The following are known Action Replay Codes for NBA In The Zone 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 1 No Excite Meter
0120eac1

Team 1 Scores Low
0100e4c1
0100e5c1
0100e6c1

Team 1 Scores Max
0109e4c1
0109e5c1
0109e6c1

Team 1Max Excite Meter
0100eac1

Team 2 Max Excite Meter
0100ebc1

Team 2 No Excite Meter
0120ebc1

Team 2 Scores Low
0100e7c1
0100e8c1
0100e9c1

Team 2 Scores Max
0109e7c1
0109e8c1
0109e9c1