Below is my four part tutorial series on how I created a Simon Says game using Scratch 3.0 and Makey Makey. I hope it is helpful as you learn on your own or in the classroom. Feel free to reach out with any questions or comments.

Scrach code for basketball version – https://scratch.mit.edu/projects/305226444

Scratch code for starfish version – https://scratch.mit.edu/projects/305224650/

Scratch 3 0 + Makey Makey = Simon Says Game Part 1: Sprites

https://www.youtube.com/watch?v=x_-cFeZ-wQs

Scratch 3.0 + Makey Makey = Simon Says Game Part 2: Random List for Colors

https://www.youtube.com/watch?v=u5TUWikr2tY

Scratch 3.0 + Makey Makey Simon Says Game Part 3: Finishing Touches

https://www.youtube.com/watch?v=5F_koI1KQcE

Scratch 3.0 + Makey Makey Simon Says Part 4: Game Console

https://www.youtube.com/watch?v=e54ePC2_fa4