diff --git a/src/d_clisrv.c b/src/d_clisrv.c
index 7b6c35eb6..14901360d 100644
--- a/src/d_clisrv.c
+++ b/src/d_clisrv.c
@@ -3461,7 +3461,7 @@ void SV_StartSinglePlayerServer(void)
 	server = true;
 	netgame = false;
 	multiplayer = false;
-	gametype = GT_COOP;
+	G_SetGametype(GT_COOP);
 
 	// no more tic the game with this settings!
 	SV_StopServer();
@@ -3740,7 +3740,7 @@ static void HandlePacketFromAwayNode(SINT8 node)
 			if (client)
 			{
 				maketic = gametic = neededtic = (tic_t)LONG(netbuffer->u.servercfg.gametic);
-				gametype = netbuffer->u.servercfg.gametype;
+				G_SetGametype(netbuffer->u.servercfg.gametype);
 				modifiedgame = netbuffer->u.servercfg.modifiedgame;
 				for (j = 0; j < MAXPLAYERS; j++)
 					adminplayers[j] = netbuffer->u.servercfg.adminplayers[j];
diff --git a/src/d_main.c b/src/d_main.c
index ef6502aec..815136440 100644
--- a/src/d_main.c
+++ b/src/d_main.c
@@ -753,7 +753,7 @@ void D_StartTitle(void)
 
 	gameaction = ga_nothing;
 	displayplayer = consoleplayer = 0;
-	gametype = GT_COOP;
+	G_SetGametype(GT_COOP);
 	paused = false;
 	advancedemo = false;
 	F_InitMenuPresValues();
@@ -1416,7 +1416,7 @@ void D_SRB2Main(void)
 			if (newgametype != -1)
 			{
 				j = gametype;
-				gametype = newgametype;
+				G_SetGametype(newgametype);
 				D_GameTypeChanged(j);
 			}
 		}
diff --git a/src/d_netcmd.c b/src/d_netcmd.c
index 00cb6e65e..40d626185 100644
--- a/src/d_netcmd.c
+++ b/src/d_netcmd.c
@@ -125,6 +125,7 @@ static void Command_Version_f(void);
 static void Command_ModDetails_f(void);
 #endif
 static void Command_ShowGametype_f(void);
+static void Command_SetGametype_f(void);
 FUNCNORETURN static ATTRNORETURN void Command_Quit_f(void);
 static void Command_Playintro_f(void);
 
@@ -381,6 +382,7 @@ char timedemo_csv_id[256];
 boolean timedemo_quit;
 
 INT16 gametype = GT_COOP;
+INT16 gametyperules = 0;
 boolean splitscreen = false;
 boolean circuitmap = false;
 INT32 adminplayers[MAXPLAYERS];
@@ -480,6 +482,7 @@ void D_RegisterServerCommands(void)
 	COM_AddCommand("suicide", Command_Suicide);
 
 	COM_AddCommand("gametype", Command_ShowGametype_f);
+	COM_AddCommand("setgametype", Command_SetGametype_f);
 	COM_AddCommand("version", Command_Version_f);
 #ifdef UPDATE_ALERT
 	COM_AddCommand("mod_details", Command_ModDetails_f);
@@ -2065,6 +2068,7 @@ static void Got_Mapcmd(UINT8 **cp, INT32 playernum)
 
 	lastgametype = gametype;
 	gametype = READUINT8(*cp);
+	G_SetGametype(gametype); // I fear putting that macro as an argument
 
 	if (gametype < 0 || gametype >= NUMGAMETYPES)
 		gametype = lastgametype;
@@ -3623,6 +3627,12 @@ static void Command_ShowGametype_f(void)
 		CONS_Printf(M_GetText("Unknown gametype set (%d)\n"), gametype);
 }
 
+static void Command_SetGametype_f(void)
+{
+	if (COM_Argc() > 1)
+		G_SetGametype(atoi(COM_Argv(1)));
+}
+
 /** Plays the intro.
   */
 static void Command_Playintro_f(void)
@@ -3935,7 +3945,7 @@ void D_GameTypeChanged(INT32 lastgametype)
 	}
 	else if (!multiplayer && !netgame)
 	{
-		gametype = GT_COOP;
+		G_SetGametype(GT_COOP);
 		// These shouldn't matter anymore
 		//CV_Set(&cv_itemrespawntime, cv_itemrespawntime.defaultvalue);
 		//CV_SetValue(&cv_itemrespawn, 0);
diff --git a/src/doomstat.h b/src/doomstat.h
index 772f6b3fb..2b493c917 100644
--- a/src/doomstat.h
+++ b/src/doomstat.h
@@ -84,6 +84,7 @@ extern boolean addedtogame; // true after the server has added you
 extern boolean multiplayer;
 
 extern INT16 gametype;
+extern INT16 gametyperules;
 extern boolean splitscreen;
 extern boolean circuitmap; // Does this level have 'circuit mode'?
 extern boolean fromlevelselect;
@@ -407,6 +408,17 @@ enum GameType
 };
 // If you alter this list, update dehacked.c, MISC_ChangeGameTypeMenu in m_menu.c, and Gametype_Names in g_game.c
 
+// Game type rules
+enum GameTypeRules
+{
+	GTR_PLATFORM    = 1,    // Co-op, Competition, Race
+	GTR_TAG         = 1<<1, // Tag, Hide and Seek
+	GTR_RINGSLINGER = 1<<2, // Not Co-op, not Competition, and not Race (overriden by cv_ringslinger)
+	GTR_SPECTATORS  = 1<<3, // Not Co-op, not Competition, and not Race
+	GTR_TEAMS       = 1<<4, // Team Match, CTF
+	GTR_LIVES       = 1<<5, // A lot of special cases in G_GametypeUsesLives actually, but just Co-op and Competition
+};
+
 // String names for gametypes
 extern const char *Gametype_Names[NUMGAMETYPES];
 
diff --git a/src/g_game.c b/src/g_game.c
index 2a12dd298..d1fc61c35 100644
--- a/src/g_game.c
+++ b/src/g_game.c
@@ -3058,6 +3058,34 @@ const char *Gametype_Names[NUMGAMETYPES] =
 	"CTF" // GT_CTF
 };
 
+// Game type rules
+INT16 gametypedefaultrules[NUMGAMETYPES] =
+{
+	GTR_PLATFORM|GTR_LIVES, // GT_COOP
+	GTR_PLATFORM|GTR_LIVES, // GT_COMPETITION
+	GTR_PLATFORM, // GT_RACE
+
+	GTR_RINGSLINGER|GTR_SPECTATORS, // GT_MATCH
+	GTR_RINGSLINGER|GTR_TEAMS|GTR_SPECTATORS, // GT_TEAMMATCH
+
+	GTR_RINGSLINGER|GTR_TAG|GTR_SPECTATORS, // GT_TAG
+	GTR_RINGSLINGER|GTR_TAG|GTR_SPECTATORS, // GT_HIDEANDSEEK
+
+	GTR_RINGSLINGER|GTR_TEAMS|GTR_SPECTATORS // GT_CTF
+};
+
+//
+// G_SetGametype
+//
+// Set a new gametype, also setting gametype rules accordingly. Yay!
+//
+void G_SetGametype(INT16 gtype)
+{
+	gametype = gtype;
+	gametyperules = gametypedefaultrules[gametype];
+	CONS_Printf("Gametype set to %s (%d)\n", Gametype_Names[gametype], gametype);
+}
+
 //
 // G_GetGametypeByName
 //
@@ -3101,7 +3129,8 @@ boolean G_IsSpecialStage(INT32 mapnum)
 boolean G_GametypeUsesLives(void)
 {
 	 // Coop, Competitive
-	if ((gametype == GT_COOP || gametype == GT_COMPETITION)
+	//if ((gametype == GT_COOP || gametype == GT_COMPETITION)
+	if ((gametyperules & GTR_LIVES)
 	 && !(modeattacking || metalrecording) // No lives in Time Attack
 	 && !G_IsSpecialStage(gamemap)
 	 && !(maptol & TOL_NIGHTS)) // No lives in NiGHTS
@@ -3117,7 +3146,8 @@ boolean G_GametypeUsesLives(void)
 //
 boolean G_GametypeHasTeams(void)
 {
-	return (gametype == GT_TEAMMATCH || gametype == GT_CTF);
+	return (gametyperules & GTR_TEAMS);
+	//return (gametype == GT_TEAMMATCH || gametype == GT_CTF);
 }
 
 //
@@ -3128,7 +3158,8 @@ boolean G_GametypeHasTeams(void)
 //
 boolean G_GametypeHasSpectators(void)
 {
-	return (gametype != GT_COOP && gametype != GT_COMPETITION && gametype != GT_RACE);
+	return (gametyperules & GTR_SPECTATORS);
+	//return (gametype != GT_COOP && gametype != GT_COMPETITION && gametype != GT_RACE);
 }
 
 //
@@ -3139,7 +3170,8 @@ boolean G_GametypeHasSpectators(void)
 //
 boolean G_RingSlingerGametype(void)
 {
-	return ((gametype != GT_COOP && gametype != GT_COMPETITION && gametype != GT_RACE) || (cv_ringslinger.value));
+	return ((gametyperules & GTR_RINGSLINGER) || (cv_ringslinger.value));
+	//return ((gametype != GT_COOP && gametype != GT_COMPETITION && gametype != GT_RACE) || (cv_ringslinger.value));
 }
 
 //
@@ -3149,7 +3181,8 @@ boolean G_RingSlingerGametype(void)
 //
 boolean G_PlatformGametype(void)
 {
-	return (gametype == GT_COOP || gametype == GT_RACE || gametype == GT_COMPETITION);
+	return (gametyperules & GTR_PLATFORM);
+	//return (gametype == GT_COOP || gametype == GT_RACE || gametype == GT_COMPETITION);
 }
 
 //
@@ -3159,7 +3192,8 @@ boolean G_PlatformGametype(void)
 //
 boolean G_TagGametype(void)
 {
-	return (gametype == GT_TAG || gametype == GT_HIDEANDSEEK);
+	return (gametyperules & GTR_TAG);
+	//return (gametype == GT_TAG || gametype == GT_HIDEANDSEEK);
 }
 
 /** Get the typeoflevel flag needed to indicate support of a gametype.
diff --git a/src/g_game.h b/src/g_game.h
index e7f4a4677..a925e14c1 100644
--- a/src/g_game.h
+++ b/src/g_game.h
@@ -201,6 +201,7 @@ ATTRNORETURN void FUNCNORETURN G_StopMetalRecording(boolean kill);
 void G_StopDemo(void);
 boolean G_CheckDemoStatus(void);
 
+void G_SetGametype(INT16 gametype);
 INT32 G_GetGametypeByName(const char *gametypestr);
 boolean G_IsSpecialStage(INT32 mapnum);
 boolean G_GametypeUsesLives(void);