How do I save my game progress and sync it across devices?

To sync your progress across Apple devices with the same Apple ID:

1. Tap Me in the bottom right corner of the main screen.
2. Select Settings.
3. Activate Back Up Progress on both devices.
4. On each device, go to the iPhone's settings, tap your name, then iCloud, and select Show All.
5. Enable iCloud sync for the Blockudoku app on both devices.