Most games with zombies are horror apocalypse; in this one, you are, by implication, a mad scientist unleashing the zombie apocalypse on the world. It's played in a series of stages, each one set in a "city"; you trigger a zombie infection, then watch as your zombies eat the brains of citizens, sweeping your pointer about to collect coins when they die. Then, you upgrade your zombie capabilities in the "Lab." At higher levels, the humans fight back with mercs, secret agents, Spiderman, Santa Claus and other such things who are harder to infect and who fight your zombies, possibly stopping the infection before you collect lots of coins. Luckily, you get bombs and such to blow them up as an upgrade.