D-DAY was completely revised in 1977 to incorporate the latest simulation design innovations including Strategic Movement, Air Interdiction, and Tactical Airpower. It is an Intermediate 1 level game on the Avalon Hill Complexity Scale for 2 players aged 12 & up with a varying playing time of 1-4 hours. D-DAY belongs to the Avalon Hill family of classic games suitable for play-by-mail in much the same fashion as chess.