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[[Image:ARS-pieces.png|thumb|All rotation states of all seven tetrominoes. From top to bottom: I, J, L, S, T, Z. Top right: O.]]
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'''Sega Rotation''' is the [[rotation system]] used by [[Sega]] from Sega's [[Tetris (Sega)|1988 Tetris arcade game]] until 1999, in ''[[Sega Tetris]]''. Aside from Sega games, this rotation system was used as a basis for rotation in many other Japanese ''Tetris'' games.
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== Basic rotation ==
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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. Each tetromino starts with its topmost solid block in row 20.
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Each tetromino is ordinarily spawned flat side up. There is no initial rotation and no wallkicks. Additionally, the ceiling prevents rotation.
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Apart from I and O, all tetrominoes rotate such that the bottom of the tetromino is at the bottom of the piece's bounding box. S and Z rotate between two states so that the center column stays constant. O does not rotate; I rotates between two states as depicted in the illustration.
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The differences between this and many other rotation systems are that the flat-side-down states of J, L, and T are pushed down by one space, that S and Z round in different directions, that I rounds differently from the other pieces, and that I requires more space under it to rotate to a vertical orientation.
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It originally did not utilize [[wall kick]]s. [[Arika]] took inspiration of this rotation system, adding mild wall kicks and initial rotation to their own rotation system. This modified rotation system is called the [[Arika Rotation System]] (ARS). In addition to the TGM series, most arcade games developed in Japan before the guideline followed the Sega rotation rules with varying degrees of wall kicks, such as ''[[Flash Point]]'', ''[[Bloxeed]]'', ''Sega Tetris'', ''[[Tetris Plus]]'', and ''[[Tetris Plus 2]]''.
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'''Sega rotation''' is a [[rotation system]] that has been used by [[Sega Tetris|Sega's arcade version of ''Tetris'']] and its successors.


== Colors ==
== Colors ==
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|-
|-
|I: red
|I: red
|{{pfstart}}
|<playfield>
{{pfrow| | | |Z|Z|Z|Z| | | }}
...ZZZZ...
{{pfrow| | | | | | | | | | }}
..........
{{pfend}}
</playfield>
|-
|-
|J: blue
|J: blue
|{{pfstart}}
|<playfield>
{{pfrow| | | |J|J|J| | | | }}
...JJJ....
{{pfrow| | | | | |J| | | | }}
.....J....
{{pfend}}
</playfield>
|-
|-
|L: orange
|L: orange
|{{pfstart}}
|<playfield>
{{pfrow| | | |L|L|L| | | | }}
...LLL....
{{pfrow| | | |L| | | | | | }}
...L......
{{pfend}}
</playfield>
|-
|-
|O: yellow
|O: yellow
|{{pfstart}}
|<playfield>
{{pfrow| | | | |O|O| | | | }}
....OO....
{{pfrow| | | | |O|O| | | | }}
....OO....
{{pfend}}
</playfield>
|-
|-
|S: magenta
|S: magenta
|{{pfstart}}
|<playfield>
{{pfrow| | | | |T|T| | | | }}
....TT....
{{pfrow| | | |T|T| | | | | }}
...TT.....
{{pfend}}
</playfield>
|-
|-
|T: cyan
|T: cyan
|{{pfstart}}
|<playfield>
{{pfrow| | | |I|I|I| | | | }}
...III....
{{pfrow| | | | |I| | | | | }}
....I.....
{{pfend}}
</playfield>
|-
|-
|Z: green
|Z: green
|{{pfstart}}
|<playfield>
{{pfrow| | | |S|S| | | | | }}
...SS.....
{{pfrow| | | | |S|S| | | | }}
....SS....
{{pfend}}
</playfield>
|}
|}


== Basic rotation ==
== Games ==
[[Image:ARS-pieces.png|thumb|All rotation states of all seven tetrominoes. From top to bottom: I, J, L, S, T, Z. Top right: O.]]
The following games use Sega rotation as their basic rotation: <!-- add more detail later -->
 
*''[[Tetris (Sega)|Sega's arcade version of Tetris (1988)]]''
Tetrominoes start out centered, rounding to the left. I goes in columns 3&ndash;6 counting from the left, O in columns 4&ndash;5, and others in columns 4&ndash;6. Each tetromino starts with its topmost solid block in row 20 (or 22 in ''TGM ACE'').
*[[Tetris (Mega-Tech)|''Tetris'' (Mega-Tech)]]
Each tetromino is ordinarily spawned flat side up. However, if the player holds down a rotate button while the tetromino is being spawned, it is spawned rotated by one unit (Initial Rotation System).
*[[Tetris (Mega Drive)|''Tetris'' (Mega Drive)]]
 
*''[[Flash Point]]''
Apart from I and O, all tetrominoes rotate such that the bottom of the tetromino is at the bottom of the piece's bounding box. S and Z rotate between two states so that the center column stays constant. O does not rotate; I rotates between two states as depicted in the illustration.
*''[[Bloxeed]]''
 
*''[[Tetris Plus]]''
The differences between Sega rotation and [[Nintendo Rotation System]] are that the flat-side-down states of J, L, and T are pushed down by one space, that S and Z round in different directions, that I rounds differently from the other pieces, and that I requires more space under it to rotate to a vertical orientation.
*''[[Tetris S]]''
*''[[Tetris Plus 2]]''
*[[Tetris The Grand Master series]]
*''[[Tetris 64]]'' (with Rotation Center off)
*''[[Sega Tetris]]''


Sega rotation originally used no [[wall kick]]s. [[Arika]] took Sega rotation, added mild wall kicks, and ended up with [[TGM Rotation]], or Arika Rotation System. In addition to the TGM series, most arcade games developed in Japan before the guideline followed the Sega rotation rules with varying degrees of wall kicks, such as [[Flash Point]], [[Bloxeed]], [[Sega Tetris]], and the [[Tetris Plus]] series.
== See also ==
*[[Arika Rotation System]]


== References ==
== References ==
*[http://www13.plala.or.jp/TETRiS_TGM/kouza/index.htm TGM rotations, in Japanese]
*[http://www13.plala.or.jp/TETRiS_TGM/kouza/index.htm TGM rotations, in Japanese]


[[Category:Rotation Systems]]
{{Template:Sega games}}
[[Category:Rotation systems]]

Revision as of 10:28, 4 May 2020

All rotation states of all seven tetrominoes. From top to bottom: I, J, L, S, T, Z. Top right: O.

Sega Rotation is the rotation system used by Sega from Sega's 1988 Tetris arcade game until 1999, in Sega Tetris. Aside from Sega games, this rotation system was used as a basis for rotation in many other Japanese Tetris games.

Basic rotation

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. Each tetromino starts with its topmost solid block in row 20. Each tetromino is ordinarily spawned flat side up. There is no initial rotation and no wallkicks. Additionally, the ceiling prevents rotation.

Apart from I and O, all tetrominoes rotate such that the bottom of the tetromino is at the bottom of the piece's bounding box. S and Z rotate between two states so that the center column stays constant. O does not rotate; I rotates between two states as depicted in the illustration.

The differences between this and many other rotation systems are that the flat-side-down states of J, L, and T are pushed down by one space, that S and Z round in different directions, that I rounds differently from the other pieces, and that I requires more space under it to rotate to a vertical orientation.

It originally did not utilize wall kicks. Arika took inspiration of this rotation system, adding mild wall kicks and initial rotation to their own rotation system. This modified rotation system is called the Arika Rotation System (ARS). In addition to the TGM series, most arcade games developed in Japan before the guideline followed the Sega rotation rules with varying degrees of wall kicks, such as Flash Point, Bloxeed, Sega Tetris, Tetris Plus, and Tetris Plus 2.

Colors

Games using TGM/Sega rotation generally uses the following color scheme:

I: red
...ZZZZ...
..........
J: blue
...JJJ....
.....J....
L: orange
...LLL....
...L......
O: yellow
....OO....
....OO....
S: magenta
....TT....
...TT.....
T: cyan
...III....
....I.....
Z: green
...SS.....
....SS....

Games

The following games use Sega rotation as their basic rotation:

See also

References