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Find hidden treasures, track your suspects, mark secret meeting points, and create your own scavenger hunts. The transmitter emits silent, ultrason...

Includes two unique pens that allow you and your fellow agents to exchange secret, confidential messages. The pens use a special ink that becomes ...

Learn about different types of codes and ciphers that have been used throughout history--and how you can use them in your own investigations! Incl...