Rotation Rules
The basic rotation rule of TGM is identical to Sega's Japanese arcade version of Tetris, as most of the rule details of TGM are derived from Sega Tetris. It is unique in that no single center of rotation exists; instead, the J, L, S, T, and Z Tetriminos rotate so that the lowest grid block is always of the same height.
One difference from Sega's Tetris is the existence of rotation compensation, also called "wall kick". This applies a slight nudge to a Tetriminos in some cases where rotating it would bump into a wall. First it will try to move the piece one cell right, and then if that fails, one cell left. If both fail, rotation will not work.
Read more about this topic: Tetris: The Grand Master
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