No one knows where they come from, but these zombies are really becoming big problem since they are multiplying fast. The only way to kill them is to destroy their brains and that won't be easy. Furthermore, they are dangerous since they would eat anybody that gets too close to them. You need to be a sharpshooter to blow their brains out. It would take lots of practice to be a sharpshooter and that won't be easy since we need lots of ammo for it. The problem is that ammo are hard to find these days, especially since other people have used most of it.
The land looks no hope, but if we are able to hold on to our lives, there might be hope for us waiting. All we need right now is a wall that would keep them out and a vehicle that we could use on the road, so we are not easily get eaten by these zombies. Moreover, they can't reach us if we are going to use a monster truck since it is very massive. Besides, these trucks can easily crush them and we don't even need to use a gun to put them out of their miseries.
The idea in this game is to get to the finish line as fast as you can. Crash any zombies or anything on your path that can be thrash. You would get some points out of doing that. You don't get some kind of money to upgrade the truck, but the truck don't need some kind of upgrade for you to finish the game. Remember that you can go back to where you come from since you can reverse your truck's way. The game gets harder and more difficult as you make some progress.