| One Piece games | Games based on the manga and anime franchise One Piece created by
Eiichiro Oda, ... | 5 |
| One Must Fall series | | 2 |
| Oneechanbara series | Sexy girls in bikinis fighting zombies bursting with blood with
katana swords, ... | 5 |
| One-button games | Games that only use one button for all input. Generally, these are
game where ... | 52 |
| Omnitrend science fiction universe | Games set in the universe introduced by Omnitrend's Universe. They
take place ... | 8 |
| Ollo Legacy | A series of shoot-'em-up games created by ECP in the '80s.
| 2 |
| Ōkami series | A series of games based on Japanese myths and starring divine beings
incarnated ... | 2 |
| Oil's Well versions | | 2 |
| O'Hare's Adventure series | A series of Adventure games by John O'Hare for the Commodore PET | 3 |
| Ogre Battle series | | 6 |
| Officially-licensed Marble Madness games | Official conversions of Atari Games's fast-paced ball-control coin-op | 4 |
| Oddworld series | Created by Oddworld Inhabitants, Oddworld is a fictional universe and
a series ... | 11 |
| ObsCure series | A series of survival horror games, developed by Hydravision
Entertainment. | 2 |
| Oasis series | Ancient Co. Ltd.'s pair of Arabian-styled action-RPGs, co-developed
and ... | 2 |
| Nyet series | | 2 |
| NUGA-CEL! series | Ports and reissues of Idea Factory's cosplay simulation RPG NUGA-CEL!
The title ... | 4 |
| N series | | 3 |
| Nox series | | 2 |
| Novel Ware games | Created by System Sacom, the denominator Novel Ware was applied to
adventure ... | 8 |
| Nova series | A series of puzzle games by CP Verlag where the object is to guide
one or more ... | 2 |
| No Time To Explain series | | 2 |
| Notgames | Notgames is an umbrella term for a group of games (by different
developers) ... | 5 |
| No One Lives Forever series | The series of first-person shooters includes the original The
Operative: No One ... | 7 |
| Nooch series | | 3 |
| Non-traditional Westerns | The 1981 movie Outland was pitched to its producers very simply:
"It's High ... | 20 |
Game Group