p>';
+				levelInfoMid.text.text = '<p align="left"><font color="${scoreColor}">${scoreDisp}</font><br/><font color="#88BCEE">${Util.formatTime(mis.qualifyTime)}</font></p>';
+			}
+			if (scoreType == Score) {
+				levelInfoLeft.text.text = '<p align="right"><font color="#EBEBEB">My Best Score:</font></p>';
+				levelInfoMid.text.text = '<p align="left"><font color="${scoreColor}">${scoreDisp}</font></p>';
+			}
+			levelInfoRight.text.text = '<p align="left"><font color="#EBEBEB">Level ${mis.missionInfo.level}<br/>Difficulty ${mis.missionInfo.difficulty == null ? "" : mis.missionInfo.difficulty}</font></p>';
+			return true;
+		}
+		setLevelFn = setLevel;
+
+		levelSelectOpts.position = new Vector(380, 435);
+		levelSelectOpts.extent = new Vector(815, 94);
+		levelSelectOpts.vertSizing = Bottom;
+		levelSelectOpts.horizSizing = Right;
+		levelSelectOpts.alwaysActive = true;
+		levelSelectOpts.onChangeFunc = (i) -> {
+			NetCommands.setLobbyLevelIndex(i);
+			return true;
+		};
+		levelSelectOpts.setCurrentOption(currentSelectionStatic);
+		setLevel(currentSelectionStatic);
+		innerCtrl.addChild(levelSelectOpts);
+	}
+
+	override function onResize(width:Int, height:Int) {
+		var offsetX = (width - 1280) / 2;
+		var offsetY = (height - 720) / 2;
+
+		var subX = 640 - (width - offsetX) * 640 / width;
+		var subY = 480 - (height - offsetY) * 480 / height;
+		innerCtrl.position = new Vector(offsetX, offsetY);
+		innerCtrl.extent = new Vector(640 - subX, 480 - subY);
+
+		super.onResize(width, height);
+	}
+}
diff --git a/src/net/Net.hx b/src/net/Net.hx
new file mode 100644
index 00000000..e4a52483
--- /dev/null
+++ b/src/net/Net.hx
@@ -0,0 +1,244 @@
+package net;
+
+import haxe.Json;
+import datachannel.RTCPeerConnection;
+import datachannel.RTCDataChannel;
+import hx.ws.WebSocket;
+import src.Console;
+import net.NetCommands;
+
+enum abstract GameplayState(Int) from Int to Int {
+	var UNKNOWN;
+	var LOBBY;
+	var GAME;
+}
+
+enum abstract NetPacketType(Int) from Int to Int {
+	var NullPacket;
+	var ClientIdAssign;
+	var NetCommand;
+	var Ping;
+	var PingBack;
+}
+
+@:publicFields
+class ClientConnection {
+	var id:Int;
+	var socket:RTCPeerConnection;
+	var datachannel:RTCDataChannel;
+	var state:GameplayState;
+	var rtt:Float;
+	var pingSendTime:Float;
+	var _rttRecords:Array<Float> = [];
+
+	public function new(id:Int, socket:RTCPeerConnection, datachannel:RTCDataChannel) {
+		this.socket = socket;
+		this.datachannel = datachannel;
+		this.id = id;
+		this.state = GameplayState.LOBBY;
+		this.rtt = 0;
+	}
+
+	public function ready() {
+		state = GameplayState.GAME;
+	}
+}
+
+class Net {
+	static var client:RTCPeerConnection;
+	static var clientDatachannel:RTCDataChannel;
+
+	static var masterWs:WebSocket;
+
+	public static var isMP:Bool;
+	public static var isHost:Bool;
+	public static var isClient:Bool;
+
+	public static var startMP:Bool;
+
+	public static var clientId:Int;
+	public static var networkRNG:Float;
+	public static var clients:Map<RTCPeerConnection, ClientConnection> = [];
+	public static var clientIdMap:Map<Int, ClientConnection> = [];
+
+	public static function hostServer() {
+		// host = new RTCPeerConnection(["stun.l.google.com:19302"], "0.0.0.0");
+		// host.bind("127.0.0.1", 28000, (c) -> {
+		// 	onClientConnect(c);
+		// 	isMP = true;
+		// });
+		isHost = true;
+		isClient = false;
+		clientId = 0;
+		masterWs = new WebSocket("ws://localhost:8080");
+
+		masterWs.onmessage = (m) -> {
+			switch (m) {
+				case StrMessage(content):
+					var conts = Json.parse(content);
+					var peer = new RTCPeerConnection(["stun.l.google.com:19302"], "0.0.0.0");
+					peer.setRemoteDescription(conts.sdp, conts.type);
+
+					var candidates = [];
+					peer.onLocalCandidate = (c) -> {
+						if (c != "")
+							candidates.push('a=${c}');
+					}
+					peer.onGatheringStateChange = (s) -> {
+						if (s == RTC_GATHERING_COMPLETE) {
+							var sdpObj = StringTools.trim(peer.localDescription);
+							sdpObj = sdpObj + '\r\n' + candidates.join('\r\n');
+							masterWs.send(Json.stringify({
+								type: "connect",
+								sdpObj: {
+									sdp: sdpObj,
+									type: "offer"
+								}
+							}));
+						}
+					}
+					peer.onDataChannel = (dc) -> {
+						onClientConnect(peer, dc);
+					};
+				case _: {}
+			}
+		}
+
+		isMP = true;
+	}
+
+	public static function joinServer(connectedCb:() -> Void) {
+		masterWs = new WebSocket("ws://localhost:8080");
+
+		client = new RTCPeerConnection(["stun.l.google.com:19302"], "0.0.0.0");
+		var candidates = [];
+
+		client.onLocalCandidate = (c) -> {
+			if (c != "")
+				candidates.push('a=${c}');
+		}
+		client.onGatheringStateChange = (s) -> {
+			if (s == RTC_GATHERING_COMPLETE) {
+				var sdpObj = StringTools.trim(client.localDescription);
+				sdpObj = sdpObj + '\r\n' + candidates.join('\r\n');
+				masterWs.send(Json.stringify({
+					type: "connect",
+					sdpObj: {
+						sdp: sdpObj,
+						type: "offer"
+					}
+				}));
+			}
+		}
+
+		masterWs.onmessage = (m) -> {
+			switch (m) {
+				case StrMessage(content):
+					var conts = Json.parse(content);
+					client.setRemoteDescription(conts.sdp, conts.type);
+				case _: {}
+			}
+		}
+
+		clientDatachannel = client.createDatachannel("mp");
+		clientDatachannel.onOpen = (n) -> {
+			clients.set(client, new ClientConnection(0, client, clientDatachannel)); // host is always 0
+			clientIdMap[0] = clients[client];
+			onConnectedToServer();
+			haxe.Timer.delay(() -> connectedCb(), 1500); // 1.5 second delay to do the RTT calculation
+		}
+		clientDatachannel.onMessage = (b) -> {
+			onPacketReceived(client, clientDatachannel, new haxe.io.BytesInput(b));
+		}
+
+		isMP = true;
+		isHost = false;
+		isClient = true;
+	}
+
+	static function onClientConnect(c:RTCPeerConnection, dc:RTCDataChannel) {
+		clientId += 1;
+		clients.set(c, new ClientConnection(clientId, c, dc));
+		clientIdMap[clientId] = clients[c];
+		dc.onMessage = (msgBytes) -> {
+			onPacketReceived(c, dc, new haxe.io.BytesInput(msgBytes));
+		}
+		var b = haxe.io.Bytes.alloc(3);
+		b.set(0, ClientIdAssign);
+		b.setUInt16(1, clientId);
+		dc.sendBytes(b);
+		Console.log("Client has connected!");
+		// Send the ping packet to calculcate the RTT
+		var b = haxe.io.Bytes.alloc(2);
+		b.set(0, Ping);
+		b.set(1, 3); // Count
+		clients[c].pingSendTime = Sys.time();
+		dc.sendBytes(b);
+		Console.log("Sending ping packet!");
+	}
+
+	static function onConnectedToServer() {
+		Console.log("Connected to the server!");
+		// Send the ping packet to calculate the RTT
+		var b = haxe.io.Bytes.alloc(2);
+		b.set(0, Ping);
+		b.set(1, 3); // Count
+		clients[client].pingSendTime = Sys.time();
+		clientDatachannel.sendBytes(b);
+		Console.log("Sending ping packet!");
+	}
+
+	static function onPacketReceived(c:RTCPeerConnection, dc:RTCDataChannel, input:haxe.io.BytesInput) {
+		var packetType = input.readByte();
+		switch (packetType) {
+			case NetCommand:
+				NetCommands.readPacket(input);
+
+			case ClientIdAssign:
+				clientId = input.readUInt16();
+				Console.log('Client ID set to ${clientId}');
+
+			case Ping:
+				var pingLeft = input.readByte();
+				Console.log("Got ping packet!");
+				var b = haxe.io.Bytes.alloc(2);
+				b.set(0, PingBack);
+				b.set(1, pingLeft);
+				dc.sendBytes(b);
+
+			case PingBack:
+				var pingLeft = input.readByte();
+				Console.log("Got pingback packet!");
+				var conn = clients[c];
+				var now = Sys.time();
+				conn._rttRecords.push((now - conn.pingSendTime));
+				if (pingLeft > 0) {
+					conn.pingSendTime = now;
+					var b = haxe.io.Bytes.alloc(2);
+					b.set(0, Ping);
+					b.set(1, pingLeft - 1);
+					dc.sendBytes(b);
+				} else {
+					for (r in conn._rttRecords)
+						conn.rtt += r;
+					conn.rtt /= conn._rttRecords.length;
+					Console.log('Got RTT ${conn.rtt} for client ${conn.id}');
+				}
+
+			case _:
+				trace("unknown command: " + packetType);
+		}
+	}
+
+	public static function sendPacketToAll(packetData:haxe.io.BytesOutput) {
+		var bytes = packetData.getBytes();
+		for (c => v in clients) {
+			v.datachannel.sendBytes(packetData.getBytes());
+		}
+	}
+
+	public static function sendPacketToHost(packetData:haxe.io.BytesOutput) {
+		var bytes = packetData.getBytes();
+		clientDatachannel.sendBytes(bytes);
+	}
+}
diff --git a/src/net/NetCommands.hx b/src/net/NetCommands.hx
new file mode 100644
index 00000000..fa679fc7
--- /dev/null
+++ b/src/net/NetCommands.hx
@@ -0,0 +1,54 @@
+package net;
+
+import net.Net.GameplayState;
+import net.Net.NetPacketType;
+import gui.MultiplayerLevelSelectGui;
+import src.MarbleGame;
+
+@:build(net.RPCMacro.build())
+class NetCommands {
+	@:rpc(server) public static function setLobbyLevelIndex(i:Int) {
+		MultiplayerLevelSelectGui.setLevelFn(i);
+	}
+
+	@:rpc(server) public static function playLevel() {
+		MultiplayerLevelSelectGui.playSelectedLevel();
+	}
+
+	@:rpc(server) public static function setNetworkRNG(rng:Float) {
+		Net.networkRNG = rng;
+		if (MarbleGame.instance.world != null) {
+			var gameMode = MarbleGame.instance.world.gameMode;
+			if (gameMode is modes.HuntMode) {
+				var hunt:modes.HuntMode = cast gameMode;
+				@:privateAccess hunt.rng.setSeed(cast rng);
+				@:privateAccess hunt.rng2.setSeed(cast rng);
+			}
+		}
+	}
+
+	@:rpc(client) public static function clientIsReady(clientId:Int) {
+		if (Net.isHost) {
+			Net.clientIdMap[clientId].ready();
+			var allReady = true;
+			for (id => client in Net.clientIdMap) {
+				if (client.state != GameplayState.GAME)
+					allReady = false;
+			}
+			if (allReady) {
+				if (MarbleGame.instance.world != null) {
+					MarbleGame.instance.world.allClientsReady();
+				}
+			}
+		}
+	}
+
+	@:rpc(server) public static function setStartTime(t:Float) {
+		if (MarbleGame.instance.world != null) {
+			if (Net.isClient) {
+				t -= Net.clientIdMap[0].rtt / 2; // Subtract receving time
+			}
+			MarbleGame.instance.world.startRealTime = MarbleGame.instance.world.timeState.timeSinceLoad + t;
+		}
+	}
+}
diff --git a/src/net/RPCMacro.hx b/src/net/RPCMacro.hx
new file mode 100644
index 00000000..8bc19a42
--- /dev/null
+++ b/src/net/RPCMacro.hx
@@ -0,0 +1,136 @@
+package net;
+
+import haxe.macro.Context;
+import haxe.macro.Expr;
+
+class RPCMacro {
+	macro static public function build():Array<Field> {
+		var fields = Context.getBuildFields();
+
+		var rpcFnId = 1;
+
+		var idtoFn:Map<Int, {
+			name:String,
+			serialize:Array<Expr>,
+			deserialize:Array<Expr>
+		}> = new Map();
+
+		for (field in fields) {
+			if (field.meta.length > 0 && field.meta[0].name == ':rpc') {
+				switch (field.kind) {
+					case FFun(f):
+						{
+							var serializeFns = [];
+							var deserializeFns = [];
+							var callExprs = [];
+							for (arg in f.args) {
+								var argName = arg.name;
+								switch (arg.type) {
+									case TPath({
+										name: 'Int'
+									}): {
+										deserializeFns.push(macro var $argName = stream.readInt32());
+										callExprs.push(macro $i{argName});
+										serializeFns.push(macro stream.writeInt32($i{argName}));
+									}
+
+									case TPath({
+										name: 'Float'
+									}): {
+										deserializeFns.push(macro var $argName = stream.readFloat());
+										callExprs.push(macro $i{argName});
+										serializeFns.push(macro stream.writeFloat($i{argName}));
+									}
+
+									case _: {}
+								}
+							}
+							deserializeFns.push(macro {
+								$i{field.name}($a{callExprs});
+							});
+							idtoFn.set(rpcFnId, {
+								name: field.name,
+								serialize: serializeFns,
+								deserialize: deserializeFns
+							});
+
+							var directionParam = field.meta[0].params[0].expr;
+							switch (directionParam) {
+								case EConst(CIdent("server")):
+									var lastExpr = macro {
+										if (Net.isHost) {
+											var stream = new haxe.io.BytesOutput();
+											stream.writeByte(NetPacketType.NetCommand);
+											stream.writeByte($v{rpcFnId});
+											$b{serializeFns};
+											Net.sendPacketToAll(stream);
+										}
+									};
+
+									f.expr = macro $b{[f.expr, lastExpr]};
+
+								case EConst(CIdent("client")):
+									var lastExpr = macro {
+										if (!Net.isHost) {
+											var stream = new haxe.io.BytesOutput();
+											stream.writeByte(NetPacketType.NetCommand);
+											stream.writeByte($v{rpcFnId});
+											$b{serializeFns};
+											Net.sendPacketToHost(stream);
+										}
+									};
+
+									f.expr = macro $b{[f.expr, lastExpr]};
+
+								case _:
+									{}
+							}
+
+							rpcFnId++;
+						}
+
+					case _:
+						{}
+				}
+			}
+		}
+
+		var cases:Array<Case> = [];
+		for (k => v in idtoFn) {
+			cases.push({
+				values: [macro $v{k}],
+				expr: macro {
+					$b{v.deserialize}
+				}
+			});
+		}
+
+		var deserializeField:Field = {
+			name: "readPacket",
+			pos: Context.currentPos(),
+			access: [APublic, AStatic],
+			kind: FFun({
+				args: [
+					{
+						name: "stream",
+						type: haxe.macro.TypeTools.toComplexType(Context.getType('haxe.io.Input'))
+					}
+				],
+				expr: macro {
+					var fnId = stream.readByte();
+
+					$e{
+						{
+							expr: ESwitch(macro fnId, cases, null),
+							pos: Context.currentPos()
+						}
+					}
+				}
+			})
+		};
+
+		fields.push(deserializeField);
+
+		return fields;
+	}
+}
diff --git a/src/rewind/InputRecorder.hx b/src/rewind/InputRecorder.hx
new file mode 100644
index 00000000..3078cc1c
--- /dev/null
+++ b/src/rewind/InputRecorder.hx
@@ -0,0 +1,62 @@
+package rewind;
+
+import src.MarbleWorld;
+import h3d.Vector;
+import src.Marble.Move;
+
+@:publicFields
+class InputRecorderFrame {
+	var time:Float;
+	var move:Move;
+	var marbleAxes:Array<Vector>;
+	var pos:Vector;
+	var velocity:Vector;
+
+	public function new() {}
+}
+
+class InputRecorder {
+	var frames:Array<InputRecorderFrame>;
+	var level:MarbleWorld;
+
+	public function new(level:MarbleWorld) {
+		frames = [];
+		this.level = level;
+	}
+
+	public function recordInput(t:Float) {
+		var frame = new InputRecorderFrame();
+		frame.time = t;
+		frame.move = level.marble.recordMove();
+		frames.push(frame);
+	}
+
+	public function recordMarble() {
+		frames[frames.length - 1].pos = @:privateAccess level.marble.newPos?.clone();
+		frames[frames.length - 1].velocity = level.marble.velocity.clone();
+	}
+
+	public function recordAxis(axis:Array<Vector>) {
+		frames[frames.length - 1].marbleAxes = axis.copy();
+	}
+
+	public function getMovesFrom(t:Float) {
+		if (frames.length == 0)
+			return [];
+		var start = 0;
+		var end = frames.length - 1;
+		var mid = Std.int(frames.length / 2);
+		while (end - start > 1) {
+			mid = Std.int((start / 2) + (end / 2));
+			if (frames[mid].time < t) {
+				start = mid + 1;
+			} else if (frames[mid].time > t) {
+				end = mid - 1;
+			} else {
+				start = end = mid;
+			}
+		}
+
+		return frames.slice(start - 1);
+	}
+}