This week, Tetris turns 30. The game that has sold more than 170 million copies. The game has nostalgic UK button-bashers forking out a reported £6,800 a month on eBay. The game that has led to your increasing satisfaction when you see blogs like these.
They've bruised our thumbs, bollocksed up our eyesight and stolen our childhoods - and we love them for it. Of these 20 video games that changed the world, how many of them have you played?