Mario and Sonic X Kingdom Hearts

Mario and Sonic X Kingdom Hearts is a Japanese-American action role-playing video game published by Nintendo, Sega, Disney Interactive Studios, and Square-Enix, and exclusively published for the Nintendo Switch. It is a huge collaboration of Super Mario Bros., Sonic The Hedgehog, Disney, Final Fantasy, and The World Ends With You

Summary
Mario and Sonic has to help the Super Mario Bros., Sonic The Hedgehog, Disney, Final Fantasy and The World Ends With You characters during their quest to stop the evil witch.

Gameplay
you can play as Mario, Sonic, or other Mario, Sonic, and Kingdom Hearts characters (ex: The Koopalings (Larry, Morton, Wendy, Iggy, Roy, Lemmy, and Ludwig) Tails, Amy Rose, Sora, Kairi, Riku, Terra, Aqua, Ventus), along with CPU characters along the quest of the video games and movies.

Worlds/Dimensions for Mario, Sonic, and others

 * Mushroom Kingdom (Super Mario Bros.) (1985)
 * Green Hill Zone (Sonic The Hedgehog) (1991)
 * Mugwomp Flats (The Rescuers Down Under) (1990)
 * 1897 London (The Great Mouse Detective) (1986)
 * Big Top (Dumbo) (1941)
 * Nottingham (Robin Hood) (1973)
 * Prydain (The Black Cauldron (1985)
 * Alice's World/Wonderland (Alice In Wonderland) (1951)
 * Prankster's Paradise (Pinocchio) (1940)
 * Agrabah (Aladdin) (1992)
 * Dwarf Woodlands (Snow White and The Seven Dwarfs) (1937)
 * Neverland (Peter Pan) (1953)
 * DeVil Mansion (101 Dalmatians) (1961)

Soundtrack (Sarah West will edit this category)

 * 1) Air Supply's Even The Nights are Better (1982) (opening) (where Mario and Sonic teams up with the heroes of Super Mario Bros., Sonic The Hedgehog, Disney, Final Fantasy, and The World Ends With You)
 * 2) Barry Manilow and Sheena Easton's Now and Forever (1995) (ending) (where the worlds are in peace again after the final battle)