It is a riddle style that is hardly used anymore in modern games. its from the depths of the old Sierra adventures.
(going back and forth from locations and even switching realities to solve a puzzle)
On the let pillar are numbers.
Then you click on the green circle over the cave, then lets you end the game.
On the laptop then is a new button on screen that turns on the UV light above the Schubert painting, telling you where to go.
The you leave the mansion and drive via subway there.
In the doctors office, there is a periodic table on the wall, compare the numbers with the elements and you get eh password.
Go back to the mansion, start the game again and you can access the pad on the right side of the cave.
