Tetris (1986)

This puzzle, a remake of an old Russian game called Pentaminos, by the game designer Alexey Pazhitnov, is possibly the most ''cloned'' Shareware arcade game in history, this addictive arcade game from Russia first appeared on Shareware BBSs in 1986 for the IBM PC. Clones and enhanced versions have been released for virtually every platform and are still being made today.