The white Kirby represents the Boo, a white, spherical ghost enemy whose design includes simple back eyes, stubby arms, and has the ability to float in midair. The stage represents World 2-Fortress, the second fortress stage in Super Mario Bros. 3, and the level in which the Boos first appeared in Super Mario Bros. 3. The music track is a remix of the theme to the Luigi's Mansion series, which features the Boos as the main antagonists. The Invisibility rule references the Boo's shy personality, which causes them to turn transparent and invincible when faced by the player.
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The spectral inhabitants of the Mushroom Kingdom’s many Ghost Houses, Boos have crippling anxiety, freezing in place as soon as Mario so much as glances at them. Despite this, Boos have been known to overcome their fears to play a game of tennis or golf, or even just to party with Mario and his friends.