AppAdvice has teamed up with Banzai Labs in order to offer you a chance to win one of 15 promo codes for Zombie Squad ($.99) for iPhone, iPod touch, and iPad.

In Zombie Squad, you’re required to lead a group of elite soldiers into battle against zombie hordes in order to rescue the few survivors of the zombie apocalypse. But don’t let the doodle graphics fool you, this is as much of a strategy game as it is an arcade game thanks to the amount of control you have over your soldiers and civilians.

Boom goes the zombie

Zombies begin their attack the moment your soldiers’ feet hit the ground, so you must be ready to put them into action. You’re able to move your soldiers around the screen by drawing lines from them to wherever you would like them to go. They will automatically fire upon zombies that are within range, but you can also tap and hold your finger on a zombie to manually direct the fire of your entire group.

Your soldiers do have a limited amount of health and ammo, but they can be recharged with vehicles or outposts. If a machine gun, shotgun, or mini gun does run out of ammo, your soldiers are smart enough to use one of their close combat fallback weapons. Soldiers that are fixed to outposts or vehicles have an unlimited supply of ammo, however.

During combat you’ll want to keep an eye out for civilians because getting them safely to a vehicle or outpost will earn you bonus points. If a civilian does succumb to a zombie attack, however, they’ll turn into one of those ghastly beasts themselves. Civilians can be directed using the same line-drawing mechanic.

Zombie Squad includes four increasingly difficult maps, full stat tracking, and Game Center leaderboards.

To have a chance at winning one of five Zombie Squad promo codes, simply hit that blue tweet button near the bottom of this page or retweet this post from your favorite Twitter app before 11:59 PM PDT tonight (September 20th). We will then search the Twitterverse for all of the retweets and randomly choose our lucky winners. The winners will be notified via Twitter, so please be sure to follow us so we can send you your promo code via a direct message.

Non-Twitter users and those of you who want to increase your odds of winning can simply leave a relevant comment below before 11:59 PM PDT tonight to have a chance at winning one of the other 10 promo codes.

Feel free to participate in the giveaway via either or both methods. Only one entry per person per method is allowed, totaling up to two entries per person if using both.