World 4 is the fourth world contained in Super Mario 3D Land. This world takes place in a lime-green grassland with mushrooms of varying sizes bouncing up and down in the background. 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 | 
|
A forest level with a giant tree at the end. |
| World 4-2 | 
|
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. Requires 30 Star Medals to be unlocked. |
| World 4-4 | 
|
The first Ghost House in the game, with platforms that suddenly appear when Mario moves towards them. |
| World 4-5 | 
|
A stage with a heavy emphasis on Flip Panels. |
World 4- Airship
|
|
An Airship course with Red-Blue Panels. The boss is Pom Pom. |
Mystery Box
The two 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.
- Ten Crates, four of which contain 1-Up Mushrooms, two ? Blocks containing a Super Leaf and a Fire Flower respectively, and two Star Medals.