diff --git a/source/core/g_mapinfo.cpp b/source/core/g_mapinfo.cpp
index 5e5a38d6591..a0dadc7f8d4 100644
--- a/source/core/g_mapinfo.cpp
+++ b/source/core/g_mapinfo.cpp
@@ -317,15 +317,15 @@ bool FMapInfoParser::CheckLegacyMapDefinition(FString& mapname)
 			sc.MustGetNumber();
 			int indx = sc.Number;
 			auto map = FindMapByIndexOnly(vol, indx);
-			if (!map) I_Error("Map {%d, %d} does not exist", vol, indx);
-			mapname = map->labelName;
+			if (!map) mapname = "";
+			else mapname = map->labelName;
 		}
 		else
 		{
 			// SW only uses the level number
 			auto map = FindMapByLevelNum(vol);
-			if (!map) I_Error("Map {%d} does not exist", vol);
-			mapname = map->labelName;
+			if (!map) mapname = "";
+			else mapname = map->labelName;
 		}
 		sc.MustGetStringName("}");
 		return true;
@@ -744,23 +744,32 @@ static int GetDefaultLevelNum(const char *mapname)
 // Parses the header of a map definition ('map mapxx mapname')
 //
 //==========================================================================
+static MapRecord sink;
 
 MapRecord *FMapInfoParser::ParseMapHeader(MapRecord &defaultinfo)
 {
 	FString mapname;
+	MapRecord* map;
 
 	if (!CheckLegacyMapDefinition(mapname))
 	{
 		ParseLookupName(mapname);
 	}
 
-	auto map = FindMapByName(mapname);
-	if (!map)
+	if (mapname.IsEmpty())
 	{
-		map = AllocateMap();
-		*map = defaultinfo;
-		DefaultExtension(mapname, ".map");
-		map->SetFileName(mapname);
+		map = &sink; // parse over the entire definition but discard the result.
+	}
+	else
+	{
+		map = FindMapByName(mapname);
+		if (!map)
+		{
+			map = AllocateMap();
+			*map = defaultinfo;
+			DefaultExtension(mapname, ".map");
+			map->SetFileName(mapname);
+		}
 	}
 
 	if (!sc.CheckString("{"))
@@ -770,7 +779,7 @@ MapRecord *FMapInfoParser::ParseMapHeader(MapRecord &defaultinfo)
 	}
 	else
 	{
-		if (map->name.IsEmpty()) sc.ScriptError("Missing level name");
+		if (map != &sink && map->name.IsEmpty()) sc.ScriptError("Missing level name");
 		sc.UnGet();
 	}
 	map->levelNumber = GetDefaultLevelNum(map->labelName);
diff --git a/wadsrc/static/filter/redneck.route66/engine/rmapinfo.txt b/wadsrc/static/filter/redneck.route66/engine/rmapinfo.txt
new file mode 100644
index 00000000000..59246e710af
--- /dev/null
+++ b/wadsrc/static/filter/redneck.route66/engine/rmapinfo.txt
@@ -0,0 +1,109 @@
+// Cutscene definitions for RRR66. This is a little bit different than the main game.
+
+cluster 2
+{
+	outro
+	{
+		function = RRCutscenes.BuildE2End
+	}
+}
+
+map { 1, 1 }
+{
+	interbackground = "BONUSPIC01"
+	rr_startsound = 391	// fixme: allow symbolic names 
+}
+
+map { 1, 2 }
+{
+	interbackground = "BONUSPIC02"
+	rr_startsound = 64
+}
+
+map { 1, 3 }
+{
+	interbackground = "BONUSPIC03"
+	rr_startsound = 77
+}
+
+map { 1, 4 }
+{
+	interbackground = "BONUSPIC04"
+	rr_startsound = 80
+}
+
+map { 1, 5 }
+{
+	interbackground = "BONUSPIC05"
+	rr_startsound = 102
+}
+
+map { 1, 6 }
+{
+	interbackground = "BONUSPIC06"
+	rr_startsound = 103
+}
+
+map { 1, 7 }
+{
+	interbackground = "BONUSPIC07"
+	rr_startsound = 104
+}
+
+map { 2, 1 }
+{
+	interbackground = "BONUSPIC08"
+	rr_startsound = 105
+}
+
+map { 2, 2 }
+{
+	interbackground = "BONUSPIC09"
+	rr_startsound = 176
+	clearweapons
+}
+
+map { 2, 3 }
+{
+	interbackground = "BONUSPIC10"
+	rr_startsound = 177
+}
+
+map { 2, 4 }
+{
+	interbackground = "BONUSPIC11"
+	rr_startsound = 198
+}
+
+map { 2, 5 }
+{
+	interbackground = "BONUSPIC12"
+	rr_startsound = 230
+}
+
+map { 2, 6 }
+{
+	interbackground = "BONUSPIC13"
+	rr_startsound = 255
+}
+
+map { 2, 7 }
+{
+	interbackground = "BONUSPIC14"
+	rr_startsound = 283
+	PrecacheTextures = "UFO1", "UFO2", "UFO3", "UFO4", "UFO5"
+}
+
+cutscenes
+{
+	loadscreen
+	{
+		function = DukeCutscenes.BuildLoading // identical with Duke's
+	}
+}
+
+gameinfo
+{
+	summaryscreen = RRCutscenes.BuildSPSummary
+	mpsummaryscreen = DukeCutscenes.BuildMPSummary // identical with Duke's 
+}