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| '''Arika Rotation System''' is a game play mechanic used in ''[[Tetris The Grand Master]]'' and other Arika tetromino games, derived from that of Sega's arcade ''Tetris'' game.
| | #REDIRECT:[[ARS]] |
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| == Colors ==
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| Games using ARS use the following color scheme:
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| *I: red
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| *J: blue
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| *L: orange
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| *O: yellow
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| *S: purple
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| *T: cyan
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| *Z: green
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| == Basic rotation ==
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| :''Illustration goes here. {{User:Tepples|Tepples}} is working on one.
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| Tetrominoes start out centered, rounding to the left. I goes in columns 3–6 counting from the left, O in columns 4–5, and others in columns 4–6.
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| Each tetromino is spawned flat side up unless the player holds down a rotate button while the tetromino is being spawned, in which case it is spawned rotated by one unit (Initial Rotation System).
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| Apart from I and O, all tetrominoes rotate such that the bottom of the piece is at the bottom of the piece's bounding box. S and Z rotate so that the center column stays constant.
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| == Wall kick ==
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| :''Illustration goes here.''
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| Sometimes a rotation is blocked by the walls outside the playfield or by blocks inside the playfield. ARS tries to rotate the tetromino within the box without moving it, then try one space to the right, then try one space to the left, then fail. In TGM3: also try one space up.
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| == References ==
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| *[http://www.tetrisconcept.com/forum/viewtopic.php?p=480#480 colour_thief's explanation of ARS wall kick on the tetrisconcept.com forum]
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| *[http://www13.plala.or.jp/TETRiS_TGM/kouza/index.htm TGM rotations, in Japanese]
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