The Nintendo GameCube is Nintendo's 4th generation home game console. Released in 2001, it represented Nintendo's entry in competition against "sixth-generation" consoles such as Sony's PlayStation 2 and Microsoft's XBOX. Although the GameCube possessed superior graphics to its main rival, the PlayStation 2, it lacked the ability to play DVDs. It also tended to skew to a younger audience, with games like Pokemon. The Legend of Zelda: The Wind Waker is one such game that was marketed for a younger audience. Released in 2003, this entry was significant for being the first endeavor in the series to use cel shading. Cel-shaded graphics are computer rendered designs that make the images appear as if they were hand drawn. The Wind Waker has a more cartoonish and simplistic appearance as a result. While a successful venture for Nintendo, selling over four million copies and introducing many younger individuals to the franchise, the game's graphical style incited controversy among players. Many longtime fans desired a return to the more realistic and mature art style made famous by The Legend of Zelda: Ocarina of Time and The Legend of Zelda: Majora's Mask. Nintendo released The Legend of Zelda: Twilight Princess in 2006 with this goal in mind. Twilight Princess is significant for being the only official game in the series to earn a "T" (Teen) rating from the Entertainment Software Rating Board (ESRB). For reasons of fantasy violence and animated blood. The game features an older, teenaged Link as the hero. He journeys through the mythical kingdom of Hyrule with the assistance of Midna, a member of the Twili race who resides in the Twilight Realm, an alternate dimension shrouded in twilight. Traveling between Hyrule and a darker, twilight-influenced version of the kingdom, Link must battle the mysterious sorcerer Zant in order to save his homeland. Link can also transform into a wolf in the game. Players can traverse towering dungeons, monumental mountains, and other areas normally inaccessible to humans in this form. Originally released for the GameCube, Nintendo also ported Twilight Princess to the Nintendo Wii as a mirror image of the original. Since Link is traditionally left handed, the game was flipped in order to make the new version more accessible to gamers using the Wii Remote. The Legend of Zelda: Twilight Princess ultimately sold over seven million copies, making it the second highest grossing entry in the franchise and one of the most successful games of all-time.