I’m stuck in the Library, represented by the icon for weight. I need to get the bookcase open. I have a key, but the bookcase doesn’t have a keyhole. I think I need to find a way to create a keyhole.
Have you tried looking in the other rooms yet? Some of them may have changed.
ETA, since that probably wasn’t helpful:
The key to this puzzle lies in both the Heat and Pressure rooms.
Thank you. Sorry that I didn’t respond right away. I’m through this puzzle, now. Your hint helped.