World 3 (New Super Mario Bros. Wii)

World 3 of New Super Mario Bros. Wii is an ice-themed world conquered by Lemmy Koopa. The Penguin Suit is introduced in this world. This is also the first world in the game that has a switch that can change the obstacles slightly in levels, similar to Switch Palaces. On the map is an area with ice that has two Ice Bros. on it. If Mario and the gang are hit by them, they will endure a battle game where they will have to complete the Enemy Course.

3-1 Cooligan Ice Slope
This area is infested with cooligan s.The first part is pretty simple, but the second part isn't.

3-2 Snowy Bullet Bills
This is a snow level that is infested with Bullet Bill s.

Enemy Course

 * Two Ice Bros.
 * Three Ice Bros.
 * Four Ice Bros.

The Ice Bros. will throw ice balls that will freeze and damage Mario and crew. To quickly escape an ice entrapment, simply shake the Wii remote.

3-3 Cold Crevice
This is an icy cave level wit 3 parts there are falling icicles, giant falling icicles that you can walk on, and some annoying enemies like Swooper s.

World 3 Ghost House
This is the first Ghost House in the game, Big Boos, little boos, and possessed furniture are the main obstacles in this level.

World 3 Tower
A portion of this level resembles Castle Crush, A level found in World 6 of Donkey Kong Country 2.

3-4 Ice Block Bananza
When you first do this level you can only get to the secret red flag way out that takes you to 3-5, when you get the switch after 3-5,all the red blocks will appear letting you beat the level the regular way.

3-5 Freezing Fungus
when you do this the first time you can only get to 1 of the 2 endings, but when you use the switch, red blocks will appear and you can get the hidden ending, unlocking a starman house.

World 3 Castle
Lemmy's Castle is riddled with giant falling icicles and frozen floors making timed jumps difficult, there are also some segments with bottomless cliffs which are traversed by a moving raft similar to the ones seen in Roy Koopa and Larry Koopa's castles in Super Mario World however this one is frozen.