The Nintendo GameCube (commonly shortened to GameCube, NGC, or GCN) was released on November 5, 2001. It was Nintendo's sixth generation game console, the same generation as Sega's Dreamcast, Sony's PlayStation 2, and Microsoft's Xbox. Until the console's unveiling at SpaceWorld 2000, the design project was known as Dolphin—this can still be seen in the console and its accessories' model numbers. The GameCube is the most compact sixth generation console. The GameCube is Nintendo's first game console to use optical discs rather than game cartridges. An agreement with the optical drive manufacturer Matsushita led to a DVD-playing GameCube system named the Panasonic Q, which was only released in Japan. Much of Nintendo's core line-up centered on sequels to their established hit franchises such as Super Mario Sunshine, Super Smash Bros. Melee, The Legend of Zelda: Wind Waker, Metroid Prime, Pokémon Colosseum, and Star Fox Adventures, while new franchises like Animal Crossing and Pikmin were born, although the former franchise had seen a Japan-exclusive release on the N64. The GameCube has sold 21.74 million units.