Press A (air horns), D (whistles), S, or W while running around the bases after hitting a home run. Note: Set the Sound FX volume to maximum for best results.
Strike Out
(Using Gravis Gamepad Pro) Hold all for flippers down. Now push up/down on directional pad. Then push blue button, then red, then blue, then green, then yellow, then red. This will give you a strike out as long as you pitch the ball where your opponent can't hit it.
Home Run
(Using Gravis Gamepad Pro) Hold all four flippers down. Now push blue button, then red, then blue, then green, then yellow, then red. Then push left/right on directional button. This will let you hit a monstrous Home Run everytime.
Eddie Matthews
Get a triple play in one game to unlock Eddie Matthews.
Babe Ruth
Hit a homerun with a pitcher.
Mickey Mantle
Hit a homerun with a batter 575 feet or farther to unlock Mickey Mantle.
Strong Arm
Get cought stealing two times by one batter in one game.
Small Bat
Strike out the same batter three times in one game.
Fast Players
Steal 3 bases in one game with the same player to unlock a cheat for very fast players on your team.
Big League Challenge power boost
Hit ten consecutive homeruns in Big League Challenge mode to get a boost in power, which is noted with a flaming baseball. Hit seven more consecutive homeruns to receive another boost in power, which is noted by a pulsating bat.