[awildermode]

also, 25 Anniversary of Tetris

from wikipedia

Tetris (Russian: Тетрис) is a puzzle video game originally designed and programmed by Alexey Pajitnov. It was created on June 6, 1984,[1] while he was working for the Dorodnicyn Computing Centre of the Academy of Science of the USSR in Moscow.[2] He derived its name from the Greek numerical prefix "tetra-"—as all of the game's pieces (known as Tetrominoes) contain four segments—and tennis, Pajitnov's favorite sport.

Edit: I find it awkward that Google has Tetris on their main page and not D-Day.