Here’s how to use the snow globe in Nancy Drew: Mystery of the Seven Keys.
Once you acquire the snow globe from Patricie, hold onto it until you open Marek’s trunk all the way.
Add the small key to your inventory.
Examine your snow globe. Rotate it to see the bottom. Use the Small Key in your inventory to unlock it.
Rotate the globe to find the words, which are a clue to the underground tunnels. It says “The floods below hold secrets lost.”
The fastest way to get where you need to be is to take the ramp down to the underground tunnels from the courtyard.
Step forward in the tunnels and turn left at the first hallway.
Shift right so you see the gray relief on the wall.
Place the snow globe into the lower right key hole.
Here’s my full video showing how to do all these things and to find the gray relief.
