World 4 (Super Mario 3D Land)

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.

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 Question Blocks containing a Super Leaf and a Fire Flower respectively, and two Star Medals.

New enemies

 * Thorny Flowers
 * Big Boos
 * Boomerang Bros.
 * Boos
 * Peepas
 * Tail Boos
 * Boss: Pom Pom