diff --git a/source/core/gamecontrol.h b/source/core/gamecontrol.h
index 6d6188af9..7f4a48774 100644
--- a/source/core/gamecontrol.h
+++ b/source/core/gamecontrol.h
@@ -99,8 +99,15 @@ enum
 	GAMEFLAG_POWERSLAVE	= 0x00002000,
 	GAMEFLAG_EXHUMED	= 0x00004000,
 	GAMEFLAG_PSEXHUMED  = GAMEFLAG_POWERSLAVE | GAMEFLAG_EXHUMED,	// the two games really are the same, except for the name and the publisher.
-	GAMEFLAG_WORLDTOUR = 0x00008000,
-	GAMEFLAG_DUKEDC = 0x00010000,
+	GAMEFLAG_WORLDTOUR	= 0x00008000,
+	GAMEFLAG_DUKEDC		= 0x00010000,
+	GAMEFLAG_DUKENW		= 0x00020000,
+	GAMEFLAG_DUKEVACA	= 0x00040000,
+	GAMEFLAG_BLOODCP	= 0x00080000,
+	GAMEFLAG_ROUTE66	= 0x00100000,
+	GAMEFLAG_SWWANTON	= 0x00200000,
+	GAMEFLAG_SWTWINDRAG	= 0x00400000,
+
 	GAMEFLAG_DUKECOMPAT = GAMEFLAG_DUKE | GAMEFLAG_NAM | GAMEFLAG_NAPALM | GAMEFLAG_WW2GI | GAMEFLAG_RRALL,
 	GAMEFLAGMASK        = 0x0000FFFF, // flags allowed from grpinfo
 
diff --git a/source/core/searchpaths.cpp b/source/core/searchpaths.cpp
index dd3a73af9..d449adf40 100644
--- a/source/core/searchpaths.cpp
+++ b/source/core/searchpaths.cpp
@@ -398,6 +398,12 @@ static TArray<GrpInfo> ParseGrpInfo(const char *fn, FileReader &fr, TMap<FString
 	FlagMap.Insert("GAMEFLAG_POWERSLAVE", GAMEFLAG_POWERSLAVE);
 	FlagMap.Insert("GAMEFLAG_EXHUMED", GAMEFLAG_EXHUMED);
 	FlagMap.Insert("GAMEFLAG_DUKEDC", GAMEFLAG_DUKEDC);
+	FlagMap.Insert("GAMEFLAG_DUKENW", GAMEFLAG_DUKENW);
+	FlagMap.Insert("GAMEFLAG_DUKEVACA", GAMEFLAG_DUKEVACA);
+	FlagMap.Insert("GAMEFLAG_BLOODCP", GAMEFLAG_BLOODCP);
+	FlagMap.Insert("GAMEFLAG_ROUTE66", GAMEFLAG_ROUTE66);
+	FlagMap.Insert("GAMEFLAG_SWWANTON", GAMEFLAG_SWWANTON);
+	FlagMap.Insert("GAMEFLAG_SWTWINDRAG", GAMEFLAG_SWTWINDRAG);
 
 	FScanner sc;
 	auto mem = fr.Read();
diff --git a/source/games/duke/src/2d_r.cpp b/source/games/duke/src/2d_r.cpp
index 844aad2a8..d64a0e355 100644
--- a/source/games/duke/src/2d_r.cpp
+++ b/source/games/duke/src/2d_r.cpp
@@ -285,23 +285,6 @@ void dobonus_r(int bonusonly, const CompletionFunc& completion)
 }
 
 
-#if 0
-//---------------------------------------------------------------------------
-//
-// 
-//
-//---------------------------------------------------------------------------
-
-
-void loadscreen_r(MapRecord* rec, CompletionFunc func)
-{
-	TArray<DScreenJob*> jobs(1, true);
-
-	jobs[0] = Create<DRRLoadScreen>(rec);
-	RunScreenJob(jobs, func);
-}
-#endif
-
 void PrintPaused_r()
 {
 	BigText(160, 100, GStrings("Game Paused"), 0);
diff --git a/wadsrc/static/engine/grpinfo.txt b/wadsrc/static/engine/grpinfo.txt
index 9f487418b..7c0bc7f73 100644
--- a/wadsrc/static/engine/grpinfo.txt
+++ b/wadsrc/static/engine/grpinfo.txt
@@ -249,7 +249,7 @@ grpinfo
 	name "Duke Caribbean: Life's a Beach"
 	size 22213819
 	crc DUKECB_CRC
-	flags GAMEFLAG_DUKE|GAMEFLAG_ADDON
+	flags GAMEFLAG_DUKE|GAMEFLAG_ADDON|GAMEFLAG_DUKEVACA
 	dependency DUKE15_CRC
 	gamefilter "Duke.Vacation"
 	FgColor 0x00004f
@@ -263,7 +263,7 @@ grpinfo
 	scriptname "VACATION.CON"
 	size 22397273
 	crc 0x65B5F690
-	flags GAMEFLAG_DUKE|GAMEFLAG_ADDON
+	flags GAMEFLAG_DUKE|GAMEFLAG_ADDON|GAMEFLAG_DUKEVACA
 	dependency DUKE15_CRC
 	gamefilter "Duke.Vacation"
 	FgColor 0x00004f
@@ -277,7 +277,7 @@ grpinfo
 	scriptname "NWINTER.CON"
 	size 16169365
 	crc DUKENW_CRC
-	flags GAMEFLAG_DUKE|GAMEFLAG_ADDON
+	flags GAMEFLAG_DUKE|GAMEFLAG_ADDON|GAMEFLAG_DUKENW
 	dependency DUKE15_CRC
 	gamefilter "Duke.NWinter"
 	FgColor 0
@@ -291,7 +291,7 @@ grpinfo
 	scriptname "NWINTER.CON"
 	size 10965909
 	crc 0xC7EFBFA9
-	flags GAMEFLAG_DUKE|GAMEFLAG_ADDON
+	flags GAMEFLAG_DUKE|GAMEFLAG_ADDON|GAMEFLAG_DUKENW
 	dependency DUKE15_CRC
 	gamefilter "Duke.NWinter"
 	FgColor 0
@@ -423,7 +423,7 @@ grpinfo
 	name "BLOOD: Cryptic Passage"
 	scriptname "CRYPTIC.INI"
 	mustcontain "CRYPTIC.INI", "CP01.MAP", "CP02.MAP"
-	flags GAMEFLAG_BLOOD|GAMEFLAG_ADDON
+	flags GAMEFLAG_BLOOD|GAMEFLAG_ADDON|GAMEFLAG_BLOODCP
 	dependency BLOOD_CRC
 	loadart "CPART07.AR_", "CPART15.AR_"
 	gamefilter "Blood.Cryptic"
@@ -436,7 +436,7 @@ addon
 	name "BLOOD: Cryptic Passage"
 	scriptname "CRYPTIC.INI"
 	mustcontain "CRYPTIC.INI", "CP01.MAP", "CP02.MAP"
-	flags GAMEFLAG_BLOOD|GAMEFLAG_ADDON
+	flags GAMEFLAG_BLOOD|GAMEFLAG_ADDON|GAMEFLAG_BLOODCP
 	dependency BLOOD_CRC
 	loadart "CPART07.AR_", "CPART15.AR_"
 	gamefilter "Blood.Cryptic"
@@ -450,7 +450,7 @@ addon
 	scriptname "CRYPTIC.INI"
 	mustcontain "cryptic/CRYPTIC.INI", "cryptic/CP01.MAP", "cryptic/CP02.MAP"
 	loadgrp "cryptic"
-	flags GAMEFLAG_BLOOD|GAMEFLAG_ADDON
+	flags GAMEFLAG_BLOOD|GAMEFLAG_ADDON|GAMEFLAG_BLOODCP
 	dependency BLOOD_CRC
 	loadart "CPART07.AR_", "CPART15.AR_"
 	gamefilter "Blood.Cryptic"
@@ -464,7 +464,7 @@ addon
 	scriptname "CRYPTIC.INI"
 	mustcontain "addons/Cryptic Passage/CRYPTIC.INI", "addons/Cryptic Passage/CP01.MAP", "addons/Cryptic Passage/CP02.MAP"
 	loadgrp "addons/Cryptic Passage"
-	flags GAMEFLAG_BLOOD|GAMEFLAG_ADDON
+	flags GAMEFLAG_BLOOD|GAMEFLAG_ADDON|GAMEFLAG_BLOODCP
 	dependency BLOOD_CRC
 	gamefilter "Blood.Cryptic"
 	GameID "CrypticPassage"
@@ -573,7 +573,7 @@ grpinfo
 grpinfo
 {
 	name "Shadow Warrior: Wanton Destruction"
-	flags GAMEFLAG_SW|GAMEFLAG_ADDON
+	flags GAMEFLAG_SW|GAMEFLAG_ADDON|GAMEFLAG_SWWANTON
 	crc SWWD_CRC
 	size 48698128
 	defname "sw.def"
@@ -585,7 +585,7 @@ grpinfo
 grpinfo
 {
 	name "Shadow Warrior: Wanton Destruction"
-	flags GAMEFLAG_SW|GAMEFLAG_ADDON
+	flags GAMEFLAG_SW|GAMEFLAG_ADDON|GAMEFLAG_SWWANTON
 	crc 0x8B6E8011
 	size 48698128
 	defname "sw.def"
@@ -597,7 +597,7 @@ grpinfo
 grpinfo
 {
 	name "Shadow Warrior: Wanton Destruction (ProAsm)"
-	flags GAMEFLAG_SW|GAMEFLAG_ADDON
+	flags GAMEFLAG_SW|GAMEFLAG_ADDON|GAMEFLAG_SWWANTON
 	crc 0x39893EF4
 	size 9562689
 	defname "sw.def"
@@ -610,7 +610,7 @@ grpinfo
 grpinfo
 {
 	name "Shadow Warrior: Twin Dragon"
-	flags GAMEFLAG_SW|GAMEFLAG_ADDON
+	flags GAMEFLAG_SW|GAMEFLAG_ADDON|GAMEFLAG_SWTWINDRAG
 	crc SWTD_CRC
 	size 12499012
 	defname "twindrag.def"
@@ -623,7 +623,7 @@ grpinfo
 grpinfo
 {
 	name "Shadow Warrior: Twin Dragon"
-	flags GAMEFLAG_SW|GAMEFLAG_ADDON
+	flags GAMEFLAG_SW|GAMEFLAG_ADDON|GAMEFLAG_SWTWINDRAG
 	crc 0xB5B71277
 	size 6236287
 	defname "twindrag.def"
@@ -635,7 +635,7 @@ grpinfo
 grpinfo
 {
 	name "Shadow Warrior: Twin Dragon"
-	flags GAMEFLAG_SW|GAMEFLAG_ADDON
+	flags GAMEFLAG_SW|GAMEFLAG_ADDON|GAMEFLAG_SWTWINDRAG
 	crc 0xACC8DCDE
 	size 6235578
 	defname "twindrag.def"
@@ -678,7 +678,7 @@ grpinfo
 	name "Redneck Rampage: Suckin' Grits on Route 66"
 	scriptname "GAME66.CON"
 	mustcontain "TILESA66.ART", "TILESB66.ART", "ROUTE66/CARNIVAL.MAP", "ROUTE66/TRUCKSTP.MAP", "GAME66.CON"
-	flags GAMEFLAG_RR|GAMEFLAG_ADDON
+	flags GAMEFLAG_RR|GAMEFLAG_ADDON|GAMEFLAG_ROUTE66
 	dependency RR_CRC
 	loadart "TILESA66.ART", "TILESB66.ART" // replaces TILES009 and TILES023.
 	gamefilter "Redneck.Route66"
@@ -692,7 +692,7 @@ addon
 	name "Redneck Rampage: Suckin' Grits on Route 66"
 	scriptname "GAME66.CON"
 	mustcontain "TILESA66.ART", "TILESB66.ART", "ROUTE66/CARNIVAL.MAP", "ROUTE66/TRUCKSTP.MAP", "GAME66.CON"
-	flags GAMEFLAG_RR|GAMEFLAG_ADDON
+	flags GAMEFLAG_RR|GAMEFLAG_ADDON|GAMEFLAG_ROUTE66
 	dependency RR_CRC
 	loadart "TILESA66.ART", "TILESB66.ART" // replaces TILES009 and TILES023.
 	gamefilter "Redneck.Route66"
diff --git a/wadsrc/static/zscript/razebase.zs b/wadsrc/static/zscript/razebase.zs
index 9ca6c734f..a7dcd3254 100644
--- a/wadsrc/static/zscript/razebase.zs
+++ b/wadsrc/static/zscript/razebase.zs
@@ -17,8 +17,14 @@ enum EGameType
 	GAMEFLAG_POWERSLAVE	= 0x00002000,
 	GAMEFLAG_EXHUMED	= 0x00004000,
 	GAMEFLAG_PSEXHUMED  = GAMEFLAG_POWERSLAVE | GAMEFLAG_EXHUMED,	// the two games really are the same, except for the name and the publisher.
-	GAMEFLAG_WORLDTOUR = 0x00008000,
-	GAMEFLAG_DUKEDC = 0x00010000,
+	GAMEFLAG_WORLDTOUR	= 0x00008000,
+	GAMEFLAG_DUKEDC		= 0x00010000,
+	GAMEFLAG_DUKENW		= 0x00020000,
+	GAMEFLAG_DUKEVACA	= 0x00040000,
+	GAMEFLAG_BLOODCP	= 0x00080000,
+	GAMEFLAG_ROUTE66	= 0x00100000,
+	GAMEFLAG_SWWANTON	= 0x00200000,
+	GAMEFLAG_SWTWINDRAG	= 0x00400000,
 	GAMEFLAGMASK        = 0x0000FFFF, // flags allowed from grpinfo
 
 	// We still need these for the parsers.