I've been trying to study what makes a game addicting/fun. And now, of course, when I say "addicting" I mean fun, not the "I need one more hit of crack" kind of addicting.
What makes it so that someone can play a game, and look at their play time, and go "Holy crap, 100 hours? That can't be right..," without having left the game idling.
So far from what I've collected surveying people, the most common features in a game seem to be:
- Getting every item
- Customization in the creation or development (leveling) of one's character