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A mystery box is a box that appears in Ultra Mario Kart. Within it is an item that proves very useful in the adventure.
Useful Items and their Effects
Mario-Fireflower-Mario Can shoot fire Luigi-Grassplant-Luigi cannot be harmed by grass-based enemies for a limited time, takes twice as much damage from fire enemies Wario-K.O Grenade-Anhilates the entire area, damages everyone excluding the user Waluigi-K.O Grenade-Anhilates the entire area, damages everyone, including the user Feng-Cometrose-Feng can shoot comets Xun-Fireplant-Xun cannot be harmed by fire-based enemies for limited time, take twice as much damage from water enemies Zhang-Bob-omb-Destroys the area, inflicts damage on all enemies Shun-Bob-omb-Destroys the area, inflicts damage on enemy and ally alike