Tetris Multiplayer contains all the standard single-player Tetris action, as well as new multiplayer functionality. Players can choose to play against friends or let the system select a worthy opponent. Dueling pairs can block one another's efforts to clear lines and play on one of two multiplayer modes - "Ultra" allows gamers to race each other on a two-minute clock and "Forty Line" challenges them to clear 40 lines before their opponent.