Rating:
Hi CTF player. If you have any questions about the writeup or challenge. Submit a issue and I will try to help you understand.
Also I might be wrong on some things. Enjoy :)
(P.S Check out my CTF cheat sheet)
The page is quite simple, a text field and a button.
Looking at the source:
Seems like if you type in the correct password it calls GetThat('Y')
We can manually call that function in the Developer Console: