What games have you been "hooked" on?

Diablo 2 for a too long time .

Also I've probably finished Deus Ex 10+ times already, so yea that too.

Last one I've been playing for the last year now is soldier of fortune 2 multiplayer demo... That's right, I've been playing a demo for a year now, it only has 1 official map and 4 gamemodes, but still it's awesome . There are about 80 servers active. I have 3 favorite servers where I play regurlaly and where I know almost everyone there.