As you earn Stars in the Games, you'll unlock new Items in the Gallery Corner. Here's what you get depending on how many Stars you get.

Item	How to unlock
Gallery Corner, Note Board	You Start with these.
Gift, Classic Ball	Earn 15 Stars.
Modern Ball - Bowser Version (K is for Kuppa or Koopa, Bowser's Japanese name)	Earn 100 Stars.
Modern Ball - Mario Version (Press Up to switch between Versions)	Earn 35 Stars.
Modern Ball - Wario Version	Earn 45 Stars.
Modern Ball - Yoshi Version	Earn 25 Stars.
Museum Entry - 051: Oil Panic	Earn 20 Stars.
Museum Entry - 054: Green House	Earn 30 Stars.
Museum Entry - 057: Rain Shower	Earn 70 Stars.
Museum Entry - 058: Life Boat	Earn 40 Stars.
Museum Entry - 104: Tropical Fish	Earn 60 Stars.
Museum Entry - 201: Spitball Sparky	Earn 80 Stars.
Museum, Museum Entry - 052: Donkey Kong	Earn 10 Stars.
Music Room	Earn 5 Stars.
View Cast Credits (Get 1,000 Points in any game to view again)	Earn 120 Stars.
View Staff Credits, Museum Entry - 101: Donkey Kong Jr.	Earn 50 Stars.