You can play on multiple devices, but only if your game is connected to Facebook. There are also a number of requirements you have to meet before you can synchronize it: 1. You have to have the same game version on the devices you want to sync. 2. Both devices must meet the minimum system requirements. 3. Cross-platform synchronization is only available between iOS and Android devices (e.g., you can't sync games between your iPad and Facebook).
Here's how to synchronize devices: 1. Connect to Facebook in the game settings or on the title screen. 2. Install the game from the App Store, Google Play, or Amazon App Store on the second device. 3. Connect the downloaded game to the same Facebook account you use on the first device. 4. Tap Select in the pop-up window in the On server option. 5. Type OK to confirm.