The following are known Action Replay Codes for Madden NFL 2002 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

Away Team Scores 255
91ff45d1

Away Team Scores 0
910045d1

Home Team Scores 255
91ff46d1

Home Team Scores 0
910046d1

Infinite Time Outs Home
91032fd1

0 Time Outs Home
91002fd1

Infinite Time Outs Away
91032ed1

0 Time Outs Away
91002ed1

Turn GS Switch On For More Game Time
91043ace
91633bce

Always First Down
910134ce

Infinite Play Clock
91193ece

Start On 4th Quarter
910435ce