This app now supports the use of iCloud, which means it's possible to change devices and continue playing, provided you use the same Apple ID on both devices.

If you have backed up save data to iCloud prior to changing devices, you can play from the point you last saved by downloading the save data from the Cloud server.

To save data to the Cloud, simply tap the "Cloud save icon" on the title screen. For futher information about using iCloud, please contact Apple Support from the link below:

http://www.apple.com/support