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Scott TBID2Scott TBID2 

I am not able to launch trailhead playground, and the web page is showing 404 error whenever I am trying to launch the TP.

Not sure what is wrong
DishantDishant (Salesforce Developers) 
Hi Scott,

You can try the same in Incognito mode, login trailhead in Incognito mode and then launch playground and if it still doesnt work then try to change country = USA

Also, Please find one of the same questions posted on another platform. It has a best solution given there. 

404 error in Trailhead (https://developer.salesforce.com/forums/?id=9062I000000XoRuQAK)

Please mark this as a best answer if this information helped you! 
Thank you!