TETRIS GLOSSARY
IRS
Also called Initial Rotation System
A rotation applied as a piece enters, using an input prepared before spawn. It can matter at high gravity or near the ceiling. It is a rule of the game, not simply rotating quickly after spawn.
View in the A–Z glossary →- Between piecesHold a rotation input
- Next piece spawnsInitial rotation is applied
- Continue playingUse the rotated entry state
Only games with initial rotation support honor this buffered action.