World 6 (New Super Mario Bros. Wii)

The Rocky Mountain is the name of a mountainous area in New Super Mario Bros. Wii. This world region features many cliffs and rock structures. There are eight levels in this world, two of them being castle levels that are guarded by Morton Koopa Jr.. Various Mushroom Houses are also found around here, giving the player items such as Starmen, Mushrooms, and Propeller Mushrooms. On the map, there are Bullet Bill Blasters which continuously fire Bullet Bills. Mario and the gang can get attacked by them and be forced to play in the Enemy Course.

6-1 (Spike Mountain)
This level is pretty tough. There are ledges, rock climbing walls, Stone Spikes, and Bullet Bills here.

6-2 Mountain Donuts
This is an underground level, with many rotating circular platfroms in it. Piranha Plants, Swoopers, Spinies and, at the end of the stage, Sledge Bro.s appear. This level also has some watery sections.

6-3 Mountain Sewers
In this level, there are Mega Piranha Plants, Stalking Piranha Plants, and Buzzy Beetles. The level is an underground area with raising and lowering platforms which the Mega Piranha Plants are on top of. When the player sees a passageway that is blocked by brick blocks, he/she can break them and wall jump to get a Star Coin.

Enemy Course

 * Infinite Bullet Bills

6-Fortress
This tower contains two giant spiked pillars that the player needs to watch out for. There are also some pipe cannons and moving platforms that the player will have to use to advance.

The player faces Morton Koopa Jr. at the very top. During the fight, the player needs to be aware of two spiked pillars that'll strike the sides of the arena.

6-6
This level takes place in a dark underground cavern. There's a boat with a light that the player can move by rotating the Wii Remote. Various enemies, such as Piranha Plants, Cheep-Cheeps, Swoopers, and Fire Bros., make an appearance here.

A secret exit exists in this level, which can be found by entering a red pipe in the area infested with Fire Bros.. The player will be in an area with a glow block, along with a Swooper swarm. After that area is the secret flagpole. The warp cannon takes the player to World 8.

6-Castle
In this level, there are Spiked Balls and Mega Spiked Balls that can hurt the player. Of course, they can also destroy the Dry Bones. It is set above a pool of lava with moving platforms. The castle features two areas, with the second area being highly infested with Spiked Balls.

The player faces Morton Koopa Jr. again in this castle. At times he'll pound the ground, which will cause two pillars to rise between him.

6-Ship
This level has the first appearance of Rocky Wrenches and the Hero Car. This is also where the player fights Bowser Jr. for the second time. Other dangers in this level are a series of wheels, which the player needs to jump on to advance. In Bowser Jr.'s fight, the player must climb into his/her own clown copter and knock Bowser Jr.'s Copter into the electric fence.

Enemies Introduced

 * Stone Spikes
 * Monty Moles
 * Rocky Wrenches