What is the object of "Boxhead 2"?

The object of "Boxhead 2" is to stay alive. This Flash-based computer game challenges players to fight off a wave of zombies using only a pistol and an unlimited amount of ammunition. Players can earn more guns, supplies and other items as they become more proficient.

"Boxhead 2" is part of a series of games that originated in 2006. Other titles in the series include "Boxhead (A Halloween Special)," "Boxhead: The Rooms" and "Boxhead: The Zombie Wars." In 2011, a new release, "Boxhead: The Nightmare," became available on social networks such as Facebook, allowing for interactive play. All the games have the same basic objective but offer different playing environments.