Worlds United: The Muses' Quest

Kingdom Smash Brothers: The Legacy Continues is a Japanese-American action role-playing game developed by Nintendo and Square-Enix.

Plot
A boy named Corey  enters the world of video games of video games, and must put together a new group of Smashers, and Keyblade Wielders.

Gameplay
You can play as Corey, one of his teammates, one of the Smashers or the Keyblade Weilders, or you can custom create your own character.

Worlds/Levels

 * Corey's City
 * Mushroom Kingdom
 * Jungle Japes
 * Hyrule
 * Brinstar
 * Dream Land
 * Corneria
 * Pokemon Stadium
 * Mute City
 * Onett
 * Icicle Mountain
 * Flat Zone 2
 * Castle Siege
 * Skyworld
 * Distant Planet
 * Shadow Moses Island
 * Green Hill Zone
 * Smashville
 * Boxing Ring
 * Dr. Wily's Castle
 * Pac-Land
 * Suzaku Castle
 * Umbra Clock Tower
 * Band Land
 * Liberty City
 * Bullworth Academy
 * 1947 Los Angeles
 * N. Sanity Beach
 * Artisans
 * Twilight Town
 * Wonderland
 * Mousedom/221 Baker Street
 * The Ringmaster's Big Top
 * Mugwomp Flats
 * Virginian Colonial Tribes
 * Space Paranoids/The Grid
 * Prydain
 * Pixie Hollow/Neverland
 * Swamp of Frogs
 * Symphony of Sorcery
 * Prankster's Paradise
 * Andalasia
 * Toon Town
 * Port Royal
 * Halloween Town
 * Atlantica
 * Castle of Dreams
 * Dwarf Woodlands
 * Enchanted Dominion
 * Beast's Castle
 * Agrabah
 * Pride Lands
 * La Cite de Cloches
 * Olympus Coliseum
 * Land of Dragons
 * Midgar
 * Shibuya

Main

 * Corey Randolph
 * Sophie Mansfield
 * Dimitri Fleischer

Trivia

 * The game is rated E10+ due to fantasy violence.