The following are known Action Replay Codes for Alice in Wonderland 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

Stop Timer (Hide And Seek)
01094fc1

Max Stars
016471c1

Always Small Alice!
0101bbc0

Infinite Health
0105bac0

Have Key
0101b9c0