Me and my buddy finished the game playing Co-op. Got the "Friends with Benefits" achievement.
Holy hell, I couldn't see trying this game in solo mode.
The trek through the rock worm innards was one of the best parts.
Btw, we finally made it through the 10th level on Horde mode, got the cheevo, and then quit. It was too hard on the easiest setting.
I sent it back to Gamefly the next day.
