“It's unlikely to be a spoof due to the lengths [Cicada 3301] have gone to. They are really sophisticated; they have all kinds of amazing, esoteric references in there to the work of [occultist] Aleister Crowley, for example, paintings by William Blake, and Maya numerals. It takes a long, long time to set up puzzles like this. It's not something you can do in your spare time."