You must be holding down numbers 1 through 4 (not on NumPad) while performing the cheat. At the Stadium Select screen, move all the way to the right, displaying the last 9 parks. Click on the following stadiums in order: Houston, Atlanta, Philadelphia, Pittsburgh, Atlanta, and then Montreal. You should hear a voice say "Triple Play 99." Now move back to the right to find the three new ball parks.
Hold down 1, 2, 3 & 4 keys (not the ones on the NumPad) while the following
cheats are being performed. Left, Right, Down and Up are performed with the
arrow keys (not the ones on the NumPad).
Mammoth Homerun Tab, Shift, Tab, Alt, Ctrl, Shift, Left, Right. Do this while the batter is walking to the batters box or while he is in the batters box.
Easy Strikeout Up, Down, Tab, Shift, Tab, Alt, Ctrl, Shift. Do this while you're on the mound. Announcer Comments Commercials Left, Shift, Right, Alt Nicknames Alt, Right, Shift, Left Stadium info Down, Ctrl, Right, Alt
Weather Ctrl, Down, Tab, Up A Story Up, Tab, Right, Alt Crowd Noises Big Cheer Shift, Left, Left, Shift Little Cheer Tab, Up, Up, Tab
ooh! Ctrl, Down, Down, Ctrl boo! Alt, Right, Right, Alt Rounding the bases after a homer d to make the crowd whistle s to hear a piano a to hear a horn w to hear a bigger horn