diff --git a/source/core/d_net.cpp b/source/core/d_net.cpp
index c9d399a6d..7eee62175 100644
--- a/source/core/d_net.cpp
+++ b/source/core/d_net.cpp
@@ -1972,6 +1972,12 @@ void Net_SkipCommand (int type, uint8_t **stream)
 #endif
 }
 
+void Net_ClearFifo(void)
+{
+	// Q: Do we need this?
+}
+
+
 // This was taken out of shared_hud, because UI code shouldn't do low level calculations that may change if the backing implementation changes.
 int Net_GetLatency(int *ld, int *ad)
 {
diff --git a/source/core/d_net.h b/source/core/d_net.h
index 5b72f38ef..138829e91 100644
--- a/source/core/d_net.h
+++ b/source/core/d_net.h
@@ -55,6 +55,8 @@ void Net_ClearBuffers ();
 
 bool D_CheckNetGame(void);
 
+void Net_ClearFifo(void);
+
 
 // Netgame stuff (buffers and pointers, i.e. indices).
 
diff --git a/source/core/gamecontrol.cpp b/source/core/gamecontrol.cpp
index 7728dc53c..d6d42d02b 100644
--- a/source/core/gamecontrol.cpp
+++ b/source/core/gamecontrol.cpp
@@ -101,7 +101,7 @@ int lastTic;
 
 int automapMode;
 bool automapFollow;
-extern int pauseext;
+extern bool pauseext;
 
 CCMD(togglemap)
 {
@@ -863,7 +863,13 @@ int RunGame()
 	SetupGameButtons();
 	gi->app_init();
 
-	app_loop();
+	// Duke has transitioned to the new main loop, the other games haven't yet.
+	if (g_gameType & GAMEFLAG_DUKE | GAMEFLAG_RRALL | GAMEFLAG_NAM | GAMEFLAG_NAPALM | GAMEFLAG_WW2GI)
+	{
+		D_CheckNetGame();
+		MainLoop();
+	}
+	else app_loop();
 	return 0; // this is never reached. app_loop only exits via exception.
 }
 
@@ -1246,3 +1252,18 @@ CCMD(taunt)
 
 	}
 }
+
+//---------------------------------------------------------------------------
+//
+// 
+//
+//---------------------------------------------------------------------------
+
+void startmainmenu()
+{
+	gamestate = GS_MENUSCREEN;
+	M_StartControlPanel(false);
+	M_SetMenu(NAME_Mainmenu);
+	FX_StopAllSounds();
+}
+
diff --git a/source/core/gamecontrol.h b/source/core/gamecontrol.h
index fee026fe7..8162e3fcd 100644
--- a/source/core/gamecontrol.h
+++ b/source/core/gamecontrol.h
@@ -8,12 +8,14 @@
 #include "tarray.h"
 #include "name.h"
 #include "memarena.h"
+#include "stats.h"
 
 extern FString currentGame;
 extern FString LumpFilter;
 class FArgs;
 extern bool GUICapture;
 extern bool AppActive;
+extern cycle_t drawtime, actortime, thinktime, gameupdatetime;
 
 extern FMemArena dump;	// this is for memory blocks than cannot be deallocated without some huge effort. Put them in here so that they do not register on shutdown.
 
@@ -46,6 +48,7 @@ void CONFIG_ReadCombatMacros();
 int32_t CONFIG_GetMapBestTime(char const* const mapname, uint8_t const* const mapmd4);
 int CONFIG_SetMapBestTime(uint8_t const* const mapmd4, int32_t tm);
 int GameMain();
+void startmainmenu();
 
 struct UserConfig
 {
diff --git a/source/core/gamestruct.h b/source/core/gamestruct.h
index 1e0412588..b4226b572 100644
--- a/source/core/gamestruct.h
+++ b/source/core/gamestruct.h
@@ -60,7 +60,6 @@ struct GameInterface
 	virtual ~GameInterface() {}
 	virtual bool GenerateSavePic() { return false; }
 	virtual void app_init() = 0;
-	virtual void RunGameFrame() = 0;
 	virtual void clearlocalinputstate() {}
 	virtual void UpdateScreenSize() {}
 	virtual void FreeGameData() {}
@@ -101,6 +100,8 @@ struct GameInterface
 	virtual void Ticker() {}
 	virtual int GetPlayerChecksum(int pnum) { return 0x12345678 + pnum; }
 
+	virtual void RunGameFrame() {} // this must go away once things are done.
+
 
 };
 
diff --git a/source/core/mainloop.cpp b/source/core/mainloop.cpp
index 3848da8ba..227aed0b3 100644
--- a/source/core/mainloop.cpp
+++ b/source/core/mainloop.cpp
@@ -81,6 +81,7 @@
 #include "v_video.h"
 #include "glbackend/glbackend.h"
 #include "palette.h"
+#include "build.h"
 
 CVAR(Bool, vid_activeinbackground, false, CVAR_ARCHIVE | CVAR_GLOBALCONFIG)
 CVAR(Bool, r_ticstability, true, CVAR_ARCHIVE | CVAR_GLOBALCONFIG)
@@ -183,11 +184,15 @@ static void GameTicker()
 	{
 	default:
 	case GS_STARTUP:
+		artClearMapArt();
 		gi->Startup();
 		break;
 
 	case GS_LEVEL:
+		gameupdatetime.Reset();
+		gameupdatetime.Clock();
 		gi->Ticker();
+		gameupdatetime.Unclock();
 		break;
 
 	case GS_MENUSCREEN:
@@ -371,7 +376,10 @@ void TryRunTics (void)
 			gi->Predict(myconnectindex);
 #endif
 		}
-		gi->GetInput(nullptr);
+		if (!cl_syncinput)
+		{
+			gi->GetInput(nullptr);
+		}
 		return;
 	}
 
diff --git a/source/exhumed/src/exhumed.h b/source/exhumed/src/exhumed.h
index f79a2bc48..b68612191 100644
--- a/source/exhumed/src/exhumed.h
+++ b/source/exhumed/src/exhumed.h
@@ -89,7 +89,6 @@ void CheckKeys2();
 void GameTicker();
 void InitLevel(int);
 void InitNewGame();
-void startmainmenu();
 
 int showmap(short nLevel, short nLevelNew, short nLevelBest);
 void menu_DoPlasma();
diff --git a/source/exhumed/src/gameloop.cpp b/source/exhumed/src/gameloop.cpp
index 81db62bbf..4ae409ceb 100644
--- a/source/exhumed/src/gameloop.cpp
+++ b/source/exhumed/src/gameloop.cpp
@@ -136,20 +136,6 @@ static void GameDisplay(void)
 //
 //---------------------------------------------------------------------------
 
-void startmainmenu()
-{
-    gamestate = GS_MENUSCREEN;
-    M_StartControlPanel(false);
-    M_SetMenu(NAME_Mainmenu);
-    StopAllSounds();
-}
-
-//---------------------------------------------------------------------------
-//
-// 
-//
-//---------------------------------------------------------------------------
-
 void drawmenubackground()
 {
     auto nLogoTile = EXHUMED ? kExhumedLogo : kPowerslaveLogo;
diff --git a/source/games/duke/src/d_menu.cpp b/source/games/duke/src/d_menu.cpp
index 43dd57d7e..a200ba41b 100644
--- a/source/games/duke/src/d_menu.cpp
+++ b/source/games/duke/src/d_menu.cpp
@@ -361,8 +361,7 @@ void GameInterface::DrawPlayerSprite(const DVector2& origin, bool onteam)
 
 void GameInterface::QuitToTitle()
 {
-	ps[myconnectindex].gm = MODE_DEMO;
-	artClearMapArt();
+	gamestate = GS_STARTUP;
 }
 
 END_DUKE_NS
diff --git a/source/games/duke/src/duke3d.h b/source/games/duke/src/duke3d.h
index d44c2c4eb..ed5215f66 100644
--- a/source/games/duke/src/duke3d.h
+++ b/source/games/duke/src/duke3d.h
@@ -22,8 +22,6 @@
 #include "stats.h"
 #include "binaryangle.h"
 
-extern cycle_t drawtime, actortime, thinktime, gameupdatetime;
-
 BEGIN_DUKE_NS
 
 extern FFont* IndexFont;
@@ -33,7 +31,6 @@ struct GameInterface : public ::GameInterface
 {
 	const char* Name() override { return "Duke"; }
 	void app_init() override;
-	void RunGameFrame() override;
 	void clearlocalinputstate() override;
 	bool GenerateSavePic() override;
 	void PlayHudSound() override;
diff --git a/source/games/duke/src/funct.h b/source/games/duke/src/funct.h
index a6df8ffae..4cd6c2884 100644
--- a/source/games/duke/src/funct.h
+++ b/source/games/duke/src/funct.h
@@ -193,7 +193,6 @@ void resetinventory(int pn);
 void resetplayerstats(int pn);
 void resetweapons(int pn);
 void resetprestat(int snum, int g);
-void clearfifo(void);
 void prelevel_common(int g);
 void cacheit_d();
 void cacheit_r();
@@ -234,7 +233,6 @@ void apply_seasick(player_struct* p, double scalefactor);
 void calcviewpitch(player_struct* p, double factor);
 void sethorizon(int snum, ESyncBits actions, double factor, fixed_t adjustment);
 bool movementBlocked(int snum);
-void startmainmenu();
 void loadcons();
 
 void updateinterpolations();
diff --git a/source/games/duke/src/game_misc.cpp b/source/games/duke/src/game_misc.cpp
index db93759a2..dd090834f 100644
--- a/source/games/duke/src/game_misc.cpp
+++ b/source/games/duke/src/game_misc.cpp
@@ -175,7 +175,7 @@ void FTA(int q, struct player_struct* p)
 //
 //==========================================================================
 
-void drawbackground(void)
+void GameInterface::DrawBackground()
 {
 	twod->ClearScreen();
 	auto tex = tileGetTexture(TILE_MENUSCREEN);
diff --git a/source/games/duke/src/gameloop.cpp b/source/games/duke/src/gameloop.cpp
index c0500974b..d7bdae796 100644
--- a/source/games/duke/src/gameloop.cpp
+++ b/source/games/duke/src/gameloop.cpp
@@ -38,149 +38,14 @@ Modifications for JonoF's port by Jonathon Fowler (jf@jonof.id.au)
 
 BEGIN_DUKE_NS
 
-//---------------------------------------------------------------------------
-//
-// abstract the queue's implementation
-// All access to the input queues should go through this function interface.
-//
-//---------------------------------------------------------------------------
-static InputPacket inputfifo[MOVEFIFOSIZ][MAXPLAYERS];
-static int movefifoend[MAXPLAYERS];
-static int movefifoplc;
-static int bufferjitter;
-
-void clearfifo(void)
-{
-	memset(&inputfifo, 0, sizeof(inputfifo));
-	memset(sync, 0, sizeof(sync));
-}
-
-
-static inline void GetNextInput()
-{
-	for (int i = connecthead; i >= 0; i = connectpoint2[i])
-		memcpy(&sync[i], &inputfifo[movefifoplc & (MOVEFIFOSIZ - 1)][i], sizeof(InputPacket));
-
-	movefifoplc++;
-}
-
-static void advancequeue(int myconnectindex)
-{
-	movefifoend[myconnectindex]++;
-}
-
-static InputPacket& nextinput(int myconnectindex)
-{
-	return inputfifo[movefifoend[myconnectindex] & (MOVEFIFOSIZ - 1)][myconnectindex];
-}
-
-bool shouldprocessinput(int myconnectindex)
-{
-	if (movefifoend[myconnectindex] - movefifoplc > bufferjitter)
-	{
-		int i;
-		for (i = connecthead; i >= 0; i = connectpoint2[i])
-			if (movefifoplc == movefifoend[i]) return false;
-		if (i >= 0) return false;
-		return true;
-	}
-	return false;
-}
-
-static void fakedomovethings()
-{
-	// prediction
-}
-
-static void fakedomovethingscorrect()
-{
-	// unprediction
-}
-
-void prediction()
-{
-#if 0
-	// We currently have no net code driving this.
-	if (numplayers > 1)
-		while (fakemovefifoplc < movefifoend[myconnectindex]) fakedomovethings();
-	getpackets();
-#endif
-}
-
-//---------------------------------------------------------------------------
-//
-// 
-//
-//---------------------------------------------------------------------------
-/*
-void mploadsave()
-{
-	for(int i=connecthead;i>=0;i=connectpoint2[i])
-		if( sync[i].bits&(1<<17) )
-	{
-		multiflag = 2;
-		multiwhat = (sync[i].bits>>18)&1;
-		multipos = (unsigned) (sync[i].bits>>19)&15;
-		multiwho = i;
-
-		if( multiwhat )
-		{
-			saveplayer( multipos );
-			multiflag = 0;
-
-			if(multiwho != myconnectindex)
-			{
-				strcpy(&fta_quotes[122],&ud.user_name[multiwho][0]);
-				strcat(&fta_quotes[122]," SAVED A MULTIPLAYER GAME");
-				FTA(122,&ps[myconnectindex]);
-			}
-			else
-			{
-				strcpy(&fta_quotes[122],"MULTIPLAYER GAME SAVED");
-				FTA(122,&ps[myconnectindex]);
-			}
-			break;
-		}
-		else
-		{
-//            waitforeverybody();
-
-			j = loadplayer( multipos );
-
-			multiflag = 0;
-
-			if(j == 0 && !isRR())
-			{
-				if(multiwho != myconnectindex)
-				{
-					strcpy(&fta_quotes[122],&ud.user_name[multiwho][0]);
-					strcat(&fta_quotes[122]," LOADED A MULTIPLAYER GAME");
-					FTA(122,&ps[myconnectindex]);
-				}
-				else
-				{
-					strcpy(&fta_quotes[122],"MULTIPLAYER GAME LOADED");
-					FTA(122,&ps[myconnectindex]);
-				}
-				return 1;
-			}
-		}
-	}
-}
-*/
-
 //---------------------------------------------------------------------------
 //
 // 
 //
 //---------------------------------------------------------------------------
 
-int domovethings()
+void GameInterface::Ticker()
 {
-	int i;
-
-	// mplpadsave();
-
 	ud.camerasprite = -1;
 
 	if (earthquaketime > 0) earthquaketime--;
@@ -192,51 +57,15 @@ int domovethings()
 	}
 
 	everyothertime++;
-	GetNextInput();
 	updateinterpolations();
 
-#if 0
-	j = -1;
-	for (i = connecthead; i >= 0; i = connectpoint2[i])
-	{
-		if (PlayerInput(i, SKB_GAMEQUIT))
-		{
-			if (i == myconnectindex) gameexitfrommenu();
-			if (screenpeek == i)
-			{
-				screenpeek = connectpoint2[i];
-				if (screenpeek < 0) screenpeek = connecthead;
-			}
-
-			if (i == connecthead) connecthead = connectpoint2[connecthead];
-			else connectpoint2[j] = connectpoint2[i];
-
-			numplayers--;
-			ud.multimode--;
-
-			//closedemowrite();
-
-			if (numplayers < 2 && !isRR())
-				S_PlaySound(GENERIC_AMBIENCE17, CHAN_AUTO, CHANF_UI);
-
-			Printf(PRINT_NOTIFY, "%s is history!", ud.user_name[i]);
-
-			quickkill(&ps[i]);
-			deletesprite(ps[i].i);
-		}
-		else j = i;
-	}
-#endif
-
-	//if(ud.recstat == 1) record();
-
 	if (playrunning())
 	{
 		global_random = krand();
 		movedummyplayers();//ST 13
 	}
 
-	for (i = connecthead; i >= 0; i = connectpoint2[i])
+	for (int i = connecthead; i >= 0; i = connectpoint2[i])
 	{
 		if (playrunning())
 		{
@@ -258,8 +87,6 @@ int domovethings()
 		fi.think();
 	}
 
-	fakedomovethingscorrect();
-
 	if ((everyothertime & 1) == 0)
 	{
 		fi.animatewalls();
@@ -269,80 +96,11 @@ int domovethings()
 	if (isRR() && ud.recstat == 0 && ud.multimode < 2)
 		dotorch();
 
-	return 0;
-}
-
-//---------------------------------------------------------------------------
-//
-// 
-//
-//---------------------------------------------------------------------------
-
-void GameTicker()
-{
-	if (ps[myconnectindex].gm == MODE_DEMO)
-	{
-		M_ClearMenus();
-		gamestate = GS_STARTUP;
-		return;
-	}
-
-	//Net_GetPackets();
-
-
-	gameupdatetime.Reset();
-	gameupdatetime.Clock();
-
-	int const currentTic = I_GetTime();
-	gameclock = I_GetBuildTime() - gameclockstart;
-
-	while (playrunning() && currentTic - lastTic >= 1)
-	{
-		lastTic = currentTic;
-		auto& input = nextinput(myconnectindex);
-
-		gi->GetInput(&input);
-
-		advancequeue(myconnectindex);
-
-		if (playrunning())
-		{
-			prediction();
-
-			if (numplayers < 2) bufferjitter = 0;
-			while (shouldprocessinput(myconnectindex))
-			{
-				if (domovethings()) break;
-			}
-		}
-	}
-
-	gameupdatetime.Unclock();
-
 	if (ps[myconnectindex].gm & (MODE_EOL | MODE_RESTART))
 	{
 		exitlevel();
 	}
-
-	if (!cl_syncinput)
-	{
-		gi->GetInput(nullptr);
-	}
-
-	nonsharedkeys();
-	gi->UpdateSounds();
-	drawtime.Reset();
-	drawtime.Clock();
-	videoSetBrightness(thunder_brightness);
-	double const smoothRatio = playrunning() ? I_GetTimeFrac() * MaxSmoothRatio : MaxSmoothRatio;
-	displayrooms(screenpeek, smoothRatio);
-	drawoverlays(smoothRatio);
-	drawtime.Unclock();
-
-	if (ps[myconnectindex].gm == MODE_DEMO)
-	{
-		gamestate = GS_STARTUP;
-	}
+ 	nonsharedkeys();
 }
 
 //---------------------------------------------------------------------------
@@ -351,14 +109,6 @@ void GameTicker()
 //
 //---------------------------------------------------------------------------
 
-void startmainmenu()
-{
-	gamestate = GS_MENUSCREEN;
-	M_StartControlPanel(false);
-	M_SetMenu(NAME_Mainmenu);
-	FX_StopAllSounds();
-}
-
 void resetGameClock()
 {
 	I_SetFrameTime();
@@ -367,33 +117,6 @@ void resetGameClock()
 	cloudclock = 0;
 }
 
-static void Startup()
-{
-	resetGameClock();
-		ps[myconnectindex].ftq = 0;
-
-		if (userConfig.CommandMap.IsNotEmpty())
-		{
-			auto maprecord = FindMapByName(userConfig.CommandMap);
-			userConfig.CommandMap = "";
-			if (maprecord)
-			{
-				ud.m_respawn_monsters = ud.m_player_skill == 4;
-
-				for (int i = 0; i != -1; i = connectpoint2[i])
-				{
-					resetweapons(i);
-					resetinventory(i);
-				}
-				startnewgame(maprecord, /*userConfig.skill*/2);
-			}
-		}
-		else
-		{
-			fi.ShowLogo([](bool) { startmainmenu(); });
-		}
-}
-
 //---------------------------------------------------------------------------
 //
 // 
@@ -402,47 +125,48 @@ static void Startup()
 
 void GameInterface::Startup()
 {
+	resetGameClock();
+	ps[myconnectindex].ftq = 0;
 
-}
-void GameInterface::DrawBackground()
-{
-
-}
-void GameInterface::Render()
-{
-
-}
-void GameInterface::Ticker()
-{
-
-}
-
-
-void GameInterface::RunGameFrame()
-{
-	switch (gamestate)
+	if (userConfig.CommandMap.IsNotEmpty())
 	{
-	default:
-	case GS_STARTUP:
-		Startup();
-		break;
-
-	case GS_MENUSCREEN:
-	case GS_FULLCONSOLE:
-		drawbackground();
-		break;
-
-	case GS_LEVEL:
-		GameTicker();
-		break;
-
-	case GS_INTERMISSION:
-	case GS_INTRO:
-		RunScreenJobFrame();
-		break;
+		auto maprecord = FindMapByName(userConfig.CommandMap);
+		userConfig.CommandMap = "";
+		if (maprecord)
+		{
+			ud.m_respawn_monsters = ud.m_player_skill == 4;
 
+			for (int i = 0; i != -1; i = connectpoint2[i])
+			{
+				resetweapons(i);
+				resetinventory(i);
+			}
+			startnewgame(maprecord, /*userConfig.skill*/2);
+		}
+	}
+	else
+	{
+		fi.ShowLogo([](bool) { startmainmenu(); });
 	}
 }
 
+//---------------------------------------------------------------------------
+//
+// 
+//
+//---------------------------------------------------------------------------
+
+void GameInterface::Render()
+{
+	drawtime.Reset();
+	drawtime.Clock();
+	videoSetBrightness(thunder_brightness);
+	double const smoothRatio = playrunning() ? I_GetTimeFrac() * MaxSmoothRatio : MaxSmoothRatio;
+	displayrooms(screenpeek, smoothRatio);
+	drawoverlays(smoothRatio);
+	drawtime.Unclock();
+}
+
+
 END_DUKE_NS
 
diff --git a/source/games/duke/src/premap.cpp b/source/games/duke/src/premap.cpp
index b49b56023..53a3d1ad3 100644
--- a/source/games/duke/src/premap.cpp
+++ b/source/games/duke/src/premap.cpp
@@ -1013,7 +1013,7 @@ int enterlevel(MapRecord *mi, int gamemode)
     global_random = 0;
 
     ud.last_level = currentLevel->levelNumber;
-    clearfifo();
+    Net_ClearFifo();
     for (int i=numinterpolations-1; i>=0; i--) bakipos[i] = *curipos[i];
     ps[myconnectindex].over_shoulder_on = 0;
     clearfrags();
diff --git a/source/games/duke/src/savegame.cpp b/source/games/duke/src/savegame.cpp
index 01137ccf8..22f565ea5 100644
--- a/source/games/duke/src/savegame.cpp
+++ b/source/games/duke/src/savegame.cpp
@@ -520,7 +520,7 @@ void GameInterface::SerializeGameState(FSerializer& arc)
 			recreateinterpolations();
 			show_shareware = 0;
 			everyothertime = 0;
-			clearfifo();
+			Net_ClearFifo();
 
 			// should be unnecessary with the sounds getting serialized as well.
 			#if 0