Kwonho: The Fist of Heroes

Kwonho: The Fist of Heroes is a free online 3D fighting game produced and developed by NHN. The game, hosted on Ijji, puts players in control of customizable fighters that they can use to face off against other players and take on various other challenges.

Over time, players gain experience which sets them in a ladder ranking and rewards them with skill points that they can use to upgrade their most favored techniques.

Credit is also a reward for meeting certain challenges and it can be used to purchase additional skills and items to modify characters.

Since it is run by Ijji, the ability to use "G Coins" to purchase in game items with real money exists.