I always get obsessed with doing all the quests and sidequests in large RPGs, up to the point of sometimes pausing them for months (Gothic 2 and now, again, Morrowind) or even years (Morrowind before reinstalling it on my current PC) for having played them too much. Alas I also tend to get obsessed with some crappy but designed to be addictive casual games, I forced myself to stop playing that crappy FarmVille on PC, but I'm still playing too much Zenonia 5 and GT Racing 2 on my tablet.