Tetris is so addictive, I still play it all the time on my Game Boy Colour. Always such fun to play. Same with Dr. Mario. I love those kinds of games.

But my favourite of all time is Kula World. It was on PS1, where you play as a beach ball grabbing keys, fruit and all sorts of other things while avoiding spikes, drugs and falling off the grid. Such a wierd game, but I used to play it all the time. Then I lost the disc and was gutted. Now I have it from PSN, I play it in between playing PS3 games. A seriously great game to play.