Nexon has released a version of its extremely popular (in Asia, at least) Dungeon Fighter Online game on the iPhone, called Dungeon Fighter Gunner. You can download the title right now -- it's pretty standard fare, featuring lots of onscreen touch controls, and the same 2D beat-em-up style gameplay that makes the online title so popular overseas.
But what's most important about this app isn't necessarily what it is, but what it represents. Dungeon Fighter Online is a huge franchise, boasting over 300 million registered users around the world. That's gigantic -- by comparison, World of Warcraft (definitely the largest MMORPG in the West) hosted about 12 million users at its peak. DFO is by far Nexon's biggest title, and while it has put a few apps onto the store already, this is the first app it's released that's been related to the DFO juggernaut.
So we'll have to see how this one does. There are some huge brands out there in terms of online gaming, both in the East and West, that could benefit a lot from some tie-in titles on the App Store. If this game does well, or gains just a fraction of the audience it already has on the PC, we could be looking at the first in a series of big tie-in hits.