It's two games in one - what can possibly go wrong? Simple: each game is only thirty minutes long, and there's very little replay value. There's a few features (training mode, timed mode and standard mode), but I found they add little to the overall experience. Don't get me wrong; blasting zombies is fun, especially with a friend, and the ham voice work from the arcade/PC version is kept intact here. I found it funny how these voice actors deliver their lines so badly. If you had fun with GHOST SQUAD, you'll have fun with this one, too. I just wanted some more levels and more features than this.