Luigi is a fictional character featured in video games and related media released by Nintendo. Created by prominent game designer Shigeru Miyamoto, Luigi is portrayed as the slightly younger but taller fraternal twin brother of Nintendo's mascot Mario, and appears in many games throughout the Mario franchise, often as a sidekick to his older brother.
Mario is called back to Isle Delfino to clean up more magic paint spread all over the islands. Some new threat is causing this whole island to sink to the bottom and Bowser and all of Mario's friends have disappeared.
