> single-player games
I get obsessive about some games. A completionist, one might say. And when I've achieved what I want to in the game, I suddenly wake up and realize I haven't been outside for a week and I've ignored my friends, family, and colleagues. Worst, the guilt of that realization can be so overwhelming that I am tempted to ignore it and simply start another game that takes over my consciousness.
I've observed similar behavior in some others. It was most obvious among World of Warcraft (WoW) players when I went to university. I knew more than a handful of WoW players who dropped out of school because they found their in-game social circle more important than just about everything else in their lives. Rather than studying or going out, they needed to be present for the next raid (WoW session).