Zeno Clash II - gamefront.com

The first-person fighter followup features a new, open world, brimming with “most of the characters, enemies, and items from the first game–all of which return with dramatic visual enhancement” as well as a host of new characters and items. RPG elements are in, and the fighting system has been updated to allow more precise strikes. And, even more dramatically, drop-in, drop-out co-op is in.