One thing worth mentioning: the original hard copy of the game came with a printout of The National Inquisitor which is 100% required to solve several of the puzzles in the game. Most of the scans I found of it are completely unreadable, but I did find a high-quality scan here: https://openretro.org/file/6359141ccb61f63f2f57d3571b516b283a553171/Paper%20%28en%29.pdf

There’s no way I would have figured out how to solve the dolphin puzzle without it!

Regarding graphics and sound quality – I didn’t figure out until half-way through my playthrough that my copy also came with the FM Towns version. If you purchased a digital copy, you most likely have it too. You can access it by hitting F5, then “Return to Launcher” and select “FM Towns”. This version has superior graphics and sound, additional music and background effects. It even includes some easter eggs you won’t find in the original, such as a poster of Maniac Mansion on the wall of the Mindbender machine, and the kazoo song is the Indiana Jones theme instead of “Pop Goes the Weasel”. Sometimes the backgrounds can be a bit muddy in this version, making it harder to pick out objects, but I’d recommend it just because you can see a whopping 10 items in your inventory at a time, rather than 4!