Tetris is a game in which various falling blocks are to be organized and arranged to form rows with no spaces. It is one of the most well-known video games ever made and has been the center of much legal dispute in the late 80's and early 90's.

Tetris is a very popular falling blocks puzzle game, released on a large spectrum of platforms. Alexey Pajitnov originally designed and programmed the game in June of 1985, while working for the Dorodnicyn Computing Centre of the Academy of Science of the USSR in Moscow. Pajitnov has cited pentominoes as a source of inspiration for the game.

Tengen released a version of Tetris for the Nintendo Entertainment System that was recalled due to legal complications, related to an official release of Tetris on the same console. This edition is viewed by some as the superior, offering competitive and cooperative two-player modes. Copies of the cart are rare.

A euphemism for masturbation. "I won at tetris, just now. No playing, just winning."