Press the Green flag and enter a passage encrypted with a Vigenère Cipher. The program does its best to figure the key out itself, so there is no way to enter a key. The encrypted message must only contain letters (No symbols, spaces, numerals, etc..)
There is not much too this project, I just took known methods of decrypting the Vigenère cypher and ported them to Scratch. It does not work very well with small passages or large keys.