If your games graphics are corrupted, or showing black squares, on your tablet or phone try closing and re-launching the game. If the problem persists try checking the amount of free space available on your device. We recommend having at least 1 GB of free space to ensure that the game runs smoothly. Additionally, you may try to uninstall and reinstall the game.
If the above does not resolve the issue please contact our Support team with your devices details and a screenshot so we can help you resolve the problem as quickly as possible.