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| For '''more advanced players''', please go here: '''[http://harddrop.com/wiki/Category:T-Spin_Methods T-Spin Methods]'''.
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| Some games give scoring rewards for twisting a tetromino into a tight space. When this is done with a T tetromino, it is called a '''T-spin'''.
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| Two basic algorithms, with slight variations, have been used in newer games to detect and reward in-place spins:
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| *Immobile, used in ''[[The New Tetris]]'': A twist is recognised if a tetromino locks in a position where it cannot move left, right, or up. There is only [[The_New_Tetris#Twist_reward|a reward]] if rows are completed in this way. Example:
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| {|
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| |{{pfstart}}
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| {{pfrow| | | | | | |g|g| | }}
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| {{pfrow|g|g|g|g| | | |g|g|g}}
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| {{pfrow|g|g|g|g| | |g|g|g|g}}
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| {{pfend}}
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| Immobile T-slot
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| |{{pfstart}}
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| {{pfrow| | | | | |t|g|g| | }}
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| {{pfrow|g|g|g|g|t|t| |g|g|g}}
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| {{pfrow|g|g|g|g| |t|g|g|g|g}}
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| {{pfend}}
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| Entry
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| |{{pfstart}}
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| {{pfrow| | | | | | |g|g| | }}
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| {{pfrow|g|g|g|g|t|t|t|g|g|g}}
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| {{pfrow|g|g|g|g| |t|g|g|g|g}}
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| {{pfend}}
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| Rotated to a position of immobility, and a row will clear
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| |}
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| *3-corner T, used in ''[[Tetris DS]]'' and other [[SRS]] based games: A T-spin bonus is awarded if all of the following are true:<sup>[http://web.archive.org/web/1/http://www.tetrisconcept.com/forum/viewtopic.php?t=78]</sup>
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| *#Tetromino being locked is T.
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| *#Last successful movement of the tetromino was a rotate, as opposed to sideways movement, downward movement, or falling due to gravity. (Canceling lock delay in games that allow it, such as Tetris DS, does not count as a movement.) The tetromino doesn't even have to end up in a different orientation than it was dropped in; setting up the "well-known twist" below in ''Tetris Worlds'' or ''Tetris DS'' and pressing both rotate buttons (B–A or A–B) will trigger the T-spin bonus even without any net rotation.
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| *#Three of the 4 squares diagonally adjacent to the T's center are occupied. In ''Tetris DS'', the walls and floor surrounding the playfield are considered "occupied", while in ''[[Tetris Worlds]]'' for GBA, they aren't. Example:
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| {|
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| |{{pfstart}}
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| {{pfrow| | | | | | |g|g| | }}
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| {{pfrow|g|g|g|g| | | |g|g|g}}
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| {{pfrow|g|g|g|g|g| |g|g|g|g}}
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| {{pfend}}
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| 3-corner T-slot
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| |{{pfstart}}
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| {{pfrow| | | | | |t|g|g| | }}
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| {{pfrow|g|g|g|g|t|C| |g|g|g}}
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| {{pfrow|g|g|g|g|g|t|g|g|g|g}}
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| {{pfend}}
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| Entry
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| |{{pfstart}}
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| {{pfrow| | | | | | |B|g| | }}
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| {{pfrow|g|g|g|g|t|C|t|g|g|g}}
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| {{pfrow|g|g|g|g|B|t|B|g|g|g}}
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| {{pfend}}
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| Rotated and 3 corners are occupied in the 3x3 box which contains the T
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| |}
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| [[Guideline compliant game differences|Different games]] add further restrictions:
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| *3-corner T no wall, used in ''[[Tetris Worlds]]'': The walls and floor surrounding the playfield are not considered "occupied". This means that if a wall kick places the T tetromino with its flat side against the wall or floor, the T-spin will not be recognized. (Kicks that place the flat side against blocks in the playfield still work.)
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| *3-corner T no kick, used in ''[[Tetris: New Century]]'', ''[[iPod Tetris]]'', ''[[Tetris Evolution]]'', and most other official guideline games released after 2006: The final rotation must not involve a wall kick, that is, it recognizes only the "well known twist" below.
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| *[[Tetris Zone]] recognises T-spins that involve a wallkick, but will not recognise any T-spin that results in a triple.
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| == Rewards ==
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| Rewards for T-spins first appeared in ''[[The New Tetris]]''. The game added a reward for T-spins (and for twists involving other pieces), which would trigger an "avalanche." ''[[Tetrisphere]]'' product coordinator Ken Lobb is credited for inspiring T-spin rewards.<sup>[http://www.digitaltrends.com/gaming/interview-with-the-tetris-company-creators-alexei-pajitnov-and-henk-rogers/]</sup> [[Henk Rogers]] implied that it was the mobile game ''[[Tetris Battle]]'' that inspired the T-Spin's current dominating points and garbage rewards<sup>[http://www.nintendoworldreport.com/interview/11267/tetris-from-the-top-an-interview-with-henk-rogers]</sup>, although T-Spins in a nerfed form found their way into prior guideline games such as ''[[Tetris Worlds]]''. As of 2015, the [[Tetris Guideline]] seems to favor T-spins that involve a wallkick.
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| A couple of 3-corner T no kick rulings variations:
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| {|
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| |{{pfstart}}
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| {{pfrow| | | | | |t|g|g| | }}
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| {{pfrow|g|g|g|g|t|C| |g|g|g}}
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| {{pfrow|g|g|g|g|g|t|g|g|g|g}}
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| {{pfend}}
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| Soft drop
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| |{{pfstart}}
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| {{pfrow| | | | | | |g|g| | }}
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| {{pfrow|g|g|g|g|t|C|t|g|g|g}}
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| {{pfrow|g|g|g|g|g|t|g|g|g|g}}
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| {{pfend}}
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| Rotate left
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| |}
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| {|
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| |{{pfstart}}
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| {{pfrow| | | | | |t|g|g| | }}
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| {{pfrow| | | | |t|C| |g|g|g}}
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| {{pfrow|g|g|g|g|g|t|g|g|g|g}}
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| {{pfend}}
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| Soft drop
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| |{{pfstart}}
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| {{pfrow| | | | | | |g|g| | }}
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| {{pfrow| | | | |t|C|t|g|g|g}}
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| {{pfrow|g|g|g|g|g|t|g|g|g|g}}
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| {{pfend}}
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| Rotate once
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| |{{pfstart}}
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| {{pfrow| | | | | |t|g|g| | }}
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| {{pfrow| | | | | |C|t|g|g|g}}
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| {{pfrow|g|g|g|g|g|t|g|g|g|g}}
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| {{pfend}}
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| Or twice
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| |}
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| ==See Also==
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| [[Category:Mobility]]
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| [[Category:Scoring Systems]]
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