Your aim is to defend Matt and Draconica's Surfshack from attacking zombies, and kill as many zombies as you can in the given time. There is barrier next to the Shack to keep zombies away. Though it does dissapear if it is pushed by zombies too much. The main character you control is Matt, who is at the front. But BE SURE to go through the Tutorial in the game to learn about the different characters and their strengths. Have fun!