Acorn Plains
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Acorn Plains is the grassy first world of New Super Mario Bros. U and New Super Luigi U. It lies south of Layer Cake Desert, west to Sparkling Waters, Soda Jungle and Rock-Candy Mines, and south-west of Frosted Glacier, Meringue Clouds and Peach's Castle. It is a plains world with acorn trees, blue-green hills, shrubs, jagged mountains reminiscent of some of the backgrounds in Super Mario World and the world's most defining feature, the Acorn Tree. This special tree is one of main sources of the game's new power-up, the Super Acorn. It can be found in the game's intro, Acorn Plains' map section and said world's first level. This world has eight levels, with 5 normal levels, a secret level, a Tower level and a Castle level, a red and green Toad House, a Piranha Plant Enemy Course, and a spot where a magenta Baby Yoshi walks near. The Castle boss of this world is Lemmy Koopa.
Levels
New Super Mario Bros. U
| Level Number | Level Name | Preview | Description |
|---|---|---|---|
| Acorn Plains-1 | Acorn Plains Way | 
|
A simple grassy level that introduces the Super Acorns and the Waddlewings. |
| Acorn Plains-2 | Tilted Tunnel | File:Nsmbu underground.png | An underground level with tilted pipes and moving crystals. |
| Acorn Plains-File:Fort Icon.png | Crushing-Cogs Tower | File:World1-TowerStarCoin2.jpg | The first Tower course of the game with shifting platforms and several spinning cogs. |
| Acorn Plains-3 | Yoshi Hill | 
|
It introduces Green Yoshi and Monty Moles. |
| Acorn Plains-4 | Mushroom Heights | File:NSMBUM&LMagentaYoshi.jpg | It is an athletic level and it introduces Balloon Baby Yoshi. |
| Acorn Plains-5 | Rise of the Piranha Plants | File:World1-5StarCoin3.jpg | This level features slanted grounds, Super Piranha Plants, and Hammer Bros.. |
Acorn Plains- Castle
|
Lemmy's Swingback Castle | File:Lemmy's Swingback Castle.PNG | A castle filled with lava, swinging platforms held by chains, and Lava Bubbles. |
Acorn Plains-
|
Blooper's Secret Lair | 
|
A secret underwater level which can be unlocked by finding the secret exit in Tilted Tunnel. This level introduces Bloopers. |
New Super Luigi U
| Level Number | Level Name | Preview | Description |
|---|---|---|---|
| Acorn Plains-1 | Waddlewing Warning! | File:NSLU Acorn Plains.png | A course with many Waddlewings, Super Acorns, and moving hills. |
| Acorn Plains-2 | Crooked Cavern | File:Acorn Plain 2 NSLU.PNG | An underground course with many shifting crystal platforms and Piranha Plants. |
| Acorn Plains-File:Fort Icon.png | Flame-Gear Tower | File:Flame-Gear Fortress.PNG | A tower course with gears and Rocket Engines. |
| Acorn Plains-3 | Rolling Yoshi Hills | File:WiiU LuigiU scrn08 E3.png | A course with fast-moving rolling hills and Yoshis. |
| Acorn Plains-4 | Piranha Heights | File:WiiU LuigiU scrn02 E3.png | A sky course with many Piranha Plants. |
| Acorn Plains-5 | Piranha Gardens | File:WiiU LuigiU scrn01 E3.png | A grassy course with Luigi-shaped hedges and Super Piranha Plants. |
| Acorn Plains-Castle
|
Lemmy's Lights-Out Castle | File:Light-out castle.PNG | A dark castle with Munchers and swinging platforms. |
| Acorn Plains-File:Cheep red.png | Cheep Chomp Chase | File:Cheep Chomp Chase.PNG | An underwater course in which Luigi must evade a Cheep-Chomp and huge groups of Cheep Cheeps. |
Challenge Mode Original Courses
- Acorn Plains Speed Run - Time Attack
- Castle Coin Bypass - Coin Collection
- Full Speed Ahead - Time Attack (Original Course)
- Graceful Glide - Special (Original Course)
- Hot-Air Yoshi Ride - Coin Collection (Original Course)
- Paratroopa Panic - 1-Up Rally (Original Course)
- Star Connection - 1-Up Rally (Original Course)
- Stingy Big Piranha Plants - Coin Collection
- The Goombrat Stomp - 1-Up Rally
- Time Attack Trial - Time Attack (Original Course)
- Triple-Jump for Coins - Coin Collection (Original Course)
- Waddlewing Wipeout - Coin Collection
Boost Rush Courses
- Acorn Plains Way – Easy Pack
- Mushroom Heights – Acrobat Pack
- Lemmy's Swingback Castle – Flying Squirrel Pack
- Yoshi Hill – Yoshi Pack
New Enemies
New Super Mario Bros. U
- Goombas
- Koopa Troopas
- Waddlewings
- Piranha Plants
- Buzzy Beetles
- Dry Bones
- Monty Moles
- Venus Fire Traps
- Super Piranha Plants
- Goombrats
- Hammer Bros.
- Podoboos
- Bloopers
- Blooper Nannies
- Baby Bloopers
- Boss: Boom Boom
- Boss: Lemmy Koopa
New Super Luigi U
- Koopa Troopas
- Waddlewings
- Piranha Plants
- Dry Bones
- Monty Moles
- Hammer Bros.
- Super Piranha Plants
- Rocket Engines
- Munchers
- Cheep-Chomps
- Cheep-Cheeps
- Deep-Cheeps
- Mega Deep-Cheeps
- Eep-Cheeps
- Mega Eep-Cheeps
- Boom Boom (Boss)
- Lemmy Koopa (Boss)
