diff --git a/src/d_player.h b/src/d_player.h
index 7d0f20058..ad7b75b86 100644
--- a/src/d_player.h
+++ b/src/d_player.h
@@ -590,6 +590,8 @@ typedef struct player_s
 
 	UINT8 shrinkLaserDelay;
 
+	mobj_t *stumbleIndicator;
+
 #ifdef HWRENDER
 	fixed_t fovadd; // adjust FOV for hw rendering
 #endif
diff --git a/src/deh_tables.c b/src/deh_tables.c
index 37ec83b7f..7f293daa3 100644
--- a/src/deh_tables.c
+++ b/src/deh_tables.c
@@ -3837,6 +3837,8 @@ const char *const STATE_LIST[] = { // array length left dynamic for sanity testi
 	"S_TRIPWIREBOOST_BLAST_TOP",
 	"S_TRIPWIREBOOST_BLAST_BOTTOM",
 
+	"S_SMOOTHLANDING",
+
 	// DEZ respawn laser
 	"S_DEZLASER",
 	"S_DEZLASER_TRAIL1",
@@ -5383,6 +5385,8 @@ const char *const MOBJTYPE_LIST[] = {  // array length left dynamic for sanity t
 
 	"MT_TRIPWIREBOOST",
 
+	"MT_SMOOTHLANDING",
+
 	"MT_DEZLASER",
 
 	"MT_WAYPOINT",
diff --git a/src/info.c b/src/info.c
index 6fac31311..c14582b98 100644
--- a/src/info.c
+++ b/src/info.c
@@ -588,6 +588,7 @@ char sprnames[NUMSPRITES + 1][5] =
 	"BEXB", // Battle Bumper Explosion: Blast
 	"TWBS", // Tripwire Boost
 	"TWBT", // Tripwire BLASTER
+	"SMLD", // Smooth landing
 	"DEZL", // DEZ Laser respawn
 
 	// Additional Kart Objects
@@ -4397,6 +4398,8 @@ state_t states[NUMSTATES] =
 	{SPR_TWBT, FF_FULLBRIGHT|FF_ADD|FF_ANIMATE,                                   -1, {NULL}, 6, 2, S_NULL}, // S_TRIPWIREBOOST_BLAST_TOP
 	{SPR_TWBT, FF_FULLBRIGHT|FF_ADD|FF_ANIMATE|FF_VERTICALFLIP|FF_HORIZONTALFLIP, -1, {NULL}, 6, 2, S_NULL}, // S_TRIPWIREBOOST_BLAST_BOTTOM
 
+	{SPR_SMLD, FF_FULLBRIGHT|FF_ADD|FF_ANIMATE, -1, {NULL}, 7, 2, S_NULL}, // S_SMOOTHLANDING
+
 	{SPR_DEZL, FF_FULLBRIGHT|FF_PAPERSPRITE, 8, {NULL}, 0, 0, S_NULL}, // S_DEZLASER
 	{SPR_DEZL, FF_FULLBRIGHT|1, 2, {NULL}, 0, 0, S_DEZLASER_TRAIL2}, // S_DEZLASER_TRAIL1
 	{SPR_DEZL, FF_FULLBRIGHT|2, 2, {NULL}, 0, 0, S_DEZLASER_TRAIL3}, // S_DEZLASER_TRAIL2
@@ -24470,6 +24473,33 @@ mobjinfo_t mobjinfo[NUMMOBJTYPES] =
 		S_NULL           // raisestate
 	},
 
+	{           // MT_SMOOTHLANDING
+		-1,              // doomednum
+		S_SMOOTHLANDING, // spawnstate
+		1000,            // spawnhealth
+		S_NULL,          // seestate
+		sfx_None,        // seesound
+		8,               // reactiontime
+		sfx_None,        // attacksound
+		S_NULL,          // painstate
+		0,               // painchance
+		sfx_None,        // painsound
+		S_NULL,          // meleestate
+		S_NULL,          // missilestate
+		S_NULL,          // deathstate
+		S_NULL,          // xdeathstate
+		sfx_None,        // deathsound
+		0,               // speed
+		8*FRACUNIT,      // radius
+		16*FRACUNIT,     // height
+		-1,              // display offset
+		100,             // mass
+		0,               // damage
+		sfx_None,        // activesound
+		MF_NOBLOCKMAP|MF_NOGRAVITY|MF_NOCLIPHEIGHT|MF_NOCLIPTHING|MF_DONTENCOREMAP, // flags
+		S_NULL           // raisestate
+	},
+
 	{           // MT_DEZLASER
 		-1,             // doomednum
 		S_DEZLASER,     // spawnstate
diff --git a/src/info.h b/src/info.h
index c5ed74daa..2999ed52b 100644
--- a/src/info.h
+++ b/src/info.h
@@ -1136,6 +1136,7 @@ typedef enum sprite
 	SPR_BEXB, // Battle Bumper Explosion: Blast
 	SPR_TWBS, // Tripwire Boost
 	SPR_TWBT, // Tripwire BLASTER
+	SPR_SMLD, // Smooth landing
 	SPR_DEZL, // DEZ Laser respawn
 
 	// Additional Kart Objects
@@ -4833,6 +4834,8 @@ typedef enum state
 	S_TRIPWIREBOOST_BLAST_TOP,
 	S_TRIPWIREBOOST_BLAST_BOTTOM,
 
+	S_SMOOTHLANDING,
+
 	// DEZ Laser respawn
 	S_DEZLASER,
 	S_DEZLASER_TRAIL1,
@@ -6416,6 +6419,8 @@ typedef enum mobj_type
 
 	MT_TRIPWIREBOOST,
 
+	MT_SMOOTHLANDING,
+
 	MT_DEZLASER,
 
 	MT_WAYPOINT,
diff --git a/src/k_bot.c b/src/k_bot.c
index 968ba8632..1b5a183b0 100644
--- a/src/k_bot.c
+++ b/src/k_bot.c
@@ -952,6 +952,55 @@ static void K_BotTrick(player_t *player, ticcmd_t *cmd, line_t *botController)
 	}
 }
 
+/*--------------------------------------------------
+	static angle_t K_BotSmoothLanding(player_t *player, angle_t destangle)
+
+		Calculates a new destination angle while in the air,
+		to be able to successfully smooth land.
+
+	Input Arguments:-
+		player - Bot player to check.
+		destangle - Previous destination angle.
+
+	Return:-
+		New destination angle.
+--------------------------------------------------*/
+static angle_t K_BotSmoothLanding(player_t *player, angle_t destangle)
+{
+	angle_t newAngle = destangle;
+	boolean air = !P_IsObjectOnGround(player->mo);
+	angle_t steepVal = air ? STUMBLE_STEEP_VAL_AIR : STUMBLE_STEEP_VAL;
+	angle_t slopeSteep = max(AngleDelta(player->mo->pitch, 0), AngleDelta(player->mo->roll, 0));
+
+	if (slopeSteep > steepVal)
+	{
+		fixed_t pitchMul = -FINESINE(destangle >> ANGLETOFINESHIFT);
+		fixed_t rollMul = FINECOSINE(destangle >> ANGLETOFINESHIFT);
+		angle_t testAngles[2];
+		angle_t testDeltas[2];
+		UINT8 i;
+
+		testAngles[0] = R_PointToAngle2(0, 0, rollMul, pitchMul);
+		testAngles[1] = R_PointToAngle2(0, 0, -rollMul, -pitchMul);
+
+		for (i = 0; i < 2; i++)
+		{
+			testDeltas[i] = AngleDelta(testAngles[i], destangle);
+		}
+
+		if (testDeltas[1] < testDeltas[0])
+		{
+			return testAngles[1];
+		}
+		else
+		{
+			return testAngles[0];
+		}
+	}
+
+	return newAngle;
+}
+
 /*--------------------------------------------------
 	static INT32 K_HandleBotTrack(player_t *player, ticcmd_t *cmd, botprediction_t *predict)
 
@@ -975,6 +1024,8 @@ static INT32 K_HandleBotTrack(player_t *player, ticcmd_t *cmd, botprediction_t *
 
 	I_Assert(predict != NULL);
 
+	destangle = K_BotSmoothLanding(player, destangle);
+
 	moveangle = player->mo->angle;
 	anglediff = AngleDeltaSigned(moveangle, destangle);
 
@@ -1105,6 +1156,8 @@ static INT32 K_HandleBotReverse(player_t *player, ticcmd_t *cmd, botprediction_t
 		}
 	}
 
+	destangle = K_BotSmoothLanding(player, destangle);
+
 	// Calculate turn direction first.
 	moveangle = player->mo->angle;
 	angle = (moveangle - destangle);
diff --git a/src/k_kart.c b/src/k_kart.c
index e14995d05..2b1eb3aa1 100644
--- a/src/k_kart.c
+++ b/src/k_kart.c
@@ -19,6 +19,7 @@
 #include "p_setup.h"
 #include "r_draw.h"
 #include "r_local.h"
+#include "r_things.c"
 #include "s_sound.h"
 #include "st_stuff.h"
 #include "v_video.h"
@@ -3797,6 +3798,234 @@ void K_TumblePlayer(player_t *player, mobj_t *inflictor, mobj_t *source)
 		P_StartQuake(64<<FRACBITS, 10);
 }
 
+angle_t K_StumbleSlope(angle_t angle, angle_t pitch, angle_t roll)
+{
+	fixed_t pitchMul = -FINESINE(angle >> ANGLETOFINESHIFT);
+	fixed_t rollMul = FINECOSINE(angle >> ANGLETOFINESHIFT);
+
+	angle_t slope = FixedMul(pitch, pitchMul) + FixedMul(roll, rollMul);
+
+	if (slope > ANGLE_180)
+	{
+		slope = InvAngle(slope);
+	}
+
+	return slope;
+}
+
+boolean K_CheckStumble(player_t *player, angle_t oldPitch, angle_t oldRoll, boolean fromAir)
+{
+	angle_t steepVal = ANGLE_MAX;
+	fixed_t gravityadjust;
+	angle_t oldSlope, newSlope;
+	angle_t slopeDelta;
+
+	// If you don't land upright on a slope, then you tumble,
+	// kinda like Kirby Air Ride
+
+	if (player->tumbleBounces)
+	{
+		// Already tumbling.
+		return false;
+	}
+
+	if ((player->mo->pitch == oldPitch)
+		&& (player->mo->roll == oldRoll))
+	{
+		// No change.
+		return false;
+	}
+
+	if (fromAir == true)
+	{
+		steepVal = STUMBLE_STEEP_VAL_AIR;
+	}
+	else
+	{
+		steepVal = STUMBLE_STEEP_VAL;
+	}
+
+	oldSlope = K_StumbleSlope(player->mo->angle, oldPitch, oldRoll);
+
+	if (oldSlope <= steepVal)
+	{
+		// Transferring from flat ground to a steep slope
+		// is a free action. (The other way around isn't, though.)
+		return false;
+	}
+
+	newSlope = K_StumbleSlope(player->mo->angle, player->mo->pitch, player->mo->roll);
+	slopeDelta = AngleDelta(oldSlope, newSlope);
+
+	if (slopeDelta <= steepVal)
+	{
+		// Needs to be VERY steep before we'll punish this.
+		return false;
+	}
+
+	// Oh jeez, you landed on your side.
+	// You get to tumble.
+
+	P_ResetPlayer(player);
+
+#if 0
+	// Single, medium bounce
+	player->tumbleBounces = TUMBLEBOUNCES;
+	player->tumbleHeight = 30;
+#else
+	// Two small bounces
+	player->tumbleBounces = TUMBLEBOUNCES-1;
+	player->tumbleHeight = 20;
+#endif
+
+	player->pflags &= ~PF_TUMBLESOUND;
+	S_StartSound(player->mo, sfx_s3k9b);
+
+	gravityadjust = P_GetMobjGravity(player->mo)/2;	// so we'll halve it for our calculations.
+
+	if (player->mo->eflags & MFE_UNDERWATER)
+		gravityadjust /= 2;	// halve "gravity" underwater
+
+	// and then modulate momz like that...
+	player->mo->momz = -gravityadjust * player->tumbleHeight;
+
+	P_SetPlayerMobjState(player->mo, S_KART_SPINOUT);
+
+	if (P_IsDisplayPlayer(player))
+		P_StartQuake(64<<FRACBITS, 10);
+
+	// Reset slope.
+	player->mo->pitch = player->mo->roll = 0;
+	return true;
+}
+
+void K_InitStumbleIndicator(player_t *player)
+{
+	mobj_t *new = NULL;
+
+	if (player == NULL)
+	{
+		return;
+	}
+
+	if (player->mo == NULL || P_MobjWasRemoved(player->mo) == true)
+	{
+		return;
+	}
+
+	if (player->stumbleIndicator != NULL && P_MobjWasRemoved(player->stumbleIndicator) == false)
+	{
+		P_RemoveMobj(player->stumbleIndicator);
+	}
+
+	new = P_SpawnMobjFromMobj(player->mo, 0, 0, 0, MT_SMOOTHLANDING);
+
+	P_SetTarget(&player->stumbleIndicator, new);
+	P_SetTarget(&new->target, player->mo);
+}
+
+void K_UpdateStumbleIndicator(player_t *player)
+{
+	const angle_t fudge = ANG15;
+	mobj_t *mobj = NULL;
+
+	boolean air = false;
+	angle_t steepVal = STUMBLE_STEEP_VAL;
+	angle_t slopeSteep = 0;
+	angle_t steepRange = ANGLE_90;
+
+	INT32 delta = 0;
+	INT32 trans = 0;
+
+	if (player == NULL)
+	{
+		return;
+	}
+
+	if (player->mo == NULL || P_MobjWasRemoved(player->mo) == true)
+	{
+		return;
+	}
+
+	if (player->stumbleIndicator == NULL || P_MobjWasRemoved(player->stumbleIndicator) == true)
+	{
+		K_InitStumbleIndicator(player);
+		return;
+	}
+
+	mobj = player->stumbleIndicator;
+
+	P_MoveOrigin(mobj, player->mo->x, player->mo->y, player->mo->z + (player->mo->height / 2));
+
+	air = !P_IsObjectOnGround(player->mo);
+	steepVal = (air ? STUMBLE_STEEP_VAL_AIR : STUMBLE_STEEP_VAL) - fudge;
+	slopeSteep = max(AngleDelta(player->mo->pitch, 0), AngleDelta(player->mo->roll, 0));
+
+	delta = 0;
+
+	if (slopeSteep > steepVal)
+	{
+		angle_t testAngles[2];
+		INT32 testDeltas[2];
+		UINT8 i;
+
+		testAngles[0] = R_PointToAngle2(0, 0, player->mo->pitch, player->mo->roll);
+		testAngles[1] = R_PointToAngle2(0, 0, -player->mo->pitch, -player->mo->roll);
+
+		for (i = 0; i < 2; i++)
+		{
+			testDeltas[i] = AngleDeltaSigned(player->mo->angle, testAngles[i]);
+		}
+
+		if (abs(testDeltas[1]) < abs(testDeltas[0]))
+		{
+			delta = testDeltas[1];
+		}
+		else
+		{
+			delta = testDeltas[0];
+		}
+	}
+
+	if (delta < 0)
+	{
+		mobj->renderflags |= RF_HORIZONTALFLIP;
+	}
+	else
+	{
+		mobj->renderflags &= ~RF_HORIZONTALFLIP;
+	}
+
+	steepRange = ANGLE_90 - steepVal;
+	delta = max(0, abs(delta) - ((signed)steepVal));
+	trans = ((FixedDiv(AngleFixed(delta), AngleFixed(steepRange)) * (NUMTRANSMAPS - 2)) + (FRACUNIT/2)) / FRACUNIT;
+
+	if (trans < 0)
+	{
+		trans = 0;
+	}
+
+	if (trans > (NUMTRANSMAPS - 2))
+	{
+		trans = (NUMTRANSMAPS - 2);
+	}
+
+	// invert
+	trans = (NUMTRANSMAPS - 2) - trans;
+
+	mobj->renderflags |= RF_DONTDRAW;
+
+	if (trans < (NUMTRANSMAPS - 2))
+	{
+		mobj->renderflags &= ~(RF_TRANSMASK | K_GetPlayerDontDrawFlag(player));
+
+		if (trans != 0)
+		{
+			mobj->renderflags |= (trans << RF_TRANSSHIFT);
+		}
+	}
+}
+
 static boolean K_LastTumbleBounceCondition(player_t *player)
 {
 	return (player->tumbleBounces > TUMBLEBOUNCES && player->tumbleHeight < 60);
@@ -3831,6 +4060,7 @@ static void K_HandleTumbleBounce(player_t *player)
 			player->tumbleHeight = 10;
 			player->pflags |= PF_TUMBLELASTBOUNCE;
 			player->mo->rollangle = 0;	// p_user.c will stop rotating the player automatically
+			player->mo->pitch = player->mo->roll = 0; // Prevent Kodachrome Void infinite
 		}
 	}
 
@@ -7899,6 +8129,8 @@ void K_KartPlayerAfterThink(player_t *player)
 {
 	K_KartResetPlayerColor(player);
 
+	K_UpdateStumbleIndicator(player);
+
 	// Move held objects (Bananas, Orbinaut, etc)
 	K_MoveHeldObjects(player);
 
@@ -9340,31 +9572,7 @@ static void K_KartSpindash(player_t *player)
 	}
 	else if (player->fastfall != 0)
 	{
-		// Handle fastfall bounce.
-		const fixed_t maxBounce = player->mo->scale * 10;
-		const fixed_t minBounce = player->mo->scale;
-		fixed_t bounce = 2 * abs(player->fastfall) / 3;
-
-		if (bounce > maxBounce)
-		{
-			bounce = maxBounce;
-		}
-		else
-		{
-			// Lose speed on bad bounce.
-			player->mo->momx /= 2;
-			player->mo->momy /= 2;
-
-			if (bounce < minBounce)
-			{
-				bounce = minBounce;
-			}
-		}
-
-		S_StartSound(player->mo, sfx_ffbonc);
-		player->mo->momz = bounce * P_MobjFlip(player->mo);
-
-		player->fastfall = 0;
+		// Still handling fast-fall bounce.
 		return;
 	}
 
@@ -9431,6 +9639,41 @@ static void K_KartSpindash(player_t *player)
 
 #undef SPINDASHTHRUSTTIME
 
+boolean K_FastFallBounce(player_t *player)
+{
+	// Handle fastfall bounce.
+	if (player->fastfall != 0)
+	{
+		const fixed_t maxBounce = player->mo->scale * 10;
+		const fixed_t minBounce = player->mo->scale;
+		fixed_t bounce = 2 * abs(player->fastfall) / 3;
+
+		if (bounce > maxBounce)
+		{
+			bounce = maxBounce;
+		}
+		else
+		{
+			// Lose speed on bad bounce.
+			player->mo->momx /= 2;
+			player->mo->momy /= 2;
+
+			if (bounce < minBounce)
+			{
+				bounce = minBounce;
+			}
+		}
+
+		S_StartSound(player->mo, sfx_ffbonc);
+		player->mo->momz = bounce * P_MobjFlip(player->mo);
+
+		player->fastfall = 0;
+		return true;
+	}
+
+	return false;
+}
+
 static void K_AirFailsafe(player_t *player)
 {
 	const fixed_t maxSpeed = 6*player->mo->scale;
diff --git a/src/k_kart.h b/src/k_kart.h
index 7b1e0f6ae..46f97a3f5 100644
--- a/src/k_kart.h
+++ b/src/k_kart.h
@@ -28,6 +28,9 @@ Make sure this matches the actual number of states
 #define GROW_PHYSICS_SCALE (3*FRACUNIT/2)
 #define SHRINK_PHYSICS_SCALE (3*FRACUNIT/4)
 
+#define STUMBLE_STEEP_VAL ANG60
+#define STUMBLE_STEEP_VAL_AIR (ANG30 + ANG10)
+
 player_t *K_GetItemBoxPlayer(mobj_t *mobj);
 angle_t K_ReflectAngle(angle_t angle, angle_t against, fixed_t maxspeed, fixed_t yourspeed);
 
@@ -75,6 +78,10 @@ void K_RemoveGrowShrink(player_t *player);
 void K_SpinPlayer(player_t *player, mobj_t *inflictor, mobj_t *source, INT32 type);
 void K_TumblePlayer(player_t *player, mobj_t *inflictor, mobj_t *source);
 void K_TumbleInterrupt(player_t *player);
+angle_t K_StumbleSlope(angle_t angle, angle_t pitch, angle_t roll);
+boolean K_CheckStumble(player_t *player, angle_t oldPitch, angle_t oldRoll, boolean fromAir);
+void K_InitStumbleIndicator(player_t *player);
+void K_UpdateStumbleIndicator(player_t *player);
 INT32 K_ExplodePlayer(player_t *player, mobj_t *inflictor, mobj_t *source);
 void K_DebtStingPlayer(player_t *player, mobj_t *source);
 void K_HandleBumperChanges(player_t *player, UINT8 prevBumpers);
@@ -142,6 +149,7 @@ fixed_t K_GetNewSpeed(player_t *player);
 fixed_t K_3dKartMovement(player_t *player);
 boolean K_PlayerEBrake(player_t *player);
 SINT8 K_Sliptiding(player_t *player);
+boolean K_FastFallBounce(player_t *player);
 void K_AdjustPlayerFriction(player_t *player);
 void K_MoveKartPlayer(player_t *player, boolean onground);
 void K_CheckSpectateStatus(void);
diff --git a/src/p_local.h b/src/p_local.h
index 6c885191c..5fc73f1a2 100644
--- a/src/p_local.h
+++ b/src/p_local.h
@@ -172,7 +172,7 @@ boolean P_IsObjectOnGroundIn(mobj_t *mo, sector_t *sec);
 boolean P_IsObjectOnRealGround(mobj_t *mo, sector_t *sec); // SRB2Kart
 #define P_IsObjectFlipped(o) ((o)->eflags & MFE_VERTICALFLIP)
 boolean P_InQuicksand(mobj_t *mo);
-boolean P_PlayerHitFloor(player_t *player, boolean fromAir);
+boolean P_PlayerHitFloor(player_t *player, boolean fromAir, angle_t oldPitch, angle_t oldRoll);
 
 void P_SetObjectMomZ(mobj_t *mo, fixed_t value, boolean relative);
 void P_RestoreMusic(player_t *player);
diff --git a/src/p_map.c b/src/p_map.c
index e00cbea1c..5b1827988 100644
--- a/src/p_map.c
+++ b/src/p_map.c
@@ -2801,12 +2801,15 @@ boolean P_TryMove(mobj_t *thing, fixed_t x, fixed_t y, boolean allowdropoff)
 
 			if (thing->momz <= 0)
 			{
+				angle_t oldPitch = thing->pitch;
+				angle_t oldRoll = thing->roll;
+
 				thing->standingslope = tmfloorslope;
 				P_SetPitchRollFromSlope(thing, thing->standingslope);
 
-				if (thing->momz == 0 && thing->player && !startingonground)
+				if (thing->player)
 				{
-					P_PlayerHitFloor(thing->player, true);
+					P_PlayerHitFloor(thing->player, !startingonground, oldPitch, oldRoll);
 				}
 			}
 		}
@@ -2821,12 +2824,15 @@ boolean P_TryMove(mobj_t *thing, fixed_t x, fixed_t y, boolean allowdropoff)
 
 			if (thing->momz >= 0)
 			{
+				angle_t oldPitch = thing->pitch;
+				angle_t oldRoll = thing->roll;
+
 				thing->standingslope = tmceilingslope;
 				P_SetPitchRollFromSlope(thing, thing->standingslope);
 
-				if (thing->momz == 0 && thing->player && !startingonground)
+				if (thing->player)
 				{
-					P_PlayerHitFloor(thing->player, true);
+					P_PlayerHitFloor(thing->player, !startingonground, oldPitch, oldRoll);
 				}
 			}
 		}
@@ -3117,7 +3123,7 @@ static boolean P_ThingHeightClip(mobj_t *thing)
 	}
 
 	if ((P_MobjFlip(thing)*(thing->z - oldz) > 0 || hitfloor) && thing->player)
-		P_PlayerHitFloor(thing->player, !onfloor);
+		P_PlayerHitFloor(thing->player, !onfloor, thing->pitch, thing->roll);
 
 	// debug: be sure it falls to the floor
 	thing->eflags &= ~MFE_ONGROUND;
diff --git a/src/p_mobj.c b/src/p_mobj.c
index d3fa4eac1..28b596e2e 100644
--- a/src/p_mobj.c
+++ b/src/p_mobj.c
@@ -1534,12 +1534,18 @@ void P_XYMovement(mobj_t *mo)
 	}
 
 	// adjust various things based on slope
-	if (mo->standingslope && abs(mo->standingslope->zdelta) > FRACUNIT>>8) {
-		if (!P_IsObjectOnGround(mo)) { // We fell off at some point? Do the twisty thing!
+	if (mo->standingslope && abs(mo->standingslope->zdelta) > FRACUNIT>>8)
+	{
+		if (!P_IsObjectOnGround(mo))
+		{
+			// We fell off at some point? Do the twisty thing!
 			P_SlopeLaunch(mo);
 			xmove = mo->momx;
 			ymove = mo->momy;
-		} else { // Still on the ground.
+		}
+		else
+		{
+			// Still on the ground.
 			slopemom.x = xmove;
 			slopemom.y = ymove;
 			slopemom.z = 0;
@@ -1771,7 +1777,9 @@ void P_XYMovement(mobj_t *mo)
 	if (P_MobjWasRemoved(mo)) // MF_SPECIAL touched a player! O_o;;
 		return;
 
-	if (moved && oldslope && !(mo->flags & MF_NOCLIPHEIGHT)) { // Check to see if we ran off
+	if (moved && oldslope && !(mo->flags & MF_NOCLIPHEIGHT))
+	{
+		// Check to see if we ran off
 
 		if (oldslope != mo->standingslope)
 		{
@@ -2727,6 +2735,7 @@ static boolean P_PlayerPolyObjectZMovement(mobj_t *mo)
 void P_PlayerZMovement(mobj_t *mo)
 {
 	boolean onground;
+	angle_t oldPitch, oldRoll;
 
 	I_Assert(mo != NULL);
 	I_Assert(!P_MobjWasRemoved(mo));
@@ -2734,6 +2743,9 @@ void P_PlayerZMovement(mobj_t *mo)
 	if (!mo->player)
 		return;
 
+	oldPitch = mo->pitch;
+	oldRoll = mo->roll;
+
 	// Intercept the stupid 'fall through 3dfloors' bug
 	if (mo->subsector->sector->ffloors)
 		P_AdjustMobjFloorZ_FFloors(mo, mo->subsector->sector, 0);
@@ -2810,7 +2822,7 @@ void P_PlayerZMovement(mobj_t *mo)
 			mo->pmomz = 0; // We're on a new floor, don't keep doing platform movement.
 			mo->eflags |= MFE_JUSTHITFLOOR; // Spin Attack
 
-			clipmomz = P_PlayerHitFloor(mo->player, true);
+			clipmomz = P_PlayerHitFloor(mo->player, true, oldPitch, oldRoll);
 			P_PlayerPolyObjectZMovement(mo);
 
 			if (clipmomz)
@@ -2846,6 +2858,47 @@ void P_PlayerZMovement(mobj_t *mo)
 			mo->eflags &= ~MFE_JUSTHITFLOOR;
 			P_CheckGravity(mo, true);
 		}
+
+		// Even out pitch & roll slowly over time when respawning.
+		if (mo->player->respawn.state != RESPAWNST_NONE)
+		{
+			const angle_t speed = ANG2; //FixedMul(ANG2, abs(mo->momz) / 8);
+			angle_t dest = 0;
+			INT32 pitchDelta = AngleDeltaSigned(mo->pitch, 0);
+			INT32 rollDelta = AngleDeltaSigned(mo->roll, 0);
+
+			if (abs(pitchDelta) <= speed && dest == 0)
+			{
+				mo->pitch = 0;
+			}
+			else if (abs(pitchDelta) > dest)
+			{
+				if (pitchDelta > 0)
+				{
+					mo->pitch -= speed;
+				}
+				else
+				{
+					mo->pitch += speed;
+				}
+			}
+
+			if (abs(rollDelta) <= speed && dest == 0)
+			{
+				mo->roll = 0;
+			}
+			else if (abs(rollDelta) > dest)
+			{
+				if (rollDelta > 0)
+				{
+					mo->roll -= speed;
+				}
+				else
+				{
+					mo->roll += speed;
+				}
+			}
+		}
 	}
 
 	if (((mo->eflags & MFE_VERTICALFLIP && mo->z < mo->floorz) || (!(mo->eflags & MFE_VERTICALFLIP) && mo->z + mo->height > mo->ceilingz))
@@ -11333,6 +11386,8 @@ void P_SpawnPlayer(INT32 playernum)
 	P_SetScale(mobj, mobj->destscale);
 	P_FlashPal(p, 0, 0); // Resets
 
+	K_InitStumbleIndicator(p);
+
 	if (gametyperules & GTR_BUMPERS)
 	{
 		mobj_t *overheadarrow = P_SpawnMobj(mobj->x, mobj->y, mobj->z + mobj->height + 16*FRACUNIT, MT_PLAYERARROW);
diff --git a/src/p_saveg.c b/src/p_saveg.c
index da85dac77..f1e51d3fb 100644
--- a/src/p_saveg.c
+++ b/src/p_saveg.c
@@ -64,6 +64,7 @@ typedef enum
 	SKYBOXVIEW = 0x08,
 	SKYBOXCENTER = 0x10,
 	HOVERHYUDORO = 0x20,
+	STUMBLE = 0x40,
 } player_saveflags;
 
 static inline void P_ArchivePlayer(void)
@@ -202,6 +203,9 @@ static void P_NetArchivePlayers(void)
 		if (players[i].hoverhyudoro)
 			flags |= HOVERHYUDORO;
 
+		if (players[i].stumbleIndicator)
+			flags |= STUMBLE;
+
 		WRITEUINT16(save_p, flags);
 
 		if (flags & SKYBOXVIEW)
@@ -219,6 +223,9 @@ static void P_NetArchivePlayers(void)
 		if (flags & HOVERHYUDORO)
 			WRITEUINT32(save_p, players[i].hoverhyudoro->mobjnum);
 
+		if (flags & STUMBLE)
+			WRITEUINT32(save_p, players[i].stumbleIndicator->mobjnum);
+
 		WRITEUINT32(save_p, (UINT32)players[i].followitem);
 
 		WRITEUINT32(save_p, players[i].charflags);
@@ -509,6 +516,9 @@ static void P_NetUnArchivePlayers(void)
 		if (flags & HOVERHYUDORO)
 			players[i].hoverhyudoro = (mobj_t *)(size_t)READUINT32(save_p);
 
+		if (flags & STUMBLE)
+			players[i].stumbleIndicator = (mobj_t *)(size_t)READUINT32(save_p);
+
 		players[i].followitem = (mobjtype_t)READUINT32(save_p);
 
 		//SetPlayerSkinByNum(i, players[i].skin);
@@ -4289,6 +4299,13 @@ static void P_RelinkPointers(void)
 				if (!P_SetTarget(&mobj->player->hoverhyudoro, P_FindNewPosition(temp)))
 					CONS_Debug(DBG_GAMELOGIC, "hoverhyudoro not found on %d\n", mobj->type);
 			}
+			if (mobj->player->stumbleIndicator)
+			{
+				temp = (UINT32)(size_t)mobj->player->stumbleIndicator;
+				mobj->player->stumbleIndicator = NULL;
+				if (!P_SetTarget(&mobj->player->stumbleIndicator, P_FindNewPosition(temp)))
+					CONS_Debug(DBG_GAMELOGIC, "stumbleIndicator not found on %d\n", mobj->type);
+			}
 		}
 	}
 }
diff --git a/src/p_user.c b/src/p_user.c
index 1e1cfcbcb..f733bad28 100644
--- a/src/p_user.c
+++ b/src/p_user.c
@@ -1339,7 +1339,7 @@ void P_DoPlayerExit(player_t *player)
 //
 // Handles player hitting floor surface.
 // Returns whether to clip momz.
-boolean P_PlayerHitFloor(player_t *player, boolean fromAir)
+boolean P_PlayerHitFloor(player_t *player, boolean fromAir, angle_t oldPitch, angle_t oldRoll)
 {
 	boolean clipmomz;
 
@@ -1347,9 +1347,32 @@ boolean P_PlayerHitFloor(player_t *player, boolean fromAir)
 
 	clipmomz = !(P_CheckDeathPitCollide(player->mo));
 
-	if (fromAir == true && clipmomz == true)
+	if (clipmomz == true)
 	{
-		K_SpawnSplashForMobj(player->mo, abs(player->mo->momz));
+		if (fromAir == true)
+		{
+			K_SpawnSplashForMobj(player->mo, abs(player->mo->momz));
+		}
+
+		if (player->mo->health > 0)
+		{
+			boolean air = fromAir;
+
+			if (P_IsObjectOnGround(player->mo) && (player->mo->eflags & MFE_JUSTHITFLOOR))
+			{
+				air = true;
+			}
+
+			if (K_CheckStumble(player, oldPitch, oldRoll, air) == true)
+			{
+				return false;
+			}
+
+			if (air == false && K_FastFallBounce(player) == true)
+			{
+				return false;
+			}
+		}
 	}
 
 	return clipmomz;
@@ -1662,7 +1685,7 @@ static void P_CheckQuicksand(player_t *player)
 					player->mo->z = ceilingheight - player->mo->height;
 
 				if (player->mo->momz <= 0)
-					P_PlayerHitFloor(player, false);
+					P_PlayerHitFloor(player, false, player->mo->roll, player->mo->pitch);
 			}
 			else
 			{
@@ -1674,7 +1697,7 @@ static void P_CheckQuicksand(player_t *player)
 					player->mo->z = floorheight;
 
 				if (player->mo->momz >= 0)
-					P_PlayerHitFloor(player, false);
+					P_PlayerHitFloor(player, false, player->mo->roll, player->mo->pitch);
 			}
 
 			friction = abs(rover->master->v1->y - rover->master->v2->y)>>6;