New Super Mario Bros. Wii Cheats :
Secret - Mushroom Houses
In New SMB Wii, you can make a bonus Mushroom house appear on the map by saving Toad when he appears in a level. To do this, you'll need to head to a level with the white Toad marker. Release Toad from the ? Block he's trapped in -- near the beginning of a level, listen for the cries -- and run him all the way to the end of the level to make a Mushroom House spawn. The type of Mushroom house depends on the final digit of the time when you grab the flag at the end of the level.
Note: In multiplayer, you can make a Mushroom House appear using the a similar timing method. Hit the flag when the time digits end in 00,11,or 22 for a green house; 33, 44, 55, 66, 77 or 88 for a red house; or 99 for a gold house.
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