GO Series: Undead Storm is, simply, a steal. Frantic, fast-paced four-player action, copious achievements and three levels of difficulty come together to make this an experience worth replaying many times. While those who would prefer to strategise their way out of a zombie apocalypse might feel a little bit left out by this game's rain-of-gunfire approach to problem solving, it's difficult not to get seduced by the simple, frenzied fun. Some minor gameplay niggles are present, but the experience is more than worth the price of admission.