Simple fun not too hard, a little too easy, but it's fun when you get swarmed by zombies and die. Or if you get swarmed and make it out. I actually think there should be more weak zombies, it's just cool to see a shit load of zombies coming at you and you're mowing them down. Also, leveling up is good and I like how you start over when you die. If you didn't everyone would have high level guns. The only real problem is I lag out a lot. At first when I was playing this never happened, but login back in is quick. But I think it's my connection. Good game, in my favorites.