I don`t know if helps but I have already deleted the cookies, but the error continues.
Try reloading maybe?
I already tried that too.
Dunno, then. R u like logged in?
Yes!!! I already tried that too 
@Quidam try contacting support@codecombat.com
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Sometimes weird things just happen. It’s very frustrating.
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And it only adds to the 50 gazillion things they have to fix. (That was sarcasm)
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This happened to me using chrome. I tracked it down to a CORS error on this page
https://codecombat.com/play/level/treema.css.map
Access to fetch at 'https://codecombat.dexecure.net/play/level/treema.css.map'
from origin 'https://codecombat.com' has been blocked by CORS policy: Request
header field accept is not allowed by Access-Control-Allow-Headers in preflight response.
The code editor appears in Firefox but not Chrome(ium) browsers.
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