IRS (Initial Rotation System) is a mechanic on TE:C that allows you to rotate a piece before it spawns on the board, if you have the rotation button held down before the piece spawns.
this can be useful to save yourself from danger, or just to get higher zone lines count (this is how anything higher than 21-lines zone can be done)

sometimes funny rotations can happen like these. pretty sure this is my second video about it lol

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