| Obduction | 3 | 2018-Nov-28 |
| Obey Me | 2 | 2020-Oct-31 |
| Oblivion | 1 | 2018-Feb-24 |
| Octogeddon | 1 | 2018-Feb-14 |
| Octopath Traveler | 6 | 2021-Jan-07 |
| Oddworld: New 'n' Tasty | 1 | 2019-May-30 |
| Oddworld: Stranger's Wrath | 1 | 30.10.2017 |
| Of Orcs And Men | 1 | 04.01.2017 |
| Office Battle | 1 | 19.12.2016 |
| Offworld Trading Company | 3 | 2020-May-05 |
| Oh...Sir!! The Insult Simulator | 1 | 23.03.2017 |
| Okami HD | 5 | 24.12.2017 |
| Okhlos Omega | 1 | 23.02.2017 |
| Onechanbara Z2: Chaos | 3 | 2018-Jun-15 |
| OneeChanbara | 1 | 2021-Jan-08 |
| One Finger Death Punch 2 | 2 | 2019-May-04 |
| One Piece: Burning Blood | 4 | 20.01.2017 |
| One Piece: Pirate Warriors 3 | 1 | 10.01.2016 |
| One Piece: Pirate Warriors 4 | 5 | 2020-Dec-30 |
| One Piece: Unlimited World Red | 4 | 29.08.2017 |
| One Piece World Seeker | 5 | 2019-Sep-20 |
| One Punch Man: A Hero Nobody Knows | 1 | 2020-Feb-29 |
| One Step From Eden | 2 | 2020-Aug-01 |
| One Troll Army | 1 | 01.08.2016 |
| Onimusha: Warlords | 2 | 2019-Jan-24 |
| Oninaki | 3 | 2019-Sep-02 |
| Onirism | 2 | 2019-Oct-21 |
| Onlink | 1 | 01.08.2016 |
| Omega Labyrinth Life | 1 | 2020-Jan-18 |
| Omega Quintet | 1 | 31.12.2017 |
| Open Surge | 1 | 2020-May-25 |
| OpenXcom | 1 | 2020-Jul-01 |
| Operation Abyss: New Tokyo Legacy | 1 | 01.04.2017 |
| Operation Flashpoint 2: Dragon Rising | 3 | 11.01.2014 |
| Operencia: The Stolen Sun | 3 | 2020-Jun-17 |
| Orcs must die! | 1 | 2018-May-12 |
| Order of Battle: World War II | 2 | 08.08.2017 |
| Order Of The Gatekeepers | 1 | 2020-Feb-12 |
| Ori and the Blind Forest | 3 | 2018-Nov-22 |
| Ori and the Will of the Wisps | 4 | 2020-Nov-15 |
| Orbital Gear | 1 | 09.07.2016 |
| Oriental Empires | 2 | 2018-Dec-11 |
| Orion Prelude | 2 | 24.09.2016 |
| Osiris: New Dawn | 7 | 2020-Jan-28 |
| Ostalgie: The Berlin Wall | 4 | 2020-Feb-10 |
| Ostriv | 2 | 2018-Jul-19 |
| The Other 99 | 2 | 02.12.2016 |
| Othercide | 3 | 2020-Nov-12 |
| Out of the Park Baseball 18 | 1 | 12.04.2017 |
| Out There: Ω Edition | 1 | 2020-Mar-21 |
| Outbreak: Pandemic Evolution | 1 | 30.06.2017 |
| Outcast: Second Contact | 3 | 30.11.2017 |
| Outcast: Second Contact | 3 | 30.11.2017 |
| Outer Wilds | 3 | 2020-Nov-17 |
| Outer Worlds | 8 | 2020-Nov-02 |
| Outlast | 1 | 2020-Apr-11 |
| Outlast 2 | 3 | 2021-Jan-09 |
| Outlaws of the Old West | 5 | 2020-Sep-12 |
| Outpost Zero | 1 | 2018-Jul-16 |
| Outsiders | 1 | 2018-Jun-25 |
| Outward | 6 | 2020-Sep-15 |
| Owlboy | 2 | 05.11.2016 |
| Overcooked | 2 | 2018-Feb-02 |
| Overcooked 2 | 3 | 2020-Apr-05 |
| Overkill VR | 1 | 23.01.2017 |
| OVERKILL's: The Walking Dead | 5 | 2019-Feb-01 |
| Overland | 1 | 2019-Sep-21 |
| Overload | 2 | 2019-Jul-01 |
| Overlord 2 | 1 | 2018-Jul-27 |
| Oxenfree | 1 | 2018-May-14 |
| Oxygen Not Included | 3 | 2019-Sep-10 |
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