Cicada 3301: A puzzle for the brightest minds, posted by an unknown, mysterious organization

It’s perhaps the most enigmatic and intriguing thing on the internet, which promises an “epiphany” when you solve it. No one knows who sets it or what the prize is at the end, but Cicada 3301 has posted mysterious, extremely difficult puzzles for three years in a row, in an attempt to recruit and enlighten the best cryptanalysts from the public.