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| A '''tetromino''' is a [[polyomino]] or block made of four square blocks.
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| The seven one-sided tetrominoes are ''I'', ''O'', ''T'', ''S'', ''Z'', ''J'', and ''L''.
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| The spelling "tetromino" is standard among mathematicians.
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| [[The Tetris Company]] had preferred '''tetramino''' around 1999 and has used '''Tetrimino''' since 2001.
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| == The basic tetrominoes ==
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| Each tetromino has a letter name and several alternative names.
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| In most games other than [[Tetris (NES, Nintendo)|''Tetris'' for NES]], ''[[Tetris & Dr. Mario]]'', or black-and-white systems, each tetromino has a different color. However, before about 2001, these colors varied from product to product, making it difficult for people who play different games to discuss "the blue piece". Since then, the color schemes associated with [[SRS]] and [[TGM Rotation]] have dominated new games, and "the blue piece" is always J.
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| ===''I''===
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| Other names include ''straight'', ''stick'', and ''long''. This is the only tetromino that can [[Line clear#Tetris|clear four lines]] outside of [[cascade]] games.
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| {{pfstart}}
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| {{width4row|aT|aT|aT|aT|}}
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| {{width4row| | | | |}}
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| {{pfend}}
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| ===''O''===
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| Other names include ''square'', ''block'' and ''sun''.
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| {{pfstart}}
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| {{width4row| |aO|aO| |}}
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| {{width4row| |aO|aO| |}}
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| {{pfend}}
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| ===''T''===
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| This piece is used for [[T-Spin]]s.
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| {{pfstart}}
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| {{width4row| |aS|aS|aS|}}
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| {{width4row| | |aS| |}}
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| {{pfend}}
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| ===''S''===
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| Other names include ''inverse skew'' and ''right snake''.
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| {{pfstart}}
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| {{width4row| | |aZ|aZ|}}
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| {{width4row| |aZ|aZ| |}}
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| {{pfend}}
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| ===''Z''===
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| Other names include ''skew'', ''reverse S'' and ''left snake''.
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| {{pfstart}}
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| {{width4row|aI|aI| | |}}
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| {{width4row| |aI|aI| |}}
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| {{pfend}}
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| ===''J''===
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| Other names include ''gamma'', ''inverse L'', ''reverse L'', or ''left gun''.
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| {{pfstart}}
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| {{width4row|aJ|aJ|aJ| |}}
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| {{width4row| | |aJ| |}}
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| {{pfend}}
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| ===''L''===
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| Other names include ''right gun''.
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| {{pfstart}}
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| {{width4row| |aL|aL|aL|}}
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| {{width4row| |aL| | |}}
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| {{pfend}}
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| == Multimino ==
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| In ''[[The Next Tetris]]'', Sticky mode of ''[[Tetris Worlds]]'' and ''[[Tetris Mania]]'', and ''[[Jewelry Master]]'', some tetrominoes are ''multiminoes,'' that is, the Tetrimino itself is divided into visible components.
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| Though the Tetrimino is moved and [[rotate]]d as a unit, once it [[Drop|locks]], the components separate by colors and fall.
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| ==See also==
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| *[[Piece]]
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| *[[Orientation]]
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| ==External links==
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| *''[http://www.mariowiki.com/Tetrimino Tetrimino]'' at the Super Mario Wiki
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| *[http://mathworld.wolfram.com/Tetromino.html Mathworld]
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| *[http://en.wikipedia.org/wiki/Tetromino Wikipedia:Tetromino]
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| *[http://www.arkmay.com/tetris/pieces.html The Tetris Taxonomy: The Pieces] (Adult audience)
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| [[Category:Interface]]
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| [[Category:NIWA]]
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