World 2 (New Super Mario Bros. Wii)

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.

2-3
This level is a pitch dark cave, which is dimly lit by lanterns, Fire Bros. and fire- spitting Piranha Plants. The player must use a fire flower and shoot fireballs to improve visibility.

2-4
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.

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.