|Game(s)||Newer Super Mario Bros. Wii|
Newer Super Mario Bros. Wii Plus
Morton Koopa Jr.
|Previous world||(2) Rubble Ruins/Soggy Sewers|
(B) Mini-Mega Island (secret)
|Next world||(4) Sakura Village|
Mushroom Peaks is the third World in Newer Super Mario Bros. Wii and Newer Super Mario Bros. Wii Plus which lies north of Rubble Ruins. The Tower/Castle Boss is Ricky Wrench and the Airship Boss is Morton Koopa Jr.
Mushroom Peaks is a mountainous area. The mountains extend so far it overlaps part of Sakura Village and Rubble Ruins's Fossil Tunnel. Its mountainous setting is also used in Sky Mountain, but with some changes. Mushroom Peaks has brown dirt-like ground, and it's filled with mushrooms.
|Level number||Level name||Preview||Description|
|3-1||Chomproller Heights||It features lots of Chain Chomps, Goombas, and Hammer Bros. It also introduces the Hammer Suit.|
|3-2||Grimymole Mine||It features many Monty Moles and Expanding Mushroom Platforms.|
|3-3||Butterwood Crossing||This level is located on a bridge filled with Fuzzies. This level also has a lot of ! Blocks throughout the level that change some track's directions.|
|3-4||Wobbleshroom Bluffs||The level features multiple Mushroom Blocks and Mushroom Platforms, most of which are moving.|
|3-||Burnblaze Tower||A tower with many fiery obstacles and moving platforms where Ricky Wrench is fought.|
|3-||Moltenwire Castle||An autoscrolling castle level with many Fire Bars, where Ricky Wrench is finally fought.|
|3-||Capshroom Airship||An airship with lots of Screw Mushrooms where Morton Koopa Jr. is fought.|
- The music in some of this world's levels are remixes of the theme for World 6 Map from New Super Mario Bros. Wii.
Other buildings in Mushroom Peaks:
- Mountain Mall, the shop that can be accessed after completing 3-3 (Butterwood Crossing)'s secret exit.
The bosses for Mushroom Peak.
- 3-T: In Burnblaze Tower, you fight Ricky Wrench for the first time.
- 3-C: In Moltenwire Castle, you fight Ricky Wrench for the final time.
- 3-A: In Capshroom Airship, you fight Morton Koopa Jr., one of the Koopalings.