diff --git a/src/level/doomdata.h b/src/level/doomdata.h
index 12b2774..1386988 100644
--- a/src/level/doomdata.h
+++ b/src/level/doomdata.h
@@ -214,8 +214,8 @@ struct MapThing2
 	short		angle;
 	short		type;
 	short		flags;
-	char		special;
-	char		args[5];
+	uint8_t		special;
+	uint8_t		args[5];
 };
 
 struct IntThing
@@ -228,8 +228,8 @@ struct IntThing
 	short		angle;
 	short		type;
 	short		flags;
-	char		special;
-	char		args[5];
+	int			special;
+	int			args[5];
 
 	short pitch; // UDMF
 	float height; // UDMF
diff --git a/src/level/level.cpp b/src/level/level.cpp
index 7ad3a3f..a6e0993 100644
--- a/src/level/level.cpp
+++ b/src/level/level.cpp
@@ -43,7 +43,20 @@ enum
     PO_ANCHOR_TYPE = 9300,
     PO_SPAWN_TYPE,
     PO_SPAWNCRUSH_TYPE,
-	PO_SPAWNHURT_TYPE
+	PO_SPAWNHURT_TYPE,
+	
+	// Thing numbers used to define slopes
+	SMT_VavoomFloor = 1500,
+	SMT_VavoomCeiling = 1501,
+	SMT_VertexFloorZ = 1504,
+	SMT_VertexCeilingZ = 1505,
+	SMT_SlopeFloorPointLine = 9500,
+	SMT_SlopeCeilingPointLine = 9501,
+	SMT_SetFloorSlope = 9502,
+	SMT_SetCeilingSlope = 9503,
+	SMT_CopyFloorPlane = 9510,
+	SMT_CopyCeilingPlane = 9511,
+	
 };
 
 FLevel::FLevel ()
diff --git a/src/level/level_udmf.cpp b/src/level/level_udmf.cpp
index 5bc1a95..306fc04 100644
--- a/src/level/level_udmf.cpp
+++ b/src/level/level_udmf.cpp
@@ -171,9 +171,6 @@ void FProcessor::ParseThing(IntThing *th)
 		const char *value;
 		const char *key = ParseKey(value);
 
-		// The only properties we need from a thing are
-		// x, y, angle and type.
-
 		if (!stricmp(key, "x"))
 		{
 			th->x = CheckFixed(key);
@@ -196,7 +193,31 @@ void FProcessor::ParseThing(IntThing *th)
 		}
 		if (!stricmp(key, "height"))
 		{
-			th->height = CheckFloat(key);
+			th->height = CheckInt(key);
+		}
+		if (!stricmp(key, "special"))
+		{
+			th->special = CheckInt(key);
+		}
+		if (!stricmp(key, "arg0"))
+		{
+			th->args[0] = CheckInt(key);
+		}
+		if (!stricmp(key, "arg1"))
+		{
+			th->args[1] = CheckInt(key);
+		}
+		if (!stricmp(key, "arg2"))
+		{
+			th->args[2] = CheckInt(key);
+		}
+		if (!stricmp(key, "arg3"))
+		{
+			th->args[3] = CheckInt(key);
+		}
+		if (!stricmp(key, "arg4"))
+		{
+			th->args[4] = CheckInt(key);
 		}
 
 		// now store the key in its unprocessed form