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Wall kick

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A wall kick happens when a player rotates a piece when no space exists in the squares where that tetromino would normally occupy after the rotation. To compensate, the game sets a certain number of alternative spaces for the tetromino to look. Wall kicks started appearing in games because after a piece would be backed up against the wall, it would awkwardly be unable to rotate until first moving back.

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TetTetTetTetTetTetTetTetTetTet
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TetTetTetTetTetTetTetTetTetTet
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TetGTetGTetGTetGTetGTetGTetGTetGTetGTet

Here T can rotate

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TetTetGTetGTetGTetTetGTetGTetGTetGTet
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Here T cannot rotate without a wall kick

The simplest wall kick algorithm, used (with variations) by TGM rotation and several fan games in the same tradition, is to try moving the tetromino one space to the right, and then one space to the left, and fail if neither can be done. Wall kicks increase the number of possible twists.

Other notable rotation systems that include wall kick and/or floor kick include the following:

Data tables describing systems for a number of Tetris games exist in the source code of several fan games, such as Heboris Unofficial Expansion, syoboris or Lockjaw.

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