To transfer your account between iOS devices, please link it to Apple Game Center.
Current Device:
1.) Sign in to the Game Center account that you'd like to link with the game.
2.) Open the Menu from the Home screen, then select [Account Transfer] → [Link to Game Center].
3.) Double check the player name and rank displayed on the screen, then press [Link] if it is the correct account.
Once you've successfully linked your account, the [Link to Game Center] button will change to [Unlink from Game Center], and a pink "Linked" icon will be displayed over the button.
*Please note that the option to link to Game Center may not be available depending on your app settings.
New Device:
1.) Sign in to the same Game Center account that you linked with.
2.) On the title screen, open the Menu using the button on the upper right corner, then select [Account Transfer] → [Link to Game Center].
3.) Double check the player name and rank displayed on the screen, then press [Account Transfer] if it is the correct account.