CyberPigeon's latest mission, "Zombie Apocalypse" is all about survival. As CyberPigeon enters their territory, most of the zombie viruses are 'sleeping'. When they become activated, they're goal is to launch a hefty Denial-of-Service attack upon the poor bird. Zombies are more powerful than regular viruses, and can cause a lot more damage to CyberPigeon. Stop as many as you can... Before they stop you...

You can turn on "Zombie Apocalypse" by going to Shop > Mode > Apocalypse. It will cost 0 credits. Happy Halloween!

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Join CyberPigeon on it's quest to rid the once beautiful internet of destructive malware. Equipped with the powerful and highly-upgradable, CyberBuster, it leave it's enemies shaking in their data streams.

Features:
-Easy to control gameplay
-A fun, addictive shooter
-Seven unique weapons
-Seven different enemies - with their own special attack!
-Powerups (including Holo-Pigeons and projectile reflecting sword gameplay)
-Colorful graphics
-Shop - Use credits earned in gameplay to unlock skins, game modes and minigames!

Source: http://itunes.apple.com/ng/app/cyberpigeon/id462305304?mt=8