Super Mario Galaxy 6

Super Mario Galaxy 6 is a game in the Super Mario Galaxy series. It is very similar to SMG2 in terms of gameplay, and has returning features such as Comet Medals and Green Stars. The game features a wider variety of power ups than ever before, with some powers returning from Super Mario Galaxy, SMG2, and even some new powers as well. Just like SMG2, there will be Worlds instead of Domes and just like in SMG2 they will be accessed via a spaceship, this one being called The Great Ship.

Galaxies
Each World has 5 galaxies, containing 3 stars each. There are 8 worlds in total, adding up to 120 stars. After finding all the Stars, 3 new Green Stars will appear in each galaxy, making a total of 240. Once all the Stars in one world, yellow and green, have been collected, a galaxy in World 9 will unlock. World 9 galaxies each only have 2 stars, and once a Yellow Stars are found there, 2 Green Stars will appear in each. Upon finding all World 9 Stars, a final galaxy will open in World 9 with 6 stars in it. Upon collecting all other 270 stars, the final galaxy will open up, located from a Warp Pad on The Great Ship. This galaxy only contains 2 stars. That said, there are a total of 272 stars in this game, 30 more than Super Mario Galaxy or SMG2.

World 1

 * Bonzai Blast Galaxy (0 stars)
 * Big Egg Galaxy (1 star)
 * Mecha Tech Galaxy (2 stars)
 * Flower Power Galaxy (3 stars; 400 star bits)
 * Bowser Jr.'s Electric Engine (5 stars, 1 from Mecha Tech)

World 2

 * Murky Waters Galaxy (6 stars, 1 Grand Star)
 * Acid Rain Galaxy (7 stars)
 * Crash Ruins Galaxy (8 stars)
 * Swap Bop Galaxy (9 stars; 700 star bits)
 * Bowser's Battleship Brigade (13 stars; 1 from Crash Ruins)