Music and background noise is nice as well. The controls are a serious pain to get used to. You use the left analog stick for forward, backward, left and right strafe, and the right analog for up and down and turning. Players use the shoulder buttons on top to shoot and crouch, and reloading and switching weapons are handled on the main pad. At first, I really disliked this system, but after a little tweaking and a sharp learning curve, I think it works well.
Game play is fairly addictive.
You can tweak their AI and play on several different levels. More characters are opened up through story mode. All in all, I think I'm glad I got this game. There's absolutely no story to it at all, but the fun factor of this game is pretty high. Besides, they even have a challenge of destroying 50 zombies in less than 2 minutes by blowing their heads off.