Tetris

Tetris, a puzzle game, was invented by Alexey Pazhitnov in 1985, while he was working for the Academy of Sciences in Moscow, Rissia. Tetris is derived from the Greek word 'tetra' meaning four, as all the blocks available in the game are made up of four segments. Tetris is the best selling game ever, due to its availability on almost every device: computer and handheld.