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Cicada 3301 is one of the most mysterious and difficult online puzzles, which first appeared in 2012. A series of puzzles launched by an anonymous group has attracted the attention of fans of cryptography, art and literature. Participants solved hidden messages using ciphers, steganography and ancient texts, finding clues around the world. Despite popular theories that Cicada 3301 is associated with recruiting for intelligence agencies or hacker communities, the true purpose of these tests remains unsolved. The mystery of the Cicada still intrigues and inspires puzzle lovers around the world.