Back in the day, I used to play a LOT of Ultima (monochrome monitor, typed-in commands, growing fear of deadly nightshade). However, before that, we got an Atari system for Christmas one year, and it came with Ms. Pac Man. We played that for HOURS. The next day, we couldn't move our hands and our fingers were cramped into a semi-permanent claw-like configuration. Then there was KABOOM! http://en.wikipedia.org/wiki/Kaboom!_%28video_game%29 .

Lately, not too many. Pretty much Mahjong when I feel the need to meditate. However... I've started dabbling with Portal. It's pretty sweet. http://en.wikipedia.org/wiki/Portal_%28video_game%29