Nintendo Rotation System
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This rotation system was used in early Nintendo titles, and can also be found in various clones. Games using this rotation system generally have no wall kick and no lock delay.
Later Tetris games published by Nintendo (Tetris DX, The New Tetris, and Tetris DS) use different rotation systems.
This version was used in Tetris (NES, Nintendo) and Tetris & Dr. Mario. Tetrominoes spawn with their highest block on row 20.
This version was used in Tetris (Game Boy). Tetrominoes enter with their highest block on row 17.