Released in 2009, it was developed by Ska Studios and was designed entirely by company founder James Silva, previously best known for the Xbox Live Arcade game The Dishwasher: Dead Samurai.

[5][6] The game was developed using Microsoft XNA, though its tongue-in-cheek description claims it was made using "Hypermagic Engine 3.0 and the Megacore X parallelization processor."

The game's title makes excessive comic usage of features of Internet writing, such as leetspeak, overuse of exclamation marks, and typographical errors.

Using two analog sticks, the players shoot droves of attacking zombies while collecting power-ups, with the objective of surviving until the game's background song ends.

[5][13] Zombies went on to sell 200,000 copies by March 2010 and jumped to 308,000 in sales by August 2010[14] making Silva roughly $215,000 after Microsoft's 30 percent revenue fee.