The following are known Action Replay Codes for Gobs of Games 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

Hangman – No Hangman Code
940051d1

All Puzzle Games – 1 Turn
9100fbca

Paper Games- player 2 score always 1
940010d1
94000dd1

P2 Max Score (Peg Duel)
019949c6

P2 No Score
010049c6

P1 Max Score (Peg Duel)
019947c6

P1 No Score (Peg Duel)
010047c6