http://scratch.mit.edu/projects/SmartIrishKid/636418
Now there are 10,000 different codes available! Instructions are in-game, and in the project notes. The code is a multiple shift cipher, repeating every 4 characters.
This was partially inspired by a Codemaster program I found on a Boy Scouts website.
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You should make a mono alphabetic substitution cypher O.o
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