Arika Rotation System

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

TGM rotation is a game play mechanic used in Tetris The Grand Master and other Arika tetromino games, derived from Sega rotation.

Games using TGM/Sega rotation generally use Sega colors as well, and they start out with the topmost block on the top row (generally row 20).

Tetris the Grand Master Ace)

Wall kick

Illustration goes here.

Sometimes a rotation is blocked by the walls outside the playfield or by blocks inside the playfield. Most often, TGM tries to rotate the tetromino within the box without moving it, then try one space to the right, then try one space to the left, then fail. In some special cases, TGM skips one of these displacements. TGM2 and Sakura Tetris use the same system as TGM.

TGM3 also tries floor kick when rotating a T or I tetromino to some orientations.

References

• colour_thief's explanation of ARS wall kick on the tetrisconcept.com forum
• TGM rotations, in Japanese