Game & Watch Gallery 2 Cheats

You can unlock other characters aside from Yoshi to play as in the Ball modern version game by collecting a certain number of Stars.
Bowser:
Obtain 100 Stars
Mario:
Obtain 35 Stars
Wario:
Obtain 45 Stars

Obtain the indicated amount of Stars to unlock the corresponding Museum Title.
Unlock Donkey Kong:
Obtain 10 Stars
Unlock Donkey Kong Junior:
Obtain 50 Stars
Unlock Green House:
Obtain 30 Stars
Unlock Life Boat:
Obtain 40 Stars
Unlock Oil Panic:
Obtain 20 Stars
Unlock Rain Shower:
Obtain 70 Stars
Unlock Spitball Sparky:
Obtain 80 Stars
Unlock Tropical Fish:
Obtain 60 Stars

Start by playing Helmet on the easy difficulty setting and then lose ALL of your lives straight away. Then when you hit 'Retry' you will play as Wario instead of Mario.

At the 'Main' menu press Up, Up, Down, Down, Left, Left, Right, Right to reset the cartridge memory.

Earn the indicated number of Stars as you play through the game to unlock the corresponding items in the Gallery Corner.
Unlock Music Room:
Earn 5 Stars
Unlock Museum, Museum Entry – 052: Donkey Kong:
Earn 10 Stars
Unlock Gift, Classic Ball:
Earn 15 Stars
Unlock Museum Entry – 051: Oil Panic:
Earn 20 Stars
Unlock Modern Ball – Yoshi Version:
Earn 25 Stars
Unlock Museum Entry – 054: Green House:
Earn 30 Stars
Unlock Modern Ball – Mario Version (Press Up to switch between Versions):
Earn 35 Stars
Unlock Museum Entry – 058: Life Boat:
Earn 40 Stars
Unlock Modern Ball – Wario Version:
Earn 45 Stars
Unlock View Staff Credits, Museum Entry – 101: Donkey Kong Jr:
Earn 50 Stars
Unlock Museum Entry – 104: Tropical Fish:
Earn 60 Stars
Unlock Museum Entry – 057: Rain Shower:
Earn 70 Stars
Unlock Museum Entry – 201: Spitball Sparky:
Earn 80 Stars
Unlock Modern Ball – Bowser Version (K is for Kuppa or Koopa, Bowser’s Japanese name):
Earn 100 Stars
Unlock View Cast Credits (Get 1,000 Points in any game to view again):
Earn 120 Stars