Cicada 3301: Who Built the Internet's Hardest Puzzle?

Cicada 3301 started in 2012 as one strange post, and most of Liber Primus is still unsolved. Here is what it was, in 40 seconds.

Cicada 3301 explained: a message hidden inside an image, ciphers, real-world locations, then Liber Primus, a book written in runes. The group never said who it was. The three common theories, a recruiting test, an art project or game, and a privacy society, are theories, not facts. Which would you bet on?

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