Tetris (Russian: Тетрис) is a falling-blocks puzzle video game, released on a vast spectrum of platforms. Alexey Pajitnov originally designed and programmed the game in June 1985,[1][2] while working for the Dorodnicyn Computing Centre of the Academy of Science of the USSR in Moscow. He derived its name from the Greek numerical prefix "tetra-", as all of the pieces contain four segments, and tennis, Pajitnov's favorite sport.