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- Oh So Hero! #2086050 pending native
- Oik #588970 pending unknown
- Oik 2 #611980 pending unknown
- Oik 3 #655100 pending unknown
- Oil Rush #200390 pending unknown
- Oirbo #1074280 pending unknown
- Okay, Panic! #1098790 pending unknown
- Okhlos: Omega #400180 pending unknown
- Old Friend #570000 pending unknown
- Omegalodon #248350 pending unknown
- Omen Exitio: Plague #668590 pending unknown
- Ominous Tales: The Forsaken Isle #645410 pending unknown
- OmniFootman #1076230 pending unknown
- Omnipresent #403660 pending unknown
- On a Roll #377060 pending unknown
- On Board #757290 pending unknown
- On Board 4 PC #840180 pending unknown
- Once Ever After #951860 pending unknown
- Once in Yaissor #553790 pending unknown
- Once Upon A Puppet #1904880 pending unknown
- On Earth As It Is In Heaven - A Kinetic Novel #662260 pending unsupported
- One Dark Night #460510 pending unknown
- One Day in London #465180 pending unknown
- One Dreamer #1156380 pending unknown
- One-Eyed Likho #2346840 pending unknown
- One Final Breath™ #387070 pending unknown
- One Gun: Cat #924900 pending unknown
- One Late Night: Deadline #337880 pending unknown
- One Man Is Not No Man #453510 pending unknown
- One More Dungeon #415030 pending native