World 1 (New Super Mario Bros. Wii)

The First World in the New Super Mario Bros. Wii released for the Nintendo Wii console. This world is called Mushroom Plains. It consists of six levels, as well as the Fortress and Castle which the boss, Larry Koopa(AKA Cheatsy Koopa). There are also special stages that are the Mushroom Houses. There are only three of them in the Mushroom Plains(2 reds, 1 gold and no green). It is revealed that Peach's Castle is also located here, seen and hint cutscenes.

Levels

 * World 1-1

Difficulty rate:  1 / 10 Unlocks:     World 1-2 Secret Exit: No


 * World 1-2

Difficulty rate:  1 / 10 Unlocks:     World 1-3, Red Mushroom House Secret Exit: No


 * World 1-3

Difficulty rate:  2 / 10 Unlocks:     World 1-Fortress, Gold Mushroom House Secret Exit: Yes


 * World 1-Fortress

Difficulty rate:  2 / 10 Unlocks:     World 1-4 Secret Exit: No

Difficulty rate:  2 / 10 Unlocks:     Enemy Area, World 1-5, World 1-6, Red Mushroom House Secret Exit: No
 * World 1-4

Difficulty rate:  1 / 10 Unlocks:     3 Mushrooms Secret Exit: No
 * World 1-T

Difficutly:  2 / 10 Unlocks:     World 1-Castle Secret Exit: No
 * World 1-5

Difficulty:  1 / 10 Unlocks:     World 1-Castle Secret Exit: No
 * World 1-6

Difficulty:  2 / 10 Unlocks:     World 2-1 Secret Exit: No
 * World 1-C