Super Mario Galaxy.....all I have to say is WHAT AN AMAZING GAME. It was so much fun. The best Mario game up to date! The ending was awesome! It made my wife cry when she saw it. I just finished getting the 120th star last night. To be honest, I wasn't really expecting much from obtaining the last star. Maybe a new galaxy with only 3 or 4 new stages. Or even the option to play around Peach's Castle and explore around there. But, then after I saw the credits the second time, not only was there an extended ending I also hear this--> Super Luigi Galaxy! At first I thought, "Ok, that's pretty cool to play as Luigi. Maybe you get to use him in the "new world" Rosalina was talking about." Nope! Come to find out you travel all the galaxies that mario did while collecting yet another set of 120 stars!
Seems like Nintendo might be hiding something within Galaxy seeing as they want you to collect 240 stars instead of 120. Luigi runs faster and jumps a hell of a lot higher. Looks like I will have more nights without sleep. This is will continue to be fun!!