You become an intelligence analyst with access to intercepted transmissions. Your task is to decrypt them, find the patterns and gradually uncover a hidden story. Start with simple ciphers and work your way up to harder methods: the Caesar and Vigenère ciphers, affine and matrix ciphers, sequences, graphs and other mechanics. Every case is a new problem, and every answer brings you closer to the main question: who is sending these messages, and what are they trying to hide? Explore dossiers, unlock new cases, take on demanding challenges and test your skills in daily assignments. Can you break the message before the time runs out?