Oh goodness.
Assassin's Creed Series, currently on the first one since I started way late on the series.
Team Fortress 2
Garry's Mod
Left 4 Dead 2, haven't played much though.
Portal 2 (Perpetual Testing Initiative, beat the actual game nearly a year ago.
Minecraft
Crashtastic, google it. So addicting.
several iOS games.
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