you pick one of 3 set characters and play through levels in the style of an action rpg (asd+1-0 to attack, arrow keys to move). before and after every level there is a "cut scene" which progresses a storyline.
it is mostly co-op (unless no one else is on the same level/stage as you), and you gradualy get new skill points, drops, upgrades etc.
![[image loading]](http://img173.imageshack.us/img173/82/07120812046mb.jpg)
the graphics are sub-par and the game and character development are completely linear. there is no world to explore casually as you would an mmo.
but the game is fun because you are going from A to B within each level (and not just grinding one location) and because every 20 minutes you see the story progress, rpg style.