MMOs are probably the most addicting games. Your not only playing with/against NPCs all the time but actual people with real intelligence(usually lol). There is always multiple people wanting to do the same thing as you and challenging you. In graal's case it is mobile, and can be played anytime anywhere (provided you have wifi or 3G). For me personally, i made great connections with some people and enjoyed taking towers with them. Thats why Im attached to this game, and always will be <3