Much more money for humans to survive (remember that you can buy at any time). Humans run faster, though not as much as zombies. Humans can jump although their gravity is much less than that of zombies. Humans start with grenades and a better weapon. The zombies apart from their alien sword, come out with three knives to be able to throw them. Automatic doors removed. Round time reduced to just 3 minutes to make it more fun.