The game includes a 5 3/4', 4 1/2', by 1 1/2' box that includes a 11' x 17' game map, 3 pages of rules, 55 cut-out U.S. counters, 63 cut-out Japanese counters, 18 flag markers, and a D10. The game is a type of expansion for Axis and Allies, but it might be possible to use this with other games too. An alternative scenario simulates the battle as if the U.S. had not broken the Japanese code.This expansion doesn't seem to be an official expansion.Expands: Axis & Allies - BoardGameGeek