Soda Jungle

Soda Jungle is the forest world in New Super Mario Bros. U. It can be reached by completing Wendy’s Shifting Castle and going south, or by completing the Sparkling Waters castle and going north. This world, as the name implies, takes place in a jungle that's inspired by Big Island from Super Mario Bros. 3, Forest of Illusion from Super Mario World and World 5 from New Super Mario Bros. Wii in terms of appearance, layout and theme as the jungle is giant-themed within both the world map and the normal levels, which there are 5 of in this world, as well as giant versions of enemies, like Grand Goombas and Gargantua Koopa Troopas. It's been said that there'll be either seven or eight levels in this world, but so far there are 5 normal levels, as well as the Fortress and Castle levels. If the total amount is 8, then the eighth is possibly a Ghost House or another standard level.

The boss of this world is Iggy Koopa, who ironically is the boss of both the fifth world in the game (like he was the boss of World 5 in the Wii prequel) and a big themed world (much like how he was the boss of Big Island). The fourth level's background in this world is inspired by Vincent van Gogh's art style, mainly his The Starry Night painting.

Interestingly, every world (counting this one) in New Super Mario Bros. U that has been confirmed has a pipe at the beginning of the world.

Levels

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