Code for the BBC Microbit
The Bit:Commander Code Cracker requires the Bit:Commander from 4tronix (https://4tronix.co.uk/blog/?p=1734) and was made as part of a project with BOM (www.bom.org.uk), John Sear and Warwick Museums.
John has a nice blog post on it in use here: http://johnsear.com/escape-games-for-museums-part-of-museumsatnight/