Tools and the beautiful mallets are visible for picking up. However, I couldn't find the last (pink) mallet until I watched the walk through. It's hidden in a drawers room where a silver is found. Check the bottom leftmost jammed one.
Puzzles require some thinking to solve. Jotting clues and tasks on a piece of paper will help.
I don't like the raining sound effect, it's too noisy and distracting.