Colossus Bridge 4 is a bridge game for a single player (computer playing the other 3 hands, demo mode available). The game uses the Acol bidding system and Blackwood, Stayman, and Baron conventions, also supported are take-out doubles and the strong 2 club. Other features include hand input, save/load, rebid/replay, backstep, card autoplay/recommendation and cheat option. The game was packed with introductory book Begin Bridge by Geoffrey C.H. Fox