Google UK have a special logo (Google Doodle) today to celebrate 25 years of Tetris. Originally designed and programmed by Alexey Pajitnov, it became one of the most popular and addictive games of all time. Pajitnov was originally a computer engineer for the Soviet Union and as such made very little money from the game because of Communism. The game was based on a board game.
Pajitnov eventually moved to the USA where he worked for Microsoft before joining Wildsnake Software in 2005 and creating puzzle games for the Xbox 360.