This game is a blast with friends. Be warned about single player: This game is much harder to play unless you have a friend to play it with. It has countless hours of fun between the included maps, survival, loot collecting and piles of DLC. Think tower defense with user interaction. If you buy Dungeon Defenders, you should pick up a 2nd copy and gift it to a friend so you can both enjoy the game together and make the experience that much more.
