World 2 (New Super Mario Bros. Wii)

Sea of Sand 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 dieing.

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

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.