Players combine dice to target and remove zombies from an ever-advancing horde before their barricade is overrun. The game is suitable for all ages and abilities, and can be played in as little as 15 minutes (in the shorter version). The key game mechanics involve manipulating the numbers rolled on the dice via combinations of mathematical functions (from basic addition and subtraction through to squaring and cube rooting) to hit the exact numbers on the encroaching zombie cards - you need a precise head shot to take them out! As a co-op game, the difficulty can be tailored to suit the skills of the players, and supports groups of mixed abilities well.