This puzzle tricks you. The statue beside note is a hint. You must go to the haunted house, inside is a big statue. Either levitate or break it. Key to cave is behind it.

Make sure you have at least 2 potions of cat for and 1 speed potion. Exit castle. Go left, there’s a pathway you can hardly see. Pass haunted house. There’s a river with waterfall. Enter waterfall. Go to dragon. He flies you to the caves. Climb down ladder and navigate caves. There’s a broken bridge but a wooden beam to left. Jump on it. Use cat potion. Climb to top and enter little tunnel. Go down beams on other side. Return to human form. Navigate new part of caves. Hamlin is stuck above door. Enter door under him. End of hall is his staff. On the way back the walls slam on you. Use speed potion to get across. Exit cave. You’ll have to walk up beams of wood in cat form again. Climb ladder back to dragon.