What are your favourite computer games/board games and why?

Ultima: I’ve got almost of all the Ultimas in pristine condition (original boxes, complete with cloth maps and trinkets) in a prominent position on my game shelf. That series was my introduction to the RPG genre. The storylines were fantastic and the series seemed to get better and better with every sequel. Until Ultima 8 (bleh) and Ultima 9 (double bleh) came out, anyway.

Other games on my shelf include Starflight, Darklands, System Shock 2, Thief, Homeworld, Planescape: Torment, Jagged Alliance 2, Deus Ex, The Longest Journey, Crusader: No Remorse, Crusader: No Regret, Knights of the Old Republic, and of course, Fallout 1 and 2. Each of those had features and game play that just hooked me for many hours.