We have a big hint about this task in the description: dig deep.
dig is a util to lookup the dns domain properties.
We have a domain: code-quest.devboost.com.
so let's check
its TXT field with help of:
dig -t txt example.com +short
+short is used for minified output.
So our result is: /you-are-a-finisher
After that you just need to submit your e-mail to recieve a prize. I got just a cup.