This document provides instructions for creating a Mexican code wheel that can be used for escape room activities. Participants are instructed to cut out wheels from A3 paper, stack and pin them together on a card. To encrypt a message, four numbers are lined up under the letter "A" on the wheel. Each letter in the message can then be represented by one of the four numbers, allowing the message to be encrypted. A link is also provided to an online tool that can automatically encrypt messages using the four number code wheel setting.

1. From RJ Tarr at www.activehistory.co.uk
Mexican Code Wheel for “Escape the Room” activities (TIP: print onto A3 paper)
Cut out these wheels, stack them together and pin them together onto a card. To encrypt a message, line up four numbers under the “A” (for example the
standard setting is 01, 53, 27, 79). Each letter in your message can now be represented by any one of four numbers. A weblink to an online tool which enables
you to automatically encrypt your message by simply giving it your four number setting can be found at www.activehistory.co.uk/escape_room.