What game do you personally have the most hours played in?

I'm curious what game you guys have sunk the most hours into. Mine has to be RuneScape, I don't know the total hours because I've had so many accounts over the years I don't even remember half my passwords, but it's definitely in the thousands of hours now. I've played on/off RS2, OSRS, and RS3 since 2004.

I've also probably sunk anywhere from hundreds to 1000+ hours into Skyrim and Arcanum: Of Steamworks & Magick Obscura, though I don't know the counts there either since neither were through Steam. Embarrassingly enough I've never completed either of those two games - I get sidetracked making so many alt characters.

What about you guys? & What got you hooked on said game?