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Are any of the paintings important?

1. One of them is.
2. But only one.
3. It has a hot spot.
4. It's on the second floor.
5. It's in the master bedroom.
6. The painting of a woman in a red dress, holding a crystal ball.
7. If you click on the crystal ball, the painting swings aside and reveals a wall safe.
   • How can I open the wall safe?

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