Star Control, not the proper game but the Melee bit ruled, that was great fun shooting friends, also Descent ruled, we used to play mass multiplayer lan games of that in one of my old flats, 10Mb on coax...
Asherons call, nothing else comes close. so much better than anything else out there, pity it costs $10 a month, or i'd still be playing it, and school be damned!
[edit] $10 USD a month...
Ah can't believe nobody has mentioned the Sonic series on the ol mega drive!!! Best platformer ever. twas amazing, there wasn't any cheats for it and distinct levels. You got a sense of fun and achievement out of that that you just can't get in games these days. But GT3 rocks and I am getting San Andreas and GT4 when they come out, soon hopefully.