The following are known Action Replay Codes for Austin Powers: Welcome to my Underground Lair! 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 Lives (Maze)
010756da

Max Score (Maze)
01990edb
01990fdb
019910db

Infinite Evil (Kin)
012840d4
012855d4

Infinite Lives (Kin)
0109c0d5

Max Score (Kin)
0199bad5
0199bbd5
0199bcd5