The best way to sync all your devices to the same account is through Facebook. If you connect with Facebook when you start playing, you'll be able to connect any device to your account through Facebook.

If you don't have Facebook, you are only able to sync your device with the same OS type. You'll be able to see your possible sync opportunities under the "Settings>Support" section

Please note, we are not able to support owning multiple accounts or if Facebook locks you out of your profile.