World 1 (New Super Mario Bros. Wii)

World 1 is the first world in New Super Mario Bros. Wii, containing six levels, a fortress, a castle and a boss, three special stages - accessible by entering the Mushroom Houses - as well as housing Princess Peach's Castle. There are three special stages, two Red Toad Houses, and one Gold Toad House; the two Red Toad Houses occurring upon completion of World's 1-2 and 1-4, and the Gold Mushroom House occurring upon the completion of World 1-3.

Levels

Note: italics are secret exits.

Level	Unlocks	Preview	Description
1-1	World 1-2		The first level of New Super Mario Bros. Wii. It introduces the Propeller Suit, Goombas and Koopa Troopas. This level is designed for new players.
1-2	World 1-3, Red Mushroom House		This is the first underground level. This is also the first level with the Ice Flower power-up.
1-3	World 1-Fortress, Gold Mushroom House, 1-Cannon		This level is the first level to feature Yoshi, and has another secret exit, which is found by moving to the top of the fields and enter through the pipe.
1-Cannon	World 5-1	N/A	The Warp Cannon of World 1, leading directly to World 5. It is unlocked by finding the secret exit of the above level.
1-Tower	World 1-4		This is a tower level, featuring swinging platforms and moving stone blocks. Larry Koopa is the boss here.
1-4	Enemy Area, World 1-5, World 1-6, Red Mushroom House		This is an underwater level, featuring Cheep Cheeps.
1-5	World 1-Castle		This is first athletic level of New Super Mario Bros. Wii, containing regular and screw-controlled mushrooms, as well as spinning blocks.
1-6	World 1-Castle		A grassland level containing many rolling hills. Koopa Troopas and Koopa Paratroopas are the main enemies.
1-Castle	World 2-1, World 2-2		The first castle level of New Super Mario Bros. Wii. It contains lava pools, Thwomps, and giant spinning gears. Larry Koopa is the boss here again.

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