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.

Characters	Protagonists	Mario • Luigi • Princess Peach
	Antagonists	Bowser • Bowser Jr. • Koopalings • Kamek
	Supporting Characters	Princess Peach • Yoshi • Toad
Worlds	World 1	World 1-1 • World 1-2 • World 1-3 • World 1- • World 1- • World 1-4 • World 1-5 • World 1-6 • World 1-
	World 2	World 2-1 • World 2-2 • World 2-3 • World 2- • World 2-4 • World 2-5 • World 2-6 • World 2-
	World 3	World 3-1 • World 3-2 • World 3-3 • World 3- • World 3- • World 3- • World 3-4 • World 3-5 • World 3-
	World 4	World 4-1 • World 4-2 • World 4-3 • World 4- • World 4- • World 4-4 • World 4- • World 4-5 • World 4- • World 4-
	World 5	World 5-1 • World 5-2 • World 5-3 • World 5- • World 5-4 • World 5- • World 5- • World 5-5 • World 5-
	World 6	World 6-1 • World 6-2 • World 6-3 • World 6-4 • World 6- • World 6-5 • World 6-6 • World 6- • World 6- • World 6- • World 6-
	World 7	World 7-1 • World 7-2 • World 7-3 • World 7- • World 7- World 7-4 • World 7-5 • World 7-6 • World 7-
	World 8	World 8-1 • World 8-2 • World 8-3 • World 8- • World 8-4 • World 8-5 • World 8-6 • World 8-7 • World 8- • World 8-
	World 9	World 9-1 • World 9-2 • World 9-3 • World 9-4 • World 9-5 • World 9-6 • World 9-7 • World 9-8
	Coin Courses	World Coin-1 • World Coin-2 • World Coin-3 • World Coin-4 • World Coin-5
Enemies	Enemies	Amp • Banzai Bill • Banzai Bill Cannon • Big Boo • Big Cheep Cheep • Big Deep Cheep • Big Dry Bones • Big Fire Piranha Plant • Big Fuzzy • Big Goomba • Big Piranha Plant • Big Thwomp • Big Wiggler • Big Urchin • Bill Blaster • Bill Blaster Turret • Blooper • Blooper Baby • Blooper Nanny • Bob-omb • Boo • Boomerang Bro • Bramball • Broozer • Bulber • Bull's-Eye Bill • Bullet Bill • Buzzy Beetle • Cannonball • Chain Chomp • Cheep Cheep • Cheep Chomp • Circling Boo Buddies • Clampy • Climbing Koopa • Cooligan • Crowber • Deep Cheep • Dry Bones • Eep Cheep • Fire Bro • Fire Piranha Plant • Fire Snake • Fish Bone • Flame Chomp • Foo • Fuzzy • Ghost Vase • Giant Cannonball • Goomba • Hammer Bro • Heavy Para-Beetle • Huckit Crab • Ice Bro • Jellybeam • King Bill • King Bill (New Super Mario Bros. Wii) • Koopa Paratroopa • Koopa Troopa • Lakitu • Lava Bubble • Mechakoopa • Mega Goomba • Micro Goomba • Monty Mole • Muncher • Parabomb • Para-Beetle • Paragoomba • Piranha Plant • Pokey • Porcupuffer • River Piranha Plant • Rocky Wrench • Scaredy Rat • Sledge Bro • Spike • Spike Top • Spiny • Spiny Cheep Cheep • Stalking Piranha Plant • Stone Spike • Swoop • Thwomp • Urchin • Wiggler
	Obstacles	Burner • Fire Bar • Giant Spiked Ball • Icicle • Skewer • Spiked Ball • Spinner • Volcanic Debris • Volcanic Smoke
	Bosses	Bowser Jr. • Larry Koopa • Roy Koopa • Lemmy Koopa • Wendy O. Koopa • Iggy Koopa • Morton Koopa Jr. • Ludwig von Koopa • Kamek • Bowser
Items	Items	Super Mushroom • Mario Car • 1-Up Mushroom • Mini Mushroom • Propeller Mushroom • Fire Flower • Ice Flower • Penguin Suit • Star • Coin • Blue Coin • Red Coin • Red Ring • Hidden Coin • Star Coin • Trampoline • POW Block • Light Block • Propeller Block • Stretch Block • Roulette Block • P Switch • ? Switch • Red ! Switch • Square Cloud • Barrel • Toad Balloon • Berry • Checkpoint Flag