Tetris is a long-running falling-block puzzle game in which players arrange tetrominoes to clear lines, and the T-spin is an advanced technique where the T piece is rotated into a gap it could not simply drop into. A T-Spin Double clears two lines at once, making it a prized move in competitive play and in games such as Tetrio. Clips of the move spread through gameplay videos, streams and highlight reels, where the sound marks the moment of success. It remains popular because it instantly tells other players that the clear required planning, not a lucky piece.