To run this in your own project save to your backpack the setup, encode, and decode scripts. Run the setup script first before ever running the encode or decode script. I couldn't allow for users to send what they've encoded over cloud since it would then be considered a chat room, and that's against Scratch's TOS, but you can send your username if you want others to see you're encoding!
Made by me, no need to credit if you'd like to use it. Learn more about cloud variables: https://en.scratch-wiki.info/wiki/Cloud_Data Learn more about encoding: https://en.scratch-wiki.info/wiki/Global_High_Scores