World 1 (New Super Mario Bros. Wii)

World 1 (also known as Princess Peach’s Kingdom ) is the first world in New Super Mario Bros. Wii. World 1 is occupied by Larry Koopa, the first boss to be fought in the game. This world features typical grassy plains with many colorful mushroom hills, similar to New Super Mario Bros. It has eight levels, three Toad Houses, and a cannon. Of the three Toad Houses, two are red and one is yellow. It also has a total of nine exits. This world is also home of Peach's Castle. The Enemy Course features Goombas in three different sizes.

New enemies

 * Goombas
 * Hefty Goombas
 * Big Goombas
 * Koopa Troopas
 * Koopa Paratroopas
 * Piranha Plants
 * Venus Fire Traps
 * Hammer Bros.
 * Dry Bones
 * Urchins
 * Cheep Cheeps
 * Mega Cheep-Cheeps
 * Spiny Cheep Cheeps
 * Deep-Cheeps
 * Mega Deep-Cheeps
 * Eep Cheeps
 * Clampys
 * Thwomps
 * Big Thwomps
 * Larry Koopa (Boss)