Levels 1-3: https://scratch.mit.edu/projects/105500895 Levels 4-6: https://scratch.mit.edu/projects/118638917/ Levels 7-8: https://scratch.mit.edu/projects/120721851/ Levels 9-13: https://scratch.mit.edu/projects/140185501/ Levels 14-15: https://scratch.mit.edu/projects/194164289 Levels 16-21: https://scratch.mit.edu/projects/194895616
