Yet another "guess what to do (hard) then do it (easy)" challenge.
I hate those. And the main page welcomes us with the promise:
"The challenges test your knowledge and skills in the following areas:
Programming, Mathematics, Logic, Puzzle, Cryptography, Steganography, CGI Security".
Why then the skills in Guessing are put to test instead?
PS A small, moderte amount of guessing is fine. It adds fun to problems. But in my opinion there is way too much of it.