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 Community 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 :)