STAGE 1: A1: https://scratch.mit.edu/projects/639975105 A2: https://scratch.mit.edu/projects/641747973 A3: https://scratch.mit.edu/projects/641821037 STAGE 2: B1: https://scratch.mit.edu/projects/642219907 B2: https://scratch.mit.edu/projects/650677196 B3: https://scratch.mit.edu/projects/653872276 STAGE 3: C1: https://scratch.mit.edu/projects/656476056 C2: https://scratch.mit.edu/projects/656458961 C3: https://scratch.mit.edu/projects/657539291 STAGE 4: D1: https://scratch.mit.edu/projects/657571170 D2: https://scratch.mit.edu/projects/657704908/ D3: https://scratch.mit.edu/projects/657977288/
