There are no "hidden" levels, all you have to do to unlock the yellow and blue ??? galaxies is to get certain stars within that galaxy set. i.e, in the terrace, you have to beat the Dino-Piranah to unlock a ??? galaxy. That's just an example.
“You have enemies? Good. That means you've stood up for something, sometime in your life.” -Winston Churchill
Spoiler Alert!Wii Games I own, in order of getting:
- Wii Sports
- Legend of Zelda: Twilight Princess
- Call of Duty 3
- Super Mario Galaxy
- Medal of Honour: Heroes 2
- Trauma Centre: New Blood
- Mario Party 8
I beat the game. But have 60 stars to go. lol.