| Version | Serial | Size | CRC32 | Number of Codes | |||
|---|---|---|---|---|---|---|---|
| Oddworld Adventures | |||||||
| (USA, Europe) | DMG-AODE-USA, DMG-AODP-EUR | 512K | 6510C0E2 | 2 | |||
| Olympic Summer Games | |||||||
| (USA, Europe) (SGB Enhanced) | DMG-AO9E-USA, DMG-AO9P-EUR | 512K | BE81BD61 | 7 | |||
| Olympic Winter Games - Lillehammer '94 | |||||||
| (USA) | DMG-YC-USA | 128K | 1A98F0A4 | 2 | |||
| Oni | |||||||
| (USA) | 2M | 3 | |||||
| Oni V - Oni wo Tsugumono | |||||||
| (Japan) (SGB Enhanced) | DMG-AO5J-JPN | 256K | AF030940 | 1 | |||
| Operation C | |||||||
| (USA) | DMG-CN-USA | 128K | 2EBBC1AE | 34 | |||
| Othello | |||||||
| (Europe) | DMG-OT-UKV | 32K | E6607E29 | 1 | |||
| Otto's Ottifanten - Baby Bruno's Alptraum | |||||||
| (Europe) (En,Fr,De,Es) | DMG-AOBP-NOE | 256K | 0C228A78 | 2 | |||
| Out of Gas | |||||||
| (USA) | DMG-FX-USA | 128K | 1B67E8B1 | 8 | |||
| Oyatsu Quiz Mogu Mogu Q | |||||||
| (Japan) (SGB Enhanced) | DMG-AMQJ-JPN | 256K | 79E05789 | 2 | |||