@PLady100
The room you are talking about is called Great Grandfathers Stash, in this room use the "Circuit" from your inventory. This will light up the screen allowing you to see the hidden object room, the wall and the room are one in the same.
I will post a few more that I was reading on the comments section.
First Flight: To get the Map Key which is in the highlighted area upper right, you have to flip switches to create the numbers. Here is the order, press done when you complete each one. I am posting the order in numbers from 1-7, starting at the top.
A= 1,4,5,6
B= 2,3,4,6,7
C= 1,3,4,5,6,7
Cottage Attic: This is where you will find the Crowbar that you have to use on the Manhole Cover. It is located on the middle upper left of the screen.
Abandoned Lab: This is where you use the code from the Mayan Valley that is in your inventory. The highlighted area will open a touch pad some call the safe. Enter the code 817
Abandoned Room: This is where you get the Telescope. The Iron is in the upper middle right by the stop sign. Use the Iron on the glowing area. It will say "That's The Card". Then open the Freezer if you haven't already, and place the hot Iron on the Ice.
Hope some that couldn't access the Forums, or Join, will read this thread! You don't have to login to read, just to post.
@Terrie218
Hopefully someone with better technical experience than I have will come and answer your question.
I am now going to get some sleep, lol
Suki
P.S. They do switch some of the items you have to find when you play again, but the main ones remain the same.
You cannot leave the room until you have those key items and the items on the list unless you go to the menu. At least I couldn't, rofl