All is quiet until a government experiment goes into chaos. The experimental monkey becomes a zombie and everybody that he eats turns into a zombie. Needless to say, the zombies number increases in each one they kill. Now, they are going to your town and you need to stop them from reaching your town. So, you drove your monster truck and run over every zombie that you see on the road.
Run every monster that you see on the road. The zombie must not reach your town. There are money lying on the road and you can use it for upgrading your truck later on the game. Remember to conserve your energy so you can reach your destination safely.