the Kinect. Existing games also continue to thrive on new business models, such as the reliance on downloadable content to provide songs to players. The introduction of the eighth generation of console hardware has also spurred return of Activision's Guitar Hero and Harmonix's Rock Band titles in late 2015. Definition and game design Rhythm game, or rhythm action, is a subgenre of action game that challenges a player's sense of rhythm. The genre includes dance games such as Dance Dance Revolution and music-based games such as Donkey Konga and Guitar Hero. Games in the genre challenge the player to press buttons at precise times: the screen shows which button the player is required to press, and the game awards points both for accuracy and for synchronization with the beat. The genre also includes games that measure rhythm and pitch, in order to test a player's singing ability, and games that challenge the player to control their volume by measuring how hard they press each button. While songs can be sight read, players usually practice to master more difficult songs and settings. Certain rhythm games offer a challenge similar to that of Simon says, in that the player must watch, remember, and repeat complex sequences of button-presses. Rhythm-action can take a minigame format with some games blending rhythm with other genres or entirely comprising minigame collections. In some rhythm games, the screen displays an avatar who performs in reaction to the player's controller inputs. However, these graphical responses are usually in the background, and the avatar is more important to spectators than it is to the player. In single-player modes, the player's avatar competes against a computer-controlled opponent, while multiplayer modes allow two player-controlled avatars to compete head-to-head. The popularity of rhythm games has created a market for speciality input devices. These include controllers that emulate 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. However, most rhythm games also support more conventional input devices, such as control pads. History Origins and popularity in Japan (1970s–2000) In the early 1970s, Kasco (Kansei Seiki Seisakusho) created a rhythm-based electro-mechanical arcade game, designed by Kenzou Furukawa and produced by Kenji Nagata. According to Nagata, it was Furukawa's "idea for a game where you’d lift girls skirts in time to some rhythm", inspired by the 1969 Japanese Oh! Mouretsu