Mario Superstar Baseball

Play as Baby Luigi:
Successfully complete challenge mode as Yoshi.

Play as Dixie Kong:
Successfully complete challenge mode as Donkey Kong.

Play as Hammer Bro.:
Successfully complete challenge mode as Bowser.

Play as Monty Mole:
Successfully complete challenge mode as Mario.

Play as Petey Piranha:
Successfully complete challenge mode as Wario.

Play as Toadette:
Successfully complete challenge mode as Peach.

Play as Bowser:
Successfully complete challenge mode under the Special difficulty setting.

Koopa Castle stadium:
Successfully complete challenge mode.

Coin Derby mini game:
Successfully complete challenge mode.

Grand Prix mini-game:
Successfully complete all six mini-games under the Star difficulty setting.

Toy stadium mini-game:
Successfully complete all six mini-games, then spend 500 coins to buy the Secret Map from the shop. Use the Warp Pipe that appears to reach the Toy stadium mini-game.

Super Star:
Collect all items on the item checklist.
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Press Start, select "Check Stars," then choose a character. Look at the stars. Once all of them are filled with stars, that player will become a superstar.
Nicholas Russo.

Profiles:
Win a single player exhibition game with a player to unlock the M.V.P.'s profile unlocked at the "Exhibition Records" screen.

Hint: Easy home runs:
Go to exhibition mode and play with two players. Have player two as the pitching team, and player one on the batting team. Press A to pitch the ball. As soon as you press A, when player 2 is preparing to pitch, quickly go to player one and charge up for a charge swing. Then, hit the ball when your character is fully charged. Most of the time you will get a home run. Note: Using characters such as Wario, Donkey Kong, Bowser, and other power type characters are recommended.
austin.

Go to challenge mode and choose Yoshi as your captain. Go to Bob-omb Derby (by the Pinita) on easy mode and win. Then, go to the shop. Buy a Power Bat. Then play Peach's team first (the white and pink castle). You should hit continuous homeruns with the Shy Guys. You will later unlock Baby Luigi.
Waluigi.

Hint: Father and Son homeruns:
Bowser must hit a homerun and Baby Bowser must to hit a homerun immediately afterwards. To do this you must not have bought either of their specials (the bullets). Start a game (Yoshi recommended) and use a star with Bowser. If it does not foul you should automatically get a homerun. Repeat this with Baby Bowser. As long as you do not have the specials it result in a homerun almost every time.
Jonathan.

Hint: Easy challenge mode:
You will complete challenge mode quickly if you use Peach's or Yoshi's team. You will then unlock Baby Luigi or Toadette.
Waluigi.

Hint: Nice pitch:
With Mario pitching, press A to make him start his wind-up. When he reaches the top of his jump, press A again to make him pitch a "Nice". Note: This may require a few attempts.
Rene Campos.

Hold A to pitch. Count to four and release A. You will throw a "Nice" pitch.
Andrew Finelli.

To get a "Nice" pitch every time, look for a flashing light under the character when charging. When releasing at this point, he or she should always throw nice pitch, though may require some practice. Note: Waluigi is the best pitcher.
Tallandnerdy.