the Hedgehog. He is the only playable character in Sonic Unleashed (2008), in which he unwillingly gains a new personality, "Sonic the Werehog," the result of Sonic being fused with Dark Gaia's power. He gains strength and flexibility in exchange for his speed, and new friends including a strange creature named Chip who helps him along the way. In Sonic Colors (2010), Eggman tries to harness the energy of alien beings known as "Wisps" for a mind-control beam. Sonic Generations (2011) features two playable incarnations of Sonic: the younger "classic" Sonic, whose gameplay is presented in a style reminiscent of the Mega Drive/Genesis games, and present-day "modern" Sonic, who uses the gameplay style present in Unleashed and Colors, going through stages from past games to save their friends. Sonic Generations features various theme songs including modern and retro versions that are able to be selected from throughout Sonic's twenty-year history. In April 2013, Sega announced that Sonic Lost World would launch in October 2013 for the Wii U and Nintendo 3DS. Sonic and the Secret Rings (2007) features Sonic in the storybook world of One Thousand and One Nights. A sequel, Sonic and the Black Knight (2009), continued the storybook theme, this time taking place within the realm of the Arthurian legend. Sonic has also been featured in other games of many genres other than 2D and 3D platform games. These include Sonic Spinball, Sonic Labyrinth (1995), the racing games Sonic Drift (1994), Sonic Drift 2 (1995), Sonic R (1996), Sonic Riders (2006), Sonic Rivals (2006), Sonic Rivals 2 (2007), Sonic Riders: Zero Gravity (2008), and Sonic Free Riders (2010), the fighting games Sonic the Fighters (1996) and Sonic Battle (2003), the mobile game Sonic Jump (2005), and the role-playing video game Sonic Chronicles: The Dark Brotherhood (2008). Video games such as Dr. Robotnik's Mean Bean Machine (1993), Knuckles' Chaotix (1995), Tails' Skypatrol (1995), Tails Adventure (1995), and Shadow the Hedgehog (2005) starred supporting characters of the Sonic series, although Sonic himself cameos in most of them. Cameos and crossovers Sonic makes cameos in various other games, such as Billy Hatcher and the Giant Egg as a power-up, in the main hallway in Phantasy Star Universe, and in the 2008 remake of Samba de Amigo. He is also a playable character in Christmas NiGHTS into Dreams. Nintendo, Sega's former rival, references Sonic in Donkey Kong Country 2: Diddy's Kong Quest,