Remix and continue the timeline. Feel free to do whatever you want, but don't cheat or break Scratch's Community Guidelines. Each part will have 400 events (backdrops). Use the arrow keys (or click on the arrows on-screen) to change the events.
Credit to all, including: Nintendo + Tomoyuki Uchida + Sega + Djjaner + Anamanaguchi + Aarex + @TBDComedian + @B204CRises + All owners of all assets Kyle's notes: I increased the number of events to 75 and added up/down arrow control