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I've finished Super Mario Galaxy 2. At least, I though I had. It appears there is a mysterious, unnamed final galaxy in world S. How do I unlock and get to this galaxy?

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up vote 6 down vote accepted

The absolutely last galaxy in World S is the Grandmaster Galaxy.

You have to collect all 120 Power Stars and 120 Green Stars to unlock it.

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Holy cow. Seriously? – splattered bits Nov 9 '11 at 19:58
Yes, it really is the last level of the game and needs everything else done before you get to it. Here's a random wiki I've turned up on a quick search that should help confirm what I've said (just don't scroll down or click thru too much if you don't want spoilers) – DMA57361 Nov 9 '11 at 20:02

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