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World 2 (New Super Mario Bros. Wii) or World 2 (NSMBW), is the second world of New Super Mario Bros. Wii. The levels are all desert themed. There are eight levels in this world, two of them being castle levels that are guarded by Roy Koopa. Various Mushroom Houses are also found around here, giving the player items such as Starmans, Mushrooms, and Propeller Mushrooms. On the map, there is an area where Mario and the gang can get sucked into the sand and play in a level where they have to collect all the Toad Balloons without dying.
2-1 Sandrockets
This level takes place in a pit. In this level there are many gyser-like eruptions of sand jetting out of bottomless pits, which the player can stand on.
2-2 Spiky Desert
This level is filled with barrels and new enemies for the game called Spikes. These enemies attack by chucking spike balls at you. There are areas with elevators infested with koopas and spikes. If you go into a pipe by the elevators right after the halfway point, you can get a mini-mushroom that will let you go into the mini pipe and let you skip a lot of the level.
2-3 Cave of Fire
This level is a pitch dark cave, which is dimly lit by lanterns, Fire Bros. and fire- spitting Venus Fire Trap. The player must use a fire flower and shoot fireballs to improve visibility.
2-Fortress
2-4 Windswept Gulch
This level has many floating coins and Koopas, as well as POW Blocks. Every few seconds, wind blows in the level, forcing the player to the right.
2-5
This level has many Pokeys and there's also a Yoshi in this level which makes taking Pokeys down easy while following the beat of the music.
2-6
A Mushroom Level that mostly has moving coins and blocks. The player will have to ride a Pink Block for the majority of the course, but a propellerhead Suit is needed to access the secret Cannon of the Level.
Enemy Course
When 2-5 or 2-6 are beaten, 6 spots on the map will open, and every time the player moves onto one of the spots, 2 holes will shoot up. If he/she is on the platform when this happens, they will fall. There are also Spinies on the ceilings.
2-Castle
This castle is filled with lava pits, and three way corridors, of which only one is the correct path, much like in Super Mario Bros.: The Lost Levels. Roy Koopa is fought here for the second time.