World 4 (New Super Mario Bros.)
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World 4 is a secret world in New Super Mario Bros.. If Mini Mario or Mini Luigi defeat Mummipokey in World 2 they will go to World 4 instead of World 3.
World 4 is a giant forest with many enemies like Wigglers. Also, much of the water here is so polluted that it eminates an eerie purple color and grants instant death, regardless of what form Mario/Luigi is in (even in Mega form). Bowser Jr., like in every world, is fought here, and a Ghost House is also located here. Mega Goomba is the big boss of this world.
