This is a full-fledged programming language built inside of Scratch. It offers many quick options, like python. The language is not case sensitive, and uses prefix notation. A typical command is written like this: commandname arguments, where all the arguments are separated by spaces. Try this: add 4 5. You can get a list of procedures by using this: sort join kw pr There is a built-in help system. Choose any item from this list of procedures and put apostrophes on either side. Then, use this code: help 'commandname'. Try help 'add', for example. this mod introduces two new command fist one is 'clr' and the second one is 'setChar' they both do what you think they do also they have help documentation for more info