The puzzle is a wooden box with metal xylophone keys on top, along with a mallet. The front of the box is a different color and has hinges on the bottom, although it is locked.
So how do you get in?
The puzzle requires an extra clue hidden elsewhere in the game. This clue would give a hint to the correct sequence of keys to play. It can even be in the form of a cryptic message burned into the lid of the box, or notes played when another clue is activated.
When this sequence of notes is played, the box will unlock. The sequence can be any length. There is also an option for the sequence to be capable of being reset after construction.
Check out the video below: