FREE PLAY: Correct mistaken assumptions.

- Make the check consistent between HUD and Challenge conditions by revolving both around M_NotFreePlay.
    - The HUD appearance checked every individual component of K_CanChangeRules, so just straight up do that here.
    - If the rules can be changed, battleprisons is always FREE PLAY no matter how many players are present (because it can change quickly).

src/k_hud.c

@@ -4294,22 +4294,7 @@ static void K_drawBattleFullscreen(void)
 	}
 
 	// FREE PLAY?
-	if (K_Cooperative() == false)
+	K_drawKartFreePlay();
-	{
-		UINT8 i;
-
-		// check to see if there's anyone else at all
-		for (i = 0; i < MAXPLAYERS; i++)
-		{
-			if (i == displayplayers[0])
-				continue;
-			if (playeringame[i] && !players[i].spectator)
-				break;
-		}
-
-		if (i == MAXPLAYERS)
-			K_drawKartFreePlay();
-	}
 }
 
 static void K_drawKartFirstPerson(void)
@@ -4701,12 +4686,13 @@ static void K_drawTrickCool(void)
 
 void K_drawKartFreePlay(void)
 {
-	// Doesn't support splitscreens higher than 2 for real estate reasons.
-
 	if (!LUA_HudEnabled(hud_freeplay))
 		return;
 
-	if (modeattacking || grandprixinfo.gp || bossinfo.valid || stplyr->spectator)
+	if (stplyr->spectator == true)
+		return;
+
+	if (M_NotFreePlay(stplyr) == true)
 		return;
 
 	if (lt_exitticker < TICRATE/2)
@@ -5181,8 +5167,7 @@ void K_drawKartHUD(void)
 		V_DrawScaledPatch(BASEVIDWIDTH/2 - (SHORT(kp_yougotem->width)/2), 32, V_HUDTRANS, kp_yougotem);
 
 	// Draw FREE PLAY.
-	if (islonesome && K_Cooperative() == false && gametype != GT_TUTORIAL)
+	K_drawKartFreePlay();
-		K_drawKartFreePlay();
 
 	if (r_splitscreen == 0 && (stplyr->pflags & PF_WRONGWAY) && ((leveltime / 8) & 1))
 	{

src/m_cond.c

@@ -624,13 +624,21 @@ void M_UpdateConditionSetsPending(void)
 	}
 }
 
-static boolean M_NotFreePlay(player_t *player)
+boolean M_NotFreePlay(player_t *player)
 {
 	UINT8 i;
 
-	// Rounds that permit Cooperative play can be played by yourself without being FREE PLAY.
+	if (K_CanChangeRules(true) == false)
-	if (K_Cooperative())
+	{
+		// Rounds with direction are never FREE PLAY.
 		return true;
+	}
+
+	if (battleprisons)
+	{
+		// Prison Break is battle's FREE PLAY.
+		return false;
+	}
 
 	for (i = 0; i < MAXPLAYERS; i++)
 	{

src/m_cond.h

@@ -325,6 +325,8 @@ void M_ClearConditionSet(UINT8 set);
 void M_ClearSecrets(void);
 void M_ClearStats(void);
 
+boolean M_NotFreePlay(player_t *player);
+
 // Updating conditions and unlockables
 boolean M_CheckCondition(condition_t *cn, player_t *player);
 boolean M_UpdateUnlockablesAndExtraEmblems(boolean loud, boolean doall);