World 4 (Super Mario Galaxy 2)

World 4: The Many Mysteries of the Cosmos is the fourth world featured in Super Mario Galaxy 2. It is located near a galaxy, which could be the Grand Finale Galaxy. It holds seven galaxies, the last of which, Bowser's Gravity Gauntlet, features the second encounter with Giant Bowser, who attacks again in a small planet, now with new several moves.

Galaxies

 * Supermassive Galaxy
 * Flipsville Galaxy
 * Starshine Beach Galaxy
 * Chompworks Galaxy
 * Sweet Mystery Galaxy
 * Honeyhop Galaxy
 * Bowser's Gravity Gauntlet