Top Secret Decoder:
This template comes in 2 parts- outer and inner circles. They're easy to cut and inner circle has thick black outline to overlap outer circle artwork.
The PDF contains 2 different logos in the center for you to choose (Detective Academy and Detective Decoder).
Print, cut circles out (inner and outer), and add a brad to spin it. Set the key by aligning letter and number you desire (example: set key to A2, create message).
See Scavenger Hunt worksheet included for example on making secret messages.
This is a one page Word doc that I used during first day of class. My students loved using their decoders.