Triple Play 2000 (N64)
After you hit a homerun, except in Homerun Derby, you can produce sounds by hitting any C button. Each C button makes a different noise. Some sounds may be either airhorns, cheers, etc.
When you come to bat, hold the analog stick diagonally up and left and press the B button. If your position is correct you will hit a homerun most of the time.
Three Ball Count - While playing a game, hold L + R + Z and press Up, Down.
Three Outs - While playing a game, hold L + R + Z and press Down, Up.
Add One Run to Home Team - While playing a game, hold L + R + Z and press C-Left(2).
Add One Run to Away Team - While playing a game, hold L + R + Z and press C-Right(2).
Jump the Green Monster - If you feel the ball is going over the Green Monster run toward the fence and press A, A, A, B, B, UP (on D-pad), B, B, B, A. You will then jump the Green Monster.
After about 5 seconds you will apear on top of the Green Monster carrying the ball and waving your hands.
Really Easy Homeruns - When you are batting hold in these buttons, L + R + Z, and then press left, up, left, up on the control pad.
Two Strikes On The Batter - When you are pitching hold in these buttons, L + R + Z, and then press right, up, right, up on the control pad.