Maple Story

You can explore a totally new and unknown world you have never been to, put on beautiful clothes and gorgeous accessories, and even attract other users in the process. You may begin the journey to explore the world of unknown alone, but you may come out on the other end with numerous new friends through hunting and chatting. If you're tired of hunting and competition, how about playing minigames with a friend for a change?
Official Site: http://www.maplestory.com/ or http://www.mapleglobal.com/