The two "harder rooms" are still the Old West and Biff's Museum. I think we finally figured out the West room, but they moved us along mid-puzzle so IDK if we were right. Biff's Museum, we did figure it out, but it wasn't recognizing our answer. We asked a TM after the game to make sure if we did do it right. She confirmed we were right, but didn't know why it didn't allow us to move on. She offered a redo, which was nice, but not necessary for just one technical blunder. Still, that room isn't very clear on how to break the code so it's kinda annoying.