To play on different devices with the same OS, you need to log in with the same Google Play account from both devices.

Here is how you can do it:

• open the game;
• tap the gear button in the upper right-hand corner of the screen;
• go to the Account tab;
• sign in with your Google Play account.

If you can't sign in, contact us via Gear button right in the game and we will help :)