The following are known Action Replay Codes for Inspector Gadget: Operation Madkactus 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

Infinite Health Gadget
9110c5ca

Infinite Health Penny & Brain
9103c6ca

Infinite Lives
9163c4ca

Max G Bonus
9114c3ca

Level Modifier
91xx52ca
Replace xx with 0 thru 12

Have Rubber Arrow
91ff49cc

Have Net Launcher
91ff4acc

Have Helicopter
91ff4bcc

Have Photo Flash
91ff4ccc

Infinite Weapons Energy Gadget
91ff48cc

Infinite Air Penny
91ffc8ca

Float In Air!
91ff9dca