These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
YMMV: Mystery Of Time And Space
Seinfeld Is Unfunny: Nowadays, with many beautifully-rendered and complex escape-the-room games out there, MOTAS looks rather dated; its puzzles, while not easy easy, wouldn't be called "hard" by seasoned gamers the way it was called by some gamers in the past; and its plot is rather sparse compared to some of these games.
That One Puzzle: The green wall. If you don't know the trick to doing it, you'll probably be fiddling with it for a long time.