The following are known Action Replay Codes for NBA Showtime: NBA on NBC on Nintendo Game Boy / Color (GB / GBC). These codes were also known as GameShark Codes and in most cases will work on both devices.

Device Compatibility: Action Replay & GameShark

Team 2 Scores 150
019675c9

Team 2 Scores 0
010075c9

Team 1 Scores 150
019674c9

Team 1 Scores 0
010074c9