There is a "puzzle" in Riven that I got stuck on for hours, just searching the map looking for anything that I had left to do. I couldn't find any more interactable things that hadn't been done. Then I looked it up and found it was a door that you had to enter then turn around and close to find the hidden passageway behind it. There was no puzzling value to it being hidden like that, it was something you either simply found or didn't. I put it down to old-style game design that hadn't yet learned what not to do in a somewhat open world game.

Honestly this iteration could move the entrance like one metre to the left so it's not hidden and it would be a better game for it.