arrow keys or click sides of screen I hope I didn't make a mistake, that would be embarrassing :\ Thanks to everyone who gave feedback on the previous "is really simple". Special thanks to @Dinosu for requesting me to make this, I have learnt so much while making it. Music: Chopin - Chromatic Etude Op.10 No. 2 Played by Dimitri Shishkin And: Chopin - Heroic Polonaise Op. 53 Played by "Rousseau" Differential Calculus is Really Simple: https://scratch.mit.edu/projects/1201169515 (just in case)
