Back in April, I reviewed the Zombie Outbreak Simulator, which is a fun app that lets you prepare for the zombie apocalypse by combining a simulated zombie virus outbreak with Google Maps.

With the Zombie Outbreak Simulator, you can set the parameters for your very own zombie invasion, choosing the number of civilians, their preparedness, the number of zombies, zombie speed, and more, and then watch the carnage play out.

One of my complaints when I first played Zombie Outbreak Simulator was the lack of maps (players were limited to just one) but the game was recently updated to add 10 new maps from across the globe. Now you can set up scenarios in the U.S., U.K., Australia, Europe, and Brazil.

The new maps come in a variety of sizes, so you can set up an outbreak and run through a quicker simulation in the locale of your choice.

To celebrate, the developers of Zombie Outbreak Simulator have provided five promo codes to give away to you lovely readers. To enter to win, retweet this article before 4 p.m. PDT on Friday, May 11, and make sure you’re following AppAdvice so we can contact you if you win.

For another chance to win, or if you don’t use Twitter, you can leave a comment on this post to be automatically entered into the contest. If you tweet and comment, you have two chances to win (there’s a maximum of two entries per person). Good luck!