The Cipher Squad and the Sealed Envelope:: Logic Puzzles & Brain Teasers for Kids Ages 9–12: 70 All-New Detective-Themed Puzzles: steganography · matrix ciphers · logic paradoxes (Volume 3)

The Cipher Squad and the Sealed Envelope:: Logic Puzzles & Brain Teasers for Kids Ages 9–12: 70 All-New Detective-Themed Puzzles: steganography · matrix ciphers · logic paradoxes (Volume 3)

Independently published

Pages: 94, Paperback, Independently published

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