The following are known Action Replay Codes for HardBall 99 on Sony Playstation (PS1).

The codes should work with the region specified but may work for other regions as well.

Device Compatibility: Action Replay, CodeBreaker & GameShark

Away Team Scores 0
300e3ee80000

Away Team Scores 50
300e3ee80032

Home Team Scores 0
300e3ee90000

Home Team Scores 50
300e3ee90032