Mini-Mega Island, or World B, is the second secret world in Newer Super Mario Bros. Wii. it is a grassy island with a "big and small" theme. It is unlocked by completing the secret exit in Pillar Pass in world 2. Completing the fortress will unlock a shortcut to Bubble Basin in world 3. This world's name is related to Super Mario 64's Tiny-Huge Island
The first level has the World 5 background from New Super Mario Bros Wii, and the rest of the levels have the background of world 1 in nsmbw.
B-1: Mighty Meadow
B-2: Pintsized Plains
B-3: Troopashell Track
B-4: Cheepcheep Creek
B-Fortress: Formidable Fortress
- The music in the normal levels are a remix of the theme for World 1 from New Super Mario Bros. Wii. In fact most of this world has the background of world 1.
Other buildings in Mini-Mega Island:
- The Minimega Music House is the official Music House for World B. It can be accessed through completing B-2.