Get Diablo 2 and LOD expansion. Most addictive RPG ever IMHO especially if you play it online. I still get addicted to it every once or so and just create a new character and spend like 50 hours on it. The game doesn't seem very addictive, but once you get hooked you can't stop playing it. I remember thinking as I was killing nightmare pindleskin that I'll stop after the next gold item. 5 gold items and 4 hours later, still farming him for items. Best character: lvl 89 hammerdin in act 4 hell. This is a purely SP character by the way with no cheap items or anything that is cheating.