In 1998 Big Time Software negotiated with Avalon Hill to do a computerized version of "Advanced Squad Leader", but plans fell through. Big Time Software went on to produce Combat Mission: Beyond Overlord, which was a 3D tactical computer game very similar to "Advanced Squad Leader" but with significant differences. While lacking much of the arcane detail of ASL (you could not swim, climb cliffs, or descend onto the battlefield by parachute), it also featured an innovative simultaneous turn-based system, and provided complete orders of battle for German, American, British, Canadian, Free French and Polish forces in Northwest Europe from 6 June 1944 to 8 May 1945.