30. Descent 3 (2000)
Unlike many (any, really) of the games you'll find on this list, Descent 3 is a first-person shooter that put you in the cockpit of a spaceship exploring deep space mines. Developers at Interplay impressed many with their lighting techniques and improved graphics, and put serious effort into remedying the anemic storytelling of earlier Descent games. Moreover, the game was mod-friendly enough to give the fan community level creation powers. Dong-shaped mining colonies for all!