The zombies are coming-- and they're not just going to line up and file in in an orderly fashion. Oh wait, that's exactly what they're going to do. Yet even in Normal mode this game is no cake walk.

Watch the scrolling bar in the lower righthand corner of the screen. It tells you which type of zombies the next few waves will contain and when they'll be arriving. Different types of zombies require different types of towers to defeat them, so you need to plan accordingly.

You earn money for every zombie that you kill, so as the waves get more difficult, you can buy more towers. If you save up your money, you can buy some really powerful, zombie-destroying machines. With over 60 levels and 4 difficulty modes, this game has a ton of zombie defense for you to enjoy.