Other puzzles use a combination of sights and sounds. Like Myst, sound plays a vital part in the wonders of RHEM. One puzzle has you changing the direction of a radio antenna and part of doing that correctly is listening for a whistling sound to know you have gotten the right sequence. Other sounds blend into the background and give clues to things you must do. Before you can get the first piece of the letter you have to find where water is flowing into a pool and hiding the entrance to where this first quarter of the note lies. As you travel along a path the sound of running water gives you an indication of where you should be looking for a control to stop the flow.