Some players are currently experiencing an issue where their screen suddenly freezes in a darkened state, and they can't continue playing.
We’re sorry for any inconvenience caused, and are investigating the issue.
Meanwhile, we've created a workaround:
1.- Tap on the dark frozen screen 5 times, and a hidden close button (X) will appear
2.- Tap on that button and you will be able to return to your game without having to restart it
We hope this will help you out until the solution is in place. ☺️
Thanks a lot for your patience!