Frosted Glacier

Frosted Glacier is the snowy world in New Super Mario Bros. U, lying northeast of Layer Cake Desert, Sparkling Waters, and Acorn Plains and north of Soda Jungle. Frosted Glacier is a cold and snowy world with pine trees and small indigo mountains that takes place during a constellation filled night. It's one of two of the worlds that the player can choose from after beating Morton in Morton’s Compactor Castle, the other being Sparkling Waters. Because of this, it is quite possible to play through the game without ever reaching Frosted Glacier. There are 8 levels in this world, five of them are the regular levels, two are the Fortress and Castle levels and one is the first Ghost House in the game. The boss of this world is Wendy O. Koopa. The Bubble Baby Yoshi is making an appearance in the first level of this world. There are Cooligan Enemy Courses, as they seem to slide into a pipe near the second level.

Levels

 * Spinning Star Sky: The first level of Frosted Glacier includes giant stars that move when the player steps on it.
 * Cooligan Fields: The second level of Frosted Glacier. It introduces Cooligans and possibly introduces Bubble Baby Yoshis.
 * Fortress Freezing Rain Tower: The fortress level of Frosted Glacier.
 * Prickly Goombas: The third level of Frosted Glacier.
 * Scaling the Mountainside: The fourth level of Frosted Glacier.
 * Icicle Caverns: The fifth level of Frosted Glacier.
 * Swinging Ghost House: The Ghost House of Frosted Glacier.
 * Wendy’s Shifting Castle: The Castle level of Frosted Glacier with moving girders and Thwomps.

Trivia

 * Every world (counting this one) in New Super Mario Bros. U that is confirmed and is showed, has a pipe at the beginning of the world.
 * This is one of the few worlds in the Mario series to take during night.