Assassin's Creed II
Back to the Future: The Game episodes
BIT.TRIP.RUNNER
Morrowind
Oblivion
Grand Theft Auto IV
Half-Life
Half-Life 2: Episode 1
Half-Life 2: Lost Coast
NBA 2k11
NBA 2k12
Star Wars: KotOR
Splinter Cell: Chaos Theory
Universe Sandbox
You Don't Know Jack
Though, to be fair, I just axed a lot of former friends on my list since I don't play L4D2 much any more.
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Will not remove this line of my signature until the Seahawks, Jazz or Rockies win a title (Started 5-16-09)
http://www.sporcle.com/games/Kazbar/gfaqscontest