This game might have the title of zombie or undead in it, but sadly you aren’t going to see any walking undead here. Sorry to disappoint you, but this game is more about racing. The title of the game must have been because the setting of the story is that the truck owner is trying to run from zombie outbreak and he must make it to a safe place as quickly as possible.
You need to drive as fast as you can make sure you go to your destination safely. You must drive your truck as fast as it can go, but you need to take some necessary precautions since you are going to die once the truck crashes. But on the other hand, you need to drive fast so the zombies won’t catch up to you.