The clues were a series of riddles that had 13, 1, 8, and 5 somewhere in their text. Try letters of the alphabet, you wind up with MAHE. What if 1 and 8 was 18? 13, 18, 5 is MRE. “Mister E.” “Mystery!” “And what’s another word for mystery?” “Enigma!” Mister E. Nygma. Edward Nygma."
Which manages to be extremely basic yet such a stretch at the same time.