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Team Fortress Classic - Still play this on a daily basis, easily the most time I have spent in any game. A few thousand pretty easily.
Minecraft - The possibilities!! Also spent hundreds of hours on it, maybe a thousand.
Deus Ex - Still what I consider to be the greatest game of all time. Just perfect in every way. I've beaten it several times already (I can count the number of games I've beaten more than once on one hand) and I see myself beating it several times more in the future.