By connecting the game to an email or a Apple Store or Google Play account it is possible to play your game on multiple devices.
 
To save your account click the cog icon in the bottom menu bar to enter the game settings. Here you will see three red "Disconnected" buttons, one for each method of saving your account. Simply tap the button for the option you would like. You will be asked to enter your details for Apple Store or Google Play and confim the app, or to enter your email address and set a password. Once this has been done successfully, your account is saved.
 
You can now repeat this process on another device. Once the details have been entered this time a pop-up will appear asking if you would like to save your new game or load the saved on. Selecting your original game will load it onto the new device.