Deus Ex probably. I don't have the exact number but I must have finished it at least sixteen times.
Nowadays... nothing lately. Infant daughter, lots of work, busy busy. Few months ago? Desktop Dungeons and Puzzle Quest.
Only one game stands out in my life as a true obsession. I loved, loved, loved http://gunbound.softnyx.net/
Played so many hours of it I could never count. Considering going back.
I really recommend it as F2P team-bases Worms/artillery play-alike with RPG-type stats and a variety of vehicles with distinct primary and special attacks. So much fun once you learn nuances of the different machines.
League of Legends, mostly because there isn't anything else to play at the moment.
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