Cheats for Mario Superstar Baseball (GBC)

Secret Characters:
Not all players are unlocked from the start so you will need to unlock
them if you want to enjoy and experience all of the characters:

Baby Luigi - Complete Challenge Mode with Yoshi
Star Dash - Finish Star difficulty on all of the six mini-games
Dixie Kong - Finish challenge mode with Donkey Kong
Hammer Bro - Finish Challenge Mode with Bowser
Monty Mole - Finish Challenge Mode with Mario
Petey Piranha - Finish Challenge Mode with Wario
Toadette - Finish Challenge Mode with Peach

Unlock Koopa Castle Stadium:
Complete Challenge Mode one time.

Press A then R to do a fire ball.
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