Soda Jungle

Soda Jungle is officialy the fourth world in New Super Mario Bros. U. But if the player takes the other way, then it's World 5 for the player. This world, as the name implies, takes place in a jungle that's inspired by Forest of Illusion and World 5 from New Super Mario Bros. Wii in terms of appearance and layout and Big Island from Super Mario Bros. 3 in the fact that the jungle is humongous on the world map and within the normal levels, which there are 5 of in this world, and giant versions of enemies, like Grand Goombas and Gargantua Koopa Troopas. Along with the 5 normal levels, there are the Fortress and Castle levels and the eighth level is possibly a Ghost House. The boss of this world is Iggy Koopa. The next world, again depending on the player's choice, will either be Sparkling Waters or the mountain world.

Levels

 * World 4-1: Jungle of the Giants
 * World 4-2: Bridge Over Poisoned Water
 * World 4-Fortress: Snake Block Tower
 * World 4-3: Bramble Jungle
 * World 4-4: Painted Swamp Land
 * World 4-5: Deepsea Ruins
 * World 4-Castle: Iggy’s Volcanic Castle

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.