Use 13 different cars to run over the endless horde of zombies in a fully physics-based environment! Get more gas by killing zombies to keep your car running, then collect gold and use it to buy new cars so you can kill more zombies!
Estimates — owners use the Boxleiter method (reviews × 32), wishlists proxy followers × 12, revenue uses ~62% of list price × est. owners. These are rough industry heuristics, not official data.