Although before buying this i heard it was terrible to play single player, i have not seen any truth to this. It is much harder to play single player simply because there are just as many enemies as when you play it co-op. And don't get me wrong, it's fun to play single player mode but 100 times more fun to play with a friend. So don't be afraid, and definitely check this out.Oh, and the zapper helps SO much more in shooting.