Input what you want it to encrypt/decrypt. It knows what you are trying to do based on the input, so you don't need to specify. If you input both characters for Encryption and characters for Decryption, it will prioritize Encryption. NOTE: It takes many times longer for it to encrypt than it takes to decrypt. It would be much faster if Scratch was Case-Sensitive. Python Equivalent in code if you want it. Supported Characters for Encryption: !"#$%&'()*+,-./0123456789:;<=>?@ ABCDEFGHIJKLMNOPQRSTUVWXYZ[\]^_`abcdefghijklmnopqrstuvwxyz{|}~€‚ƒ„…†‡ˆ‰Š‹ŒŽ‘’“”•–—˜™š›œžŸ¡¢£¤¥¦§¨©ª«¬®¯°±²³´µ¶·¸¹º»¼½¾¿ÀÁÂÃÄÅÆÇÈÉÊËÌÍÎÏÐÑÒÓÔÕÖרÙÚÛÜÝÞßàáâãäåæçèéêëìíîïðñòóôõö÷øùúûüýþÿ ALSO SUPPORTS: tab/indent character AND space character Supported Characters for Decryption: ΛΔΞΘΩΦΨ