Soda Jungle

Soda Jungle is originally 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 6 normal levels, there are the Fortress and Castle. The boss of this world is Iggy Koopa. The next world that comes is originally Sparkling Waters, but if the player chooses the other way, it would be 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.