Here’s 15 things you need to know about the fighter, including what the heck “DNF” even stands for.ĭNF Duel is based on Nexon’s popular online action RPG beat ’em up Dungeon Fighter Online or DFO. Releasing on June 28 th for PS4, PS5 and PC, it’s developed by Neople, Eighting and Arc System Works of Guilty Gear and BlazBlue fame. If you’re looking for some fast-paced, 2.5D fighting game action with cool-looking characters, then Nexon’s DNF Duel may be worth checking out.