I coded the problems from https://data.artofproblemsolving.com/course-docs/diagnostics/python2-pretest.pdf For Fibonacci, wait until all clones disappear Fibonacci only works until 14, but could be infinite if the clone limit was removed I think Fibonacci is impossible in scratch or at least in one sprite because custom blocks only stay at one script, broadcasts can't have parameters, and scratch has a clone limit. Interestingly enough, I actually kind of modeled the coronavirus. The clones can be thought of as infected people and the clone limit as the capability of hospitals. There is a constant increase of clones/infected that follows a parabolic curve. When the number of clones/infected people reaches the clone limit/capability of hospitals, the clones/infected people start not appearing/dying. By adding the say calculating block and adding wait blocks/hygiene and lockdown, I made the project take long enough that I could go up to 14 in Fibonacci. However, the clones also appear longer meaning it's not that similar and I can't go to 15. It's also kinda ironic how I added "calculating" like fake loading screens and the code would work perfectly without it but it is still required for the project to work better