in some rhythm games, the screen will display an avatar who performs in response to the player's button-presses. however, they are usually in the background, and the avatar is less important to the player than it is to spectators. in single-player mode, the player's avatar will compete against a computer-controlled opponent, while multiplayer mode will allow two player-controlled avatars to compete head-to-head. the popularity of rhythm games has created a market for different controllers. these include a variety of controllers which look like musical instruments, such as guitars, drums, or maracas. a dance mat, for use in dancing games, requires the player to step on pressure-sensitive pads. traditional control pads may also be used.