Press the green flag twice. Edit the sliders than press space. If you want to stop in the middle of one press S. Press C to clear. Cool ones to try: •83,1,0,135,250 •185,1,0,189,250, then switch rainbow to 0 in the middle. •77,1,100,200,250 •185, 1, 100, 200, 250
Part of the coding is from @noamkoren 's "Turtle Graphics" project.