Games I played and liked (yes, I've never played a game I didn't like at least a little bit):
- D&D Basic/Expert/Companion/Master/Immortal boxed sets, then the handy D&D Rules Cyclopedia. - Started when I was 12, then moved on to the harder stuff.

- AD&D 2nd edition - Ran more campaigns than I remember. Loved it at first, got tired of it around 95 or so.
- D&D 3E - What can I say, I love it. Hoping for a 3.1 version soon though. The flaws of the system bug me like warts on a good looking girl.
- Star Frontiers, Alpha Dawn, then Knight Hawks. I loved the simplicity of having only four main races in a SF setting. Yazirians rule.
- Top Secret/SI - The only thing I didn't like about this game is that you anticipated being James Bond and usually got blown away by some lucky die roll from a lackey. But it was fun anyway, for some reason.
- Gamma World - Spent more time making up dozens of wacky characters than playing the game.
- Chill - I liked the campy flavor of it.
- Call of Cthulu, original. Fun to run.
- Paranoia - Any game with tactical nuclear grenades that have a range of 50m and an area effect of 2km is a good thing.
- Toon - I'll never forget the time I got into a "Yes!", "No!" arguement with another player for a full five minutes (while everyone else drank and laughed at us hysterically) then finally tricked him.
- Tunnels and Trolls - This thing was good munchkin fun. TTYF.
- Vampire - Ran this once. Good, dirty fun. The scenario was that everyone played themselves, and I turned them into vamps. They had to find and destroy me in downtown San Bernardino while dealing with their vampirism.
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Torg - The rules took me a full 6 months to figure out (and I had to read the 3 novels to figure out the campaign setting!), but what an outstanding game and campaign setting. I ran two very successful campaigns, and had more fun than I can remember. This game was ahead of its time (and probably too ambitious).
edit - how could I forget:
Marvel Super Heroes - This is an example of how rules can fully support a genre. Loved to play it.
Another Edit: Cut out the ones I bought and didn't play, forgot the subject of the thread.
There were probably others. (and of course there were, I've edited this thing a bunch..) My mother got rid of a lot of my stuff when I was young,

and I had to sell much more of it quite simply to survive.... (cue the violins...) I'm something of a completist, and have a compulsion to buy everything in a system, so we're talking about a lot of stuff. Luckily, I cured myself of this before the OGL and the d20 license....