The easiest of them all. The basic enemies appear: Koopas, Shy Guys and Goombas. The boss is Bowser.
The world is set in the Desert owned by Toad. The level features Spineys, Pokeys, Desert Gnomes and Piranha Plants The Boss is Zombie Toad.
This world has piantas helping Mario. Enemies like Pukka Plants appear. Bowser Jr. (dressed as a pianta) is the boss.
The world is set in the skies of the Mushroom Kingdom. Foos can block your sight while Lakitus throw spiked sheels at you. Mega Lakitu is the boss
The level is quite easier than Sky Lane. Cheep Cheeps, Bloopers and Water Koopas make their appearance. Water Bowser is the boss.
BOO! Time to face your fears of ghosts. Boos and Peepas appear as well as the normal Koopas and Goombas. King Boo is the boss of the level.
Bowser Jr's Airship
Dry Bones, Thwomps, Whomps,Tanooki Bullet Bills, Bullet Bills, Banzai Bills and a few King Bills appear. Tanooki Banzai Bill is the boss of the level.
Bowser's Island 1
This is set on a Mountain to the top of the volcano. Lava Bubbles and Magmaarghs make their appearance. The boss is Dry Bowser and Kamek
Bowser's Island 2
The second part to Bowser's Island 1. Unlockable by defeating Dry Bowser and Kamek. The Island is set on the volcano and near the end, an acid lake. The boss is Bowser, then once "defeating" him the first time, Mega Bowser.
Originally called Peach's Palace, but changed to Mushroom Castle. The enemies from Mushroom Kingdom to Sky Lane appear in the levels. Boom Boom is the boss.
Rosalyn's Ice Palace
This level features two new enemies. Freezies and Ice-Moles. The boss is Pon Pon.
Daisy appears to assist in a few levels, along with two Toads and Birdo. The level has Piranha Sarasa Plants and Snifits are the enemies. The bosses of the level is the Koopalings. 1 after each level except the first 3.