World 1 (Super Mario Galaxy 4)

World 1: Mario's New Adventure Begins is the first World in Super Mario Galaxy 4 and is where Bowser Jr. releases the Mech-Ogre on Mario in his Mech-Factory.

Galaxies

 * Robotropolis Galaxy
 * Dino Jungle Galaxy
 * Dragon Dungeon Galaxy
 * Sky Brigade Galaxy
 * Power Panic Galaxy
 * Super Surf Galaxy
 * Bandit Boss Galaxy
 * Bowser Jr.'s Mecha-Factory