Welcome to the Pet Rescue Community
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Good morning and welcome to the community. It sounds like it possibly needs updating, have you checked for any updates in case they changed the requirements? They do that a lot.
I will tag @Lynette as well while I go and hunt for one of her videos, to see if she knows of any issue 😊
Edited to add, it was updated and changed to 12.
Check for updates if you haven't already.
Make sure you have 2GB free.
If that doesn't help, please come back and let us know the make and model of your device, the operating system version, the game app version and your player ID please. If you need it, it explains how to find that here How can I find my player ID? - King Community