Zombie TD pits you against wave after wave of zombies. Build, maintain and upgrade towers to hold off the zombie hordes over the course of 4 grueling days. The game is set in city streets and the player must construct towers to fend off wave after wave of zombie. Each tower can be equipped with a variety of weapons. The further the player makes it in the game, the better the weapons (anything from arrows to grenade launchers). Just as the weapons get better, so do the zombies. The difficulty level grows as the game goes on and so must the players ability to work with the tools and weapons given to him or her.