Tetris S

Tetris S is a game created by Sega for the Sega Saturn. This game contains 3 basic modes: Classic, VS. CPU, and VS. opponent.

In multiplayer, attacks don't send garbage. instead they speed up your opponent's blocks. When a large amount of lines is cleared, the speedup becomes longer and faster, with a tetris giving about 5 tetrominos worth of super fast drop.