Nine intercepts. One last transmission. Breaking the code is only the beginning.
Intercept, identify, decode, verify, interpret and judge across nine increasingly demanding files built on historical ciphers. Clear all nine to unlock D’s Final: The Last Transmission.
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All Cipher Office files and D’s Final are fictional training exercises designed for GrandpaSpy. Names, stations, messages and records are invented. The historical ciphers used here are for learning only and are not secure.