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This article is about the secret boss that appears in Moonview Glacier from Newer Super Mario Bros. DS. Not be confused with Boolossus, the main boss of Pumpkin Boneyard from Newer Super Mario Bros. Wii.

King Boo
King Boo DarkMoon
Game(s) Newer Super Mario Bros. DS
Appearances (DS) The House of Stairs
Related enemy Boo
Boolossus

King Boo is a secret boss that appears in Newer Super Mario Bros. DS. He's only fought in Moonview Glacier's The House of Stairs, where he is blocking the secret exit that leads to World 5-Cannon.

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