You are a hunter, trapped in an ancient abandoned fortress and surrounded by Pterodactyls, Trachodons, and other prehistoric creatures. Your large gun is your only friend. Shoot as many of the prehistoric creatures as you can to gather points. You must, at the same time, defend yourself against the snake that enters and exits your safe haven. Although you cannot kill the snake, you can shorten it by shooting at it. How long can you survive before the snake touches you?