This is the game that spawned a whole series of great zombie shooters. The Last Stand is simple yet effective. You have to see how long you can last surrounded by a wall as the zombie apocalypse rains down upon you. Try to shoot the faster zombies first or the ones closest to your wall because if that wall ever gets torn down then you're toast! Don't worry though. You'll be one of the mindless zombies soon enough and sometimes ignorance really is bliss!