Zombies have overtaken the city, but that was a long time ago since the situation is under control now. The city has since become a tourist attraction where the rich could hunt zombies. Of course, they would be in their truck and they would keep on shooting. The ammo would be unlimited since that is part of the fee that you are paying the admin of the safari. This is one of the best attraction nowadays since it could give you the scare of your life as zombies would come rushing to you to eat you. Of course, the danger is still there as some people do get eaten because they are overwhelmed by the zombies. If you manage to escape the safari alive then you have a bragging rights. The idea in this game is escape the city as hordes of zombies are coming after you. You don't need to kill all of the zombies as you only need to last till your truck reach the stop. Each kill would earn you money and you can use the money to upgrade or buy weapons. Beware though, as the weapon won't be permanent, so you need to carefully choose when you want to use it.