9. Q*bert
Is it possible to become obsessed with an orange creature with a big nose? Spend five minutes playing Q*bert and you'll find out.
The object of the game, which takes place solely on a pyramid designed to look 3-D, is to have Q*bert jump on every square to make it change colour. Beware of your enemies though: Coily the snake, Uggs, Wrong-Ways, Slick and Sam and the deadly red balls!