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cibi sarancibi saran 

I have error 404 message while opening the trailhead playground 1 it showing 404 error past 1 week it showing same error ..there is any resolved solution

I have error 404  message while opening the trailhead playground 1 it showing 404 error past 1 week it showing same error ..there is any resolved solution
Khan AnasKhan Anas (Salesforce Developers) 
Hi,

Greetings to you!

I suggest you please give a try by logging out of all accounts and log in once again in a different browser by clearing the cache and cookies which should probably do the trick.

Still, if the problem persists, I suggest you please reach out to the Trailhead support team for better and quick assistance on the above issue.

Please refer below link to open a case:
https://trailhead.salesforce.com/help?support=home

I hope it helps you.

Kindly let me know if it helps you and close your query by marking it as solved so that it can help others in the future. It will help to keep this community clean.

Thanks and Regards,
Khan Anas