Civilization V (75 hrs) - What can I say about this game that I haven’t said already?  This is the series that made “One More More Turn…” famous and it still works today.  If I were to start a game tonight, I would not go to bed at a reasonable time.

Team Fortress 2 (70 hrs 45 min) - This game is almost as addictive as Civ 5.  I never thought I’d end up saying that about a first person shooter.  But I’ve played nearly all of my 85 hrs logged for this game in 2011 and in 2012 it might even surpass Civ 5!