It is straight-up classic arcade, 2D scrolling through dungeons, killing monsters. That's the dungeon aspect of the game. There is also a player-versus-player aspect of the game in which players enter the Arena to face each other. This is evocative of a whole other kind of classic arcade game. So Dungeon Fighter Online is kind of like an amalgam of everything we loved about arcade games but brought online so that it can benefit from everything an MMO offers.