Once you have your game connected to your Google Play account, you can use this account to load your saved progress on another device that supports Google Play.

First verify that your original game is connected to your own Google Play account on your primary device.

Open your game and go to Settings in the upper left corner of your map. If your Google Play status is “Game Saved”, your game is connected to this particular Google Play account.

On your secondary device, open the Google Play app, sign in with the same account, and install the game.

When you open it, the game will prompt you to load your save. If not, go to the settings in the upper left corner and tap “Connect” to make the popup appear.