new Crossroads variant: thematic crossroads

classes.cpp

@@ -420,6 +420,9 @@ const char *ruindesc =
 const char *rock_description = 
   "Shoot the Space Rocks for score. Large Rocks will split into two smaller rocks.";
 
+const char *thematic_crossroads =
+  "The Thematic Crossroads has various sections that connect to lands with specific theme.";
+
 #if HDR
 enum eSlimegroup { sgNone, sgCave, sgWater, sgFloorA, sgFloorB, sgVine, sgTree };
 #endif