To start, click on the green flag. Click on M, R, or S to see and hear something surprising. With Makey Makey connected, use space bar for F, up arrow for U, down arrow for G, left arrow for L, and right arrow for E.
This was one of my first projects (created with Scratch 1.4) and remains one of my favorites! I am remixing it at the occasion of a NoVA ScratchEd Meetup, where we'll demonstrate some Scratch & Makey Makey magic!