However, perhaps the most famous example of a hidden passageway is what modern architects call a "murphy door," most often ...

If you encounter a locked door, you should see the Special Key option. Select it and choose the Secret Garden Key. If you meet the above requirements, that door will lead to the Secret Garden itself.

In order to use the Secret Garden Key, you must find a locked door on the furthest east or furthest west side of the mansion. Make your way to either side of the house, and continue to draft rooms ...