Combo

Combos are bonuses that exist in certain games which reward multiple line clears in quick succession. The exact conditions for triggering combos, and the amount of importance assigned to them, vary from game to game.

General strategy
By leaving two columns open, one can clear combos easily. However, an I tetromino cannot clear a line in this case, so the Hold box should contain a non I piece, if the game allows, or the bottom of the funnel should be 1 cell wide.

Various skimming methods can end up in combos.

Games with combos in their rules

 * Magical Tetris Challenge
 * Tetris The Grand Master
 * Tetris The Absolute The Grand Master 2
 * Tetris The Absolute The Grand Master 2 PLUS
 * Tetris The Grand Master 3 Terror-Instinct
 * Cultris
 * Tetris Zone
 * Tetris Online (Japan), Minna de Tetris, Tetris 2008, Tetris Sprint, Tetris Dash Called REN in the game.
 * Tetris Splash
 * Tetris Party
 * Tetris Hangame
 * Tetris (iOS)