June 6th is the 25-year anniversary of the game. Happy Birthday Tetris!
Tetris (Russian: Те́трис) is a puzzle video game originally designed and programmed by Alexey Pajitnov. It was created on June 6, 1984, while he was 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- (all of the game’s pieces, known as Tetrominoes, contain four segments) and tennis, Pajitnov’s favorite sport.