Penultimate Inc. improves upon its popular chess game with a faster chess engine, additional difficulty levels, and an unlimited undo feature. Select phones also feature optional music, voice, and sound effects to further enhance game play. The opening book contains over 2000 randomly-selected openings, ensuring a wide range of game situations. Unfinished game positions are automatically saved upon exit, and can be quickly resumed later. A two-player mode permits head-to-head competition against a friend on the same phone.