diff --git a/src/actor.h b/src/actor.h
index e089de96ac..79358148fe 100644
--- a/src/actor.h
+++ b/src/actor.h
@@ -704,6 +704,7 @@ public:
 
 	// Return starting health adjusted by skill level
 	int SpawnHealth();
+	int GibHealth();
 
 	// Check for monsters that count as kill but excludes all friendlies.
 	bool CountsAsKill() const
diff --git a/src/d_main.cpp b/src/d_main.cpp
index cbed77f800..d24b8c57d4 100644
--- a/src/d_main.cpp
+++ b/src/d_main.cpp
@@ -785,7 +785,7 @@ void D_Display ()
 		FTexture *tex;
 		int x;
 
-		tex = TexMan[gameinfo.gametype & (GAME_DoomStrifeChex) ? "M_PAUSE" : "PAUSED"];
+		tex = TexMan[gameinfo.PauseSign];
 		x = (SCREENWIDTH - tex->GetScaledWidth() * CleanXfac)/2 +
 			tex->GetScaledLeftOffset() * CleanXfac;
 		screen->DrawTexture (tex, x, 4, DTA_CleanNoMove, true, TAG_DONE);
diff --git a/src/g_shared/a_keys.cpp b/src/g_shared/a_keys.cpp
index 1169acb885..aaddb9084a 100644
--- a/src/g_shared/a_keys.cpp
+++ b/src/g_shared/a_keys.cpp
@@ -424,10 +424,10 @@ bool P_CheckKeys (AActor *owner, int keynum, bool remote)
 
 	if (!locks[keynum]) 
 	{
-		if (keynum == 103 && gameinfo.gametype == GAME_Strife)
-			failtext = "THIS AREA IS ONLY AVAILABLE IN THE RETAIL VERSION OF STRIFE";
+		if (keynum == 103 && (gameinfo.flags & GI_SHAREWARE))
+			failtext = "$TXT_RETAIL_ONLY";
 		else
-			failtext = "That doesn't seem to work";
+			failtext = "$TXT_DOES_NOT_WORK";
 
 		failsound = failage;
 		numfailsounds = countof(failage);
diff --git a/src/gi.cpp b/src/gi.cpp
index 0a3f51dbb5..4cd1284c96 100644
--- a/src/gi.cpp
+++ b/src/gi.cpp
@@ -260,9 +260,11 @@ void FMapInfoParser::ParseGameInfo()
 		GAMEINFOKEY_CSTRING(finaleFlat, "finaleFlat", 8)
 		GAMEINFOKEY_STRINGARRAY(finalePages, "finalePage", 8)
 		GAMEINFOKEY_STRINGARRAY(infoPages, "infoPage", 8)
+		GAMEINFOKEY_CSTRING(PauseSign, "pausesign", 8)
 		GAMEINFOKEY_STRING(quitSound, "quitSound")
 		GAMEINFOKEY_CSTRING(borderFlat, "borderFlat", 8)
 		GAMEINFOKEY_FIXED(telefogheight, "telefogheight")
+		GAMEINFOKEY_FIXED(gibfactor, "gibfactor")
 		GAMEINFOKEY_INT(defKickback, "defKickback")
 		GAMEINFOKEY_CSTRING(SkyFlatName, "SkyFlatName", 8)
 		GAMEINFOKEY_STRING(translator, "translator")
@@ -275,6 +277,7 @@ void FMapInfoParser::ParseGameInfo()
 		GAMEINFOKEY_BOOL(noloopfinalemusic, "noloopfinalemusic")
 		GAMEINFOKEY_BOOL(drawreadthis, "drawreadthis")
 		GAMEINFOKEY_BOOL(intermissioncounter, "intermissioncounter")
+		GAMEINFOKEY_BOOL(nightmarefast, "nightmarefast")
 		GAMEINFOKEY_COLOR(dimcolor, "dimcolor")
 		GAMEINFOKEY_FLOAT(dimamount, "dimamount")
 		GAMEINFOKEY_INT(definventorymaxamount, "definventorymaxamount")
diff --git a/src/gi.h b/src/gi.h
index df50060a9a..483b4a1b0e 100644
--- a/src/gi.h
+++ b/src/gi.h
@@ -75,6 +75,7 @@ struct gameinfo_t
 	bool drawreadthis;
 	bool noloopfinalemusic;
 	bool intermissioncounter;
+	bool nightmarefast;
 	TArray<FName> creditPages;
 	TArray<FName> finalePages;
 	TArray<FName> infoPages;
@@ -92,6 +93,7 @@ struct gameinfo_t
 	char SkyFlatName[9];
 	char ArmorIcon1[9];
 	char ArmorIcon2[9];
+	char PauseSign[9];
 	char Endoom[9];
 	fixed_t Armor2Percent;
 	FString quitSound;
@@ -120,6 +122,7 @@ struct gameinfo_t
 	FName mFontColorHighlight;
 	FName mFontColorSelection;
 	char mBackButton[9];
+	fixed_t gibfactor;
 
 	const char *GetFinalePage(unsigned int num) const;
 };
diff --git a/src/p_enemy.cpp b/src/p_enemy.cpp
index 1a3de085af..378aaae9dd 100644
--- a/src/p_enemy.cpp
+++ b/src/p_enemy.cpp
@@ -2166,10 +2166,13 @@ void A_DoChase (AActor *actor, bool fastchase, FState *meleestate, FState *missi
 
 	if (nightmarefast && G_SkillProperty(SKILLP_FastMonsters))
 	{ // Monsters move faster in nightmare mode
-		actor->tics -= actor->tics / 2;
-		if (actor->tics < 3)
+		if (actor->tics > 3)
 		{
-			actor->tics = 3;
+			actor->tics -= actor->tics / 2;
+			if (actor->tics < 3)
+			{
+				actor->tics = 3;
+			}
 		}
 	}
 
@@ -2648,7 +2651,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_Chase)
 	}
 	else // this is the old default A_Chase
 	{
-		A_DoChase (self, false, self->MeleeState, self->MissileState, true, !!(gameinfo.gametype & GAME_Raven), false);
+		A_DoChase (self, false, self->MeleeState, self->MissileState, true, gameinfo.nightmarefast, false);
 	}
 }
 
@@ -2660,7 +2663,7 @@ DEFINE_ACTION_FUNCTION(AActor, A_FastChase)
 DEFINE_ACTION_FUNCTION(AActor, A_VileChase)
 {
 	if (!P_CheckForResurrection(self, true))
-		A_DoChase (self, false, self->MeleeState, self->MissileState, true, !!(gameinfo.gametype & GAME_Raven), false);
+		A_DoChase (self, false, self->MeleeState, self->MissileState, true, gameinfo.nightmarefast, false);
 }
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_ExtChase)
@@ -2680,7 +2683,7 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_ExtChase)
 // for internal use
 void A_Chase(AActor *self)
 {
-	A_DoChase (self, false, self->MeleeState, self->MissileState, true, !!(gameinfo.gametype & GAME_Raven), false);
+	A_DoChase (self, false, self->MeleeState, self->MissileState, true, gameinfo.nightmarefast, false);
 }
 
 //=============================================================================
diff --git a/src/p_interaction.cpp b/src/p_interaction.cpp
index d4db864361..93bb0c4412 100644
--- a/src/p_interaction.cpp
+++ b/src/p_interaction.cpp
@@ -318,20 +318,10 @@ void ClientObituary (AActor *self, AActor *inflictor, AActor *attacker)
 //
 EXTERN_CVAR (Int, fraglimit)
 
-static int GibHealth(AActor *actor)
-{	
-	return -abs(
-		actor->GetClass()->Meta.GetMetaInt (
-			AMETA_GibHealth,
-			gameinfo.gametype & GAME_DoomChex ?
-				-actor->SpawnHealth() :
-				-actor->SpawnHealth()/2));		
-}
-
 void AActor::Die (AActor *source, AActor *inflictor)
 {
 	// Handle possible unmorph on death
-	bool wasgibbed = (health < GibHealth(this));
+	bool wasgibbed = (health < GibHealth());
 
 	AActor *realthis = NULL;
 	int realstyle = 0;
@@ -342,7 +332,7 @@ void AActor::Die (AActor *source, AActor *inflictor)
 		{
 			if (wasgibbed)
 			{
-				int realgibhealth = GibHealth(realthis);
+				int realgibhealth = realthis->GibHealth();
 				if (realthis->health >= realgibhealth)
 				{
 					realthis->health = realgibhealth -1; // if morphed was gibbed, so must original be (where allowed)
@@ -670,7 +660,7 @@ void AActor::Die (AActor *source, AActor *inflictor)
 	{
 		int flags4 = inflictor == NULL ? 0 : inflictor->flags4;
 
-		int gibhealth = GibHealth(this);
+		int gibhealth = GibHealth();
 		
 		// Don't pass on a damage type this actor cannot handle.
 		// (most importantly, prevent barrels from passing on ice damage.)
diff --git a/src/p_mobj.cpp b/src/p_mobj.cpp
index f12127a750..d1f0345d85 100644
--- a/src/p_mobj.cpp
+++ b/src/p_mobj.cpp
@@ -5509,6 +5509,11 @@ int AActor::TakeSpecialDamage (AActor *inflictor, AActor *source, int damage, FN
 	return (death == NULL) ? -1 : damage;
 }
 
+int AActor::GibHealth()
+{
+	return -abs(GetClass()->Meta.GetMetaInt (AMETA_GibHealth, FixedMul(SpawnHealth(), gameinfo.gibfactor)));
+}
+
 void AActor::Crash()
 {
 	if (((flags & MF_CORPSE) || (flags6 & MF6_KILLED)) &&
@@ -5523,10 +5528,7 @@ void AActor::Crash()
 		}
 		if (crashstate == NULL)
 		{
-			int gibhealth = -abs(GetClass()->Meta.GetMetaInt (AMETA_GibHealth,
-				gameinfo.gametype & GAME_DoomChex ? -SpawnHealth() : -SpawnHealth()/2));
-
-			if (health < gibhealth)
+			if (health < GibHealth())
 			{ // Extreme death
 				crashstate = FindState (NAME_Crash, NAME_Extreme);
 			}
diff --git a/wadsrc/static/language.enu b/wadsrc/static/language.enu
index 5f0eff88e3..dd097672ff 100644
--- a/wadsrc/static/language.enu
+++ b/wadsrc/static/language.enu
@@ -1328,6 +1328,8 @@ TXT_NEED_SILVERKEY = "You need the Silver Key";
 TXT_NEED_BRASSKEY = "You need the Brass Key";
 TXT_NEED_REDCRYSTAL = "You need the Red Crystal";
 TXT_NEED_BLUECRYSTAL = "You need the Blue Crystal";
+TXT_RETAIL_ONLY = "THIS AREA IS ONLY AVAILABLE IN THE RETAIL VERSION OF STRIFE";
+TXT_DOES_NOT_WORK = "That doesn't seem to work";
 
 // Strife Quest messages
 
diff --git a/wadsrc/static/mapinfo/chex.txt b/wadsrc/static/mapinfo/chex.txt
index 0dac3e7c99..2f2d77bf7c 100644
--- a/wadsrc/static/mapinfo/chex.txt
+++ b/wadsrc/static/mapinfo/chex.txt
@@ -53,6 +53,8 @@ gameinfo
 	menufontcolor_selection = "GOLD"
 	menubackbutton = "M_BACK_H"
 	playerclasses = "ChexPlayer"
+	pausesign = "M_PAUSE"
+	gibfactor = 1
 }
 
 skill baby
diff --git a/wadsrc/static/mapinfo/doomcommon.txt b/wadsrc/static/mapinfo/doomcommon.txt
index 2a103d6a9f..a4d12b7c7f 100644
--- a/wadsrc/static/mapinfo/doomcommon.txt
+++ b/wadsrc/static/mapinfo/doomcommon.txt
@@ -53,6 +53,8 @@ gameinfo
 	menufontcolor_selection = "BRICK"
 	menubackbutton = "M_BACK_D"
 	playerclasses = "DoomPlayer"
+	pausesign = "M_PAUSE"
+	gibfactor = 1
 }
 
 skill baby
diff --git a/wadsrc/static/mapinfo/heretic.txt b/wadsrc/static/mapinfo/heretic.txt
index e6876ab2cc..1596f45d81 100644
--- a/wadsrc/static/mapinfo/heretic.txt
+++ b/wadsrc/static/mapinfo/heretic.txt
@@ -52,6 +52,9 @@ gameinfo
 	menufontcolor_selection = "DARKGREEN"
 	menubackbutton = "M_BACK_H"
 	playerclasses = "HereticPlayer"
+	nightmarefast = true
+	pausesign = "PAUSED"
+	gibfactor = 0.5
 }
 
 skill baby
diff --git a/wadsrc/static/mapinfo/hexen.txt b/wadsrc/static/mapinfo/hexen.txt
index 46682b56f3..af6528699b 100644
--- a/wadsrc/static/mapinfo/hexen.txt
+++ b/wadsrc/static/mapinfo/hexen.txt
@@ -50,6 +50,9 @@ gameinfo
 	menufontcolor_selection = "BRICK"
 	menubackbutton = "M_BACK_X"
 	PlayerClasses = "FighterPlayer", "ClericPlayer", "MagePlayer"
+	nightmarefast = true
+	pausesign = "PAUSED"
+	gibfactor = 0.5
 }
 
 skill baby
diff --git a/wadsrc/static/mapinfo/strife.txt b/wadsrc/static/mapinfo/strife.txt
index edfe798e64..8595c56c96 100644
--- a/wadsrc/static/mapinfo/strife.txt
+++ b/wadsrc/static/mapinfo/strife.txt
@@ -53,6 +53,8 @@ gameinfo
 	menufontcolor_selection = "GOLD"
 	menubackbutton = "M_BACK_S"
 	PlayerClasses = "StrifePlayer"
+	pausesign = "PAUSED"
+	gibfactor = 0.5
 }
 
 skill baby