World 3 (Super Mario 3D World)
From the Super Mario Wiki
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World 3 is the third world of Super Mario 3D World. It's a snow-themed island surrounded with ice blocks. It lies southwest of World 1, south of World 2, west of World 4, east of World 5, and below World 6, World Castle, and World Bowser. The world contains seven standard courses, a Captain Toad course, a Sprixie House, a Castle, and a Boss Arena. After the player has beaten Pom Pom, the blue Sprixie Princess will create a Clear Pipe to World 3-B, and clearing that level unlocks World 4.