Acorn Plains
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Acorn Plains is the first world in New Super Mario Bros. U, New Super Luigi U, and New Super Mario Bros. U Deluxe. It lies south of Layer-Cake Desert, west to Sparkling Waters, Soda Jungle and Rock-Candy Mines, and southwest of Frosted Glacier, Meringue Clouds and Peach's Castle. It is a plains world with acorn trees, teal hills, shrubs, viridian 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, a Castle, 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 | 
|
An underground level with tilted pipes and moving crystals. |
Acorn Plains- Tower
|
Crushing-Cogs Tower | 
|
The first Tower course of the game with shifting platforms and several spinning cogs. Boom Boom is fought here at the end. |
| Acorn Plains-3 | Yoshi Hill | 
|
It introduces Green Yoshi and Monty Moles. |
| Acorn Plains-4 | Mushroom Heights | 
|
It is an athletic level with many mushroom platforms and Piranha Plants. |
| Acorn Plains-5 | Rise of the Piranha Plants | 
|
This level features slanted grounds, Big Piranha Plants, and Hammer Bros. |
Acorn Plains- Castle
|
Lemmy's Swingback Castle | 
|
A castle filled with lava, swinging platforms held by chains, and Lava Bubbles. Lemmy Koopa is fought here in his airship. |
Acorn Plains- Blooper
|
Blooper's Secret Lair | 
|
A secret underwater level which can be unlocked by finding the secret exit in Tilted Tunnel. This level introduces Bloopers and unlocks a path to Soda Jungle. |
New Super Luigi U
| Level Number | Level Name | Preview | Description |
|---|---|---|---|
| Acorn Plains-1 | Waddlewing Warning! | 
|
A course with many Waddlewings, Super Acorns, and moving hills. |
| Acorn Plains-2 | Crooked Cavern | 
|
An underground course with many shifting crystal platforms and Piranha Plants. It contains a secret exit. |
| Acorn Plains-Tower
|
Flame-Gear Tower | 
|
A tower course with gears and Burners. Boom Boom is fought here at the end. |
| Acorn Plains-3 | Rolling Yoshi Hills | 
|
A course with fast-moving rolling hills and Yoshis. |
| Acorn Plains-4 | Piranha Heights | 
|
A sky course with many Piranha Plants. |
| Acorn Plains-5 | Piranha Gardens | 
|
A grassy course with hedges, one of which is Luigi-shaped, and Big Piranha Plants. |
| Acorn Plains-Castle
|
Lemmy's Lights-Out Castle | 
|
A dark castle with Munchers and swinging platforms. Lemmy Koopa is fought here in his airship. |
Acorn Plains- Cheep Cheep
|
Cheep Chomp Chase | 
|
An underwater course in which Luigi must evade a Cheep Chomp and huge groups of Cheep Cheeps. This level unlocks a path to Soda Jungle. |
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
- When Waddlewings Attack - Boost Mode Challenges (Original Course)
- The Perpetual Shell - Boost Mode Challenges (Original Course)
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
- Fire Piranha Plants
- Big Piranha Plants
- Goombrats
- Hammer Bros.
- Lava Bubbles
- Bloopers
- Blooper Nannies
- Blooper Babies
- Boss: Boom Boom
- Boss: Lemmy Koopa
New Super Luigi U
- Koopa Troopas
- Waddlewings
- Piranha Plants
- Dry Bones
- Monty Moles
- Hammer Bros.
- Big Piranha Plants
- Rocket Engines
- Munchers
- Cheep Chomps
- Cheep Cheeps
- Deep Cheeps
- Big Deep Cheeps
- Eep Cheeps
- Big Eep Cheeps
- Boss: Boom Boom
- Boss: Lemmy Koopa
Level maps
New Super Mario Bros. U
Acorn Plains Way
Tilted Tunnel
Crushing-Cogs Tower
Yoshi Hill
Mushroom Heights
Rise of the Piranha Plants
Lemmy's Swingback Castle
Blooper's Secret Lair
New Super Luigi U
Waddlewing Warning!
Crooked Cavern
Flame-Gear Tower
Rolling Yoshi Hills
Piranha Heights
Piranha Gardens
Lemmy's Lights-Out Castle
Cheep Chomp Chase
Appearances in other games
Mario Golf: World Tour
Acorn Plains briefly appears in Mario Golf: World Tour as part of Nabbit's victory animation. He traverses through a modified version of Acorn Plains Way, until he reaches the top to jump high in the sky.
Super Smash Bros. series
Acorn Plains appears in Super Smash Bros. for Wii U and Super Smash Bros. Ultimate as a part of the transforming stage Mushroom Kingdom U as the starting area. The Acorn Plains section of this stage features grassy platforms of different heights. Occasionally, Stretch Blocks and giant icicles appear.
Super Mario Maker / Super Mario Maker 2
In Super Mario Maker and Super Mario Maker 2, courses with the overworld theme of the New Super Mario Bros. U style are set in Acorn Plains.
Super Mario Run
The levels Up and Over, Shell Me the Way!, Slope to Success, and Piranha Plant Field from Super Mario Run, as well as the game's prologue, take place in Acorn Plains.
Monopoly Gamer
Acorn Plains is the first property on the game board in Monopoly Gamer. It is one of two properties in the Brown Color Set (along with Yoshi's Hill).
Names in other languages
| Language | Name | Meaning | Notes |
|---|---|---|---|
| Japanese | ドングリへいげん[?] Donguri heigen |
Acorn Plains | |
| Chinese | 橡栗平原[?] Xiànglì Píngyuán |
Acorn Plains | |
| Dutch | Eikenvallei[?] | Oak Valley | |
| German | Eichenhain[?] | Oaks Grove | |
| Italian | Piana delle ghiande[?] | Acorn Plains | |
| Korean | 도토리 평원[?] Dotori Pyeongwon |
Acorn Plain | |
| Portuguese (NOA) | Planície das Nozes[?] | Nuts Plains | |
| Portuguese (NOE) | Planície das Bolotas[?] | Acorn Plains | |
| Russian | Долина желудей[?] Dolina zheludey |
Acorn Valley | |
| Spanish (NOA) | Pradera Bellotera[?] | Acorn Prairie | |
| Spanish (NOE) | Dehesa Bellotera[?] | Acorn Pasture |
Trivia
- In the premade world in the Super Mario Mash-Up Pack of Minecraft, a grassland resembling Acorn Plains appears.
