Different rotation systems that approximate SRS apply different wall kicks and floor kicks when the player twists the I tetromino.
Official SRS[]
Tetris Worlds, Tetris DS and Tetris The Grand Master Ace are based on the Tetris Guideline, including SRS. They have the following behavior:
|
Rotated left |
Soft dropped |
Rotated right |
Doing it the other way would make it kick up:
|
Rotated right |
Soft dropped |
Rotated right |
But the wall kicks are not symmetric, as Tetris Worlds, Tetris Deluxe, Tetris DS and Tetris The Grand Master Ace prefer to kick up rather than down when rotating left...
|
Rotated right |
Soft dropped |
Rotated left |
...unless there is an extra block to force a kick down.
|
Rotated right |
Soft dropped |
Rotated left |
The following can be performed instead. This is a well-known cheat in Tetris DS.
|
Rotated left |
Moved right |
Soft dropped |
Rotated left |
Tetris Advance[]
Minna no Soft Series: Tetris Advance, while implementing SRS, included several bugs including the lack of some wall kicks.
|
Rotated left |
Soft dropped, can't rotate right |
Lockjaw[]
In Lockjaw, both left and right prefer to kick down rather than up when rotating:
|
Rotated right |
Soft dropped |
Rotated left |
However, Lockjaw has an extremely glitchy kick from the second to the first or third orientation, making it unusable.
Theoretical SRS variations[]
The inconsistencies in SRS I rotation are caused by whether the 2 side kick goes before or after the 1 side kick, and whether the {±2,±1,} kick comes before or after the {±1,±2,} kick. Turns out, there are:
- 65536 such variations with no restrictions
- 256 symmetric variations (official SRS is not symmetric)
- 256 reversible variations
- 24 variations expressible as an offset table (official SRS is an offset table)
- 16 symmetric reversible variations
- 4 symmetric offset table variations
Offset table variations[]
The 24 offset table variations are a combination of the six side kick variations and four endpoint kick variations:
Side kick variations:
prioritize 1-kicks (used in tetrisimplementation) prioritize 2-kicks prioritize preserving left endpoint laterally (used in official SRS) prioritize preserving right endpoint laterally prioritize preserving left bounding edge prioritize preserving right bounding edge
Endpoint kick variations:
prioritize 1,2,-kicks prioritize 2,1,-kicks (used in tetrisimplementation) prioritize preserving left endpoint (used in official SRS) prioritize preserving right endpoint
tetrisimplementation uses a symmetric offset table system that does the 1 side kicks before 2 side kicks, and {±2,±1,} kicks before {±1,±2,} kicks. Therefore, B and D kick down, but A and C kick up.
Tetris Best/Tetris Return[]
Similar to SRS, the rotation systems used in Tetris Best (TBRS) and Tetris Return (TRRS) also allow this I-spin. Both left and right prefer to kick down, so the problem is solved.
Also, it is possible to do an I-spin tetris. It works from both directions.
old Tetris Best:
Soft dropped |
Rotated right |
new Tetris Best:
Soft dropped |
Rotated left |
