if Marshmellow is upside down, click on him. if you can't see him, press space. press x to start Marshmellow dancing. when he stops, click on him. then press the up arrow and see what happens! to reset, press the space bar and click on him.
Thanks to Marshmellow for doing what I tell him! Otherwise, thanks to Emily from the library for teaching me how to do this! Thanks to Fantasy Name Generator for Marshmellow's name!