Exchange furniture and traps with the merchants below. Furniture can only dress up as a secret base. If it's a gem played by a computer simulator, it doesn't mean much. If the secret base is upgraded to the top level, the big stones in the base can be removed, and the position of fossils can be directly detected by radar (if you play the simulator on the computer, only the number of times you hold the flag in the editing of the record type can be modified by the modifier). Anything you can find and like.

Where things change in the underground world.

Red dots turn into traps, blue dots into furniture, and black dots into gems.