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Secret Box is an item found in Mario & Luigi: Dream Team. It is a blue box with a ? on its cover. When used, it inflicts a random effect on Mario, Luigi, enemies, or all in the battlefield. It acts much like a Mystery? in Paper Mario, a Mystery in Paper Mario: The Thousand-Year Door and a Mystery Box in Super Paper Mario. The effect of Secret Box can be almost anything. It can heal Mario and/or Luigi, cause damage on enemies, give all a random status effect, or even KO all in the battlefield at once.