| Obake no Q Tarou - Wanwan Panic |
| (Japan) |
BA-OBQ |
40K |
330DE468 |
6 |
| Obocchama-kun |
| (Japan) |
TCF-3Q |
256K |
E24483B1 |
2 |
| Okkotoshi Puzzle - Tonjan! |
| (Japan) |
NMK-JT |
256K |
25EDAF5C |
3 |
| Olympic IQ |
| (Asia) (Ja) (PAL) (Unl) |
TC-015 |
96K |
40DBF7A2 |
1 |
| Onyanko Town |
| (Japan) |
PNF-OT (R49V5901) |
40K |
270EAED5 |
7 |
| Operation Secret Storm |
| (USA) (Unl) |
CDR-OM-81023 |
128K |
EA113128 |
6 |
| Operation Wolf |
| (USA) |
NES-OW-USA |
256K |
EDC3662B |
27 |
| Orb-3D |
| (USA) |
NES-5H-USA |
192K |
958E4BAE |
7 |
| Orebody - Sand Ripples |
| (World) (Rev 1) (Aftermarket) (Homebrew) |
|
41K |
B7917A5F |
1 |
| Otaku no Seiza - An Adventure in the Otaku Galaxy |
| (Japan) |
MAM-OQ |
384K |
4582F22E |
20 |
| Othello |
| (Japan) |
KWD-OH |
40K |
87D7CAF0 |
2 |
| (USA) |
NES-OH-USA |
40K |
699FA085 |
6 |
| Outlanders |
| (Japan) |
VFR-A1 (03) |
128K |
7AA02377 |
14 |
| Over Horizon |
| (Europe) |
NES-Z6-NOE |
256K |
9237B447 |
16 |
| (Japan) |
GAM-Z6 (09) |
256K |
CE06F2D4 |
2 |
| Overlord |
| (USA) |
NES-VL-USA |
256K |
2856111F |
10 |