Cicada 3301 Puzzle

Tackling the puzzle would lead Eriksson to rely on a host of skills from steganography to cryptography, to an understanding of ancient Mayan numerology and a familiarity with cyberpunk speculative fiction. As he worked his way from solving one piece of the puzzle to the next, the journey would lead him to discover that the answers lay not just in the digital domain, but in the real world: From clues left on the voicemail of a Texas telephone number to flyers taped to telephone poles in 14 cities around the world. The quest would ultimately return to the deepest layers of the digital world: the dark web.

Not that I have any clue how to solve any of those puzzles, I find them highly fascinating and I love reading such stories. If you’re smarter than me and if you want to try it yourself start here.