World 4 (Super Mario 3D World)
From the Super Mario Wiki
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World 4 is the fourth world of Super Mario 3D World. It is a canyon and mountain-like island. It contains five standard courses, two Enemy Blockades, a Mystery House, a Sprixie House, and a Castle. After beating the boss, Boss Brolder, the orange Sprixie Princess will create a Clear Pipe to World 5.