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Hi Miriam, I know we have had a lot of issues with the Mystery Mountain. It was meant to have been fixed.
I am going to message a King moderator and find out if they are aware of any more issues.
In the meantime, you might have already tried it, but can you check the troubleshooting here please?
If that doesn't work, can you also let us know the OS of your computer, which browser you are using and a screenshot would be great of the locked screen. Thank you