World 4 is the fourth world contained in Super Mario 3D Land. This world is a pale green meadow with small, medium and large mushrooms. World 4 contains six levels and a Mystery Box. It is also the first encounter with Pom Pom, the boss of this World.
Levels
| Level | Preview | Description |
|---|---|---|
| World 4-1 | 
|
This is the first forest level of the game. |
| World 4-2 | 
|
This is an underground level with colored walls and ground. |
| World 4-3 | 
|
This course takes place in the sky, with colored spinning blocks and checkered grass platforms. |
| World 4-4 | 
|
The first Ghost House in the game. |
| World 4-5 | 
|
This level is notable for having many green flipping panels. |
World 4- Airship
|
|
This course introduces Pom Pom. |
Mystery Box
The 2 possible contents of this world's Mystery Box are:
- Two Tail Goombas and a Piranha Plant. Defeating the enemies causes 15 Coins and a Star Medal to appear.
- 10 Crates, 4 of which contain 1-Up Mushrooms, two Question Blocks containing a Super Leaf and a Fire Flower respectively, and two Star Medals.