You may have noticed that I haven't been writing on here or The E Club World lately. That is because I was playing Super Mario Galaxy 2 for a very long time, and in fact, beat it! Here are some things that may help you in this game.
The Final Galaxy: Grandmaster!
How to get it: Get 240/242 Stars, Green Stars included, and the secret galaxy will open up in World S. This is unlike Super Mario Galaxy, where Grand Finale Galaxy, unlocked after all 120 Stars are collected, is the easiest galaxy in the game; Grandmaster Galaxy is the HARDEST galaxy in the game! (See videos below)