Latest ref: https://scratch.mit.edu/projects/1093255969 5th ref: https://scratch.mit.edu/projects/899911924/ 4th ref: https://scratch.mit.edu/projects/856729362/ 3rd ref: https://scratch.mit.edu/projects/818046544/ 2nd ref: https://scratch.mit.edu/projects/748727145/ 1st ref: https://scratch.mit.edu/projects/704330003/
Zoom in code taken from here: https://scratch.mit.edu/projects/480997394/ Everything else by me.
