Via a Joystiq post, the British Gaming Blog has videos of Tetris on the DS. The short movies include the standard mode, and the 'push mode' that will be playable over Nintendo's wifi service. From the Joystiq post: "As for the ingenious Donkey Kong-themed Push mode, it seems ideally suited for Wi-Fi multiplayer battles. Each player is relegated to one of the DS screens, with the opponent being mirrored in the bottom screen (i.e. his blocks move upwards). Each player slots Tetrominoes into a cluster of blocks that's initially right in the middle of the two playing fields. Performing well and racking up combos pushes the block cluster away and into your opponent's screen, lessening his maneuvering space and chances of survival. "