For many years the only available version had a corrupted set of maps. Thought to be a full 21-level map set, only 10 levels have managed to survive the corrupted files. Andy Nonymous salvaged all possible maps and re-released them in November 2009.
A map set, it can be played in sourceports. However, as the remaining 11 levels are lost, the map file only features 10 level slots, causing the mod to crash when exiting to a secret level or the elevator in level 10.