Nexon's 2D, side-scrolling, action-RPG Dungeon Fighter Online has been dated and will launch in North America on June 9th, 2010. The free-to-play game is developed by Nexon's Neople studio and will allow players to fight alone or with a party of up to three players in dungeons or go head-to-head with other players in PvP. Check out the full press release for more details.