View source for I-Spins in SRS

Different [[rotation system]]s that approximate [[SRS]] apply different [[wall kick]]s and [[floor kick]]s when the player [[twist]]s the I [[tetromino]].

== Guideline SRS ==
Games such as [[Tetris Worlds]] and [[Tetris DS]] are based on the [[Tetris Guideline]], including SRS. They have the following behavior:
{| 
|valign="top"|<playfield>
..........
...IIII...
..........
..........
..........
..........
...G..SS..
...G.SSJJJ
...G.....J
</playfield>
|
<playfield>
....I.....
....I.....
....I.....
....I.....
..........
..........
...G..SS..
...G.SSJJJ
...G.....J
</playfield>
Rotated left
|
<playfield>
..........
..........
..........
..........
..........
....I.....
...GI.SS..
...GISSJJJ
...GI....J
</playfield>
Soft dropped
|
<playfield>
..........
..........
..........
..........
..........
..........
...G..SS..
...G.SSJJJ
...GIIII.J
</playfield>
Rotated right
|}

But the wall kicks are not symmetric, as the kick up is performed in preference to the kick down when rotating left:
{|
|valign="top"|<playfield>
..........
...IIII...
..........
..........
..........
..........
..ZZ..T...
LLLZZ.TT..
L.....T...
</playfield>
|<playfield>
.....I....
.....I....
.....I....
.....I....
..........
..........
..ZZ..T...
LLLZZ.TT..
L.....T...
</playfield>
Rotated right
|<playfield>
..........
..........
..........
..........
..........
.....I....
..ZZ.IT...
LLLZZITT..
L....IT...
</playfield>
Soft dropped
|<playfield>
..........
..........
..........
..........
..........
.....IIII.
..ZZ..T...
LLLZZ.TT..
L.....T...
</playfield>
Rotated left
|}

However, an extra block impedes the choice of the upward kick position:
{|
|valign="top"|<playfield>
..........
...IIII...
..........
..........
..........
........G.
..ZZ..G...
LLLZZ.G...
L.....G...
</playfield>
|<playfield>
.....I....
.....I....
.....I....
.....I....
..........
........G.
..ZZ..G...
LLLZZ.G...
L.....G...
</playfield>
Rotated right
|<playfield>
..........
..........
..........
..........
..........
.....I..G.
..ZZ.IG...
LLLZZIG...
L....IG...
</playfield>
Soft dropped
|<playfield>
..........
..........
..........
..........
..........
........G.
..ZZ..G...
LLLZZ.G...
L.IIIIG...
</playfield>
Rotated left
|}

The following can be performed instead:
{|
|valign="top"|<playfield>
..........
...IIII...
..........
..........
..........
..........
..ZZ..T...
LLLZZ.TT..
L.....T...
</playfield>
|<playfield>
....I.....
....I.....
....I.....
....I.....
..........
..........
..ZZ..T...
LLLZZ.TT..
L.....T...
</playfield>
Rotated left
|<playfield>
.....I....
.....I....
.....I....
.....I....
..........
..........
..ZZ..T...
LLLZZ.TT..
L.....T...
</playfield>
Moved right
|<playfield>
..........
..........
..........
..........
..........
.....I....
..ZZ.IT...
LLLZZITT..
L....IT...
</playfield>
Soft dropped
|<playfield>
..........
..........
..........
..........
..........
..........
..ZZ..T...
LLLZZ.TT..
L.IIIIT...
</playfield>
Rotated left
|}

== Tetris Advance ==
[[Minna no Soft Series: Tetris Advance]], while implementing [[SRS]], included several bugs including the lack of some wall kicks.

{|
|valign="top"|<playfield>
..........
...IIII...
..........
..........
..........
..........
...G..SS..
...G.SSJJJ
...G.....J
</playfield>
|
<playfield>
....I.....
....I.....
....I.....
....I.....
..........
..........
...G..SS..
...G.SSJJJ
...G.....J
</playfield>
Rotated left
|
<playfield>
..........
..........
..........
..........
..........
....I.....
...GI.SS..
...GISSJJJ
...GI....J
</playfield>
Soft dropped
|
<playfield>
..........
..........
..........
..........
..........
....I.....
...GI.SS..
...GISSJJJ
...GI....J
</playfield>
Can't rotate right
|}

==Lockjaw==
In [[Lockjaw]], both left and right prefer to kick down rather than up when rotating:
{|
|valign="top"|<playfield>
..........
...IIII...
..........
..........
..........
..........
..ZZ..T...
LLLZZ.TT..
L.....T...
</playfield>
|<playfield>
.....I....
.....I....
.....I....
.....I....
..........
..........
..ZZ..T...
LLLZZ.TT..
L.....T...
</playfield>
Rotated right
|<playfield>
..........
..........
..........
..........
..........
.....I....
..ZZ.IT...
LLLZZITT..
L....IT...
</playfield>
Soft dropped
|<playfield>
..........
..........
..........
..........
..........
..........
..ZZ..T...
LLLZZ.TT..
L.IIIIT...
</playfield>
Rotated left
|}

[[Category:Gameplay]]