Rating:

No need to de-obfuscate the JS - just cheese out the flag from a compare operation.

https://advancedpersistentjest.com/2018/02/24/writeup-flag-checker-2-mario-mystery-envy-xiomara-ctf/

Original writeup (https://advancedpersistentjest.com/2018/02/24/writeup-flag-checker-2-mario-mystery-envy-xiomara-ctf/).