We're always trying to make our games run on all possible devices. For performance reasons, some devices with less memory and processing power may not be supported. Currently, Zombie Catchers supports the following iOS devices:
Devices with operating system iOS 7.0 and later
iPhone 4S and later
iPad 2 and later
iPod Touch 5th Gen and later
You can check your device type and iOS version in the Settings menu of your device.