Sound design can be especially powerful. Instead of using music only as background entertainment, platform games can use sound as a form of communication. A particular sound may indicate that a hidden route has been discovered. Another sound may warn players that the environment is changing. Successful actions can produce satisfying audio feedback, while approaching a major challenge can gradually increase the intensity of the music. In a dark or mysterious environment, sound can even provide clues that players cannot see. This makes the experience more immersive because visitors are encouraged to listen as carefully as they look.