An internet connection is required the first time you launch the app.
You can play offline after that, but a network connection is required in the following situations:
- When launching the app for the first time
- When changing your country/region or language settings
- When purchasing game volumes
A network connection may also be required in the following situations:
- When checking for app updates
- When backing up or restoring save data to Google Play Games
- When completing achievements in Game Center / Google Play Games
- When accessing photos stored in iCloud