<p>Tetris is a tile-matching puzzle video game originally designed and programmed by Soviet Russian software engineer Alexey Pajitnov. The first playable version was completed on June 6, 1984, while he was working for the Dorodnitsyn Computing Centre of the Academy of Science of the Soviet Union in Moscow. He derived its name from combining the Greek numerical prefix tetra- (the falling pieces contain 4 segments) and tennis, Pajitnov’s favorite sport. The name is also used in-game to refer to the play where four lines are cleared at once.</p>
