 | Obduction | Cyan Inc | 7/10 |  |
 | Observation | Devolver Digital | 8/10 |  |
 | Oceanhorn: Monster of Uncharted Seas | Cornfox & Bros. | 7/10 |  |
 | Oceanhorn: Monster of Uncharted Seas | Cornfox & Bros. | 6/10 |  |
 | OCO | SPECTRUM48 | 7/10 |  |
 | Octodad: Dadliest Catch | Young Horses | 8/10 |  |
 | Octopath Traveler | Square Enix | 8/10 |  |
 | Oddworld: Abe's Oddysee - New 'n' Tasty! | Oddworld Inhabitants | 7/10 |  |
 | Odysseus Kosmos and his Robot Quest: Episode 1 | HeroCraft | 7/10 |  |
 | Offworld Trading Company | Stardock Entertainment | 7/10 |  |
 | Old Man's Journey | Broken Rules | 6/10 |  |
 | OlliOlli | Devolver Digital | 7/10 |  |
 | Omega Zodiac | Proficient City | 3/10 |  |
 | Omensight | Spearhead Games | 6/10 |  |
 | One Dog Story | Big Way | 6/10 |  |
 | One Piece: Burning Blood | Bandai Namco | 6/10 |  |
 | One Piece: Unlimited World Red Deluxe Edition | Bandai Namco | 7/10 |  |
 | One Upon Light | Rising Star Games | 7/10 |  |
 | One Way Heroics | Playism | 5/10 |  |
 | OneShot | Degica | 8/10 |  |
 | Ookibloks | Skyboy Games | 7/10 |  |
 | Oppaidius Desert Island! | Vittorio Giorgi (SbargiSoft) | 6/10 |  |
 | Oppaidius Summer Trouble! | Vittorio Giorgi (SbargiSoft) | 7/10 |  |
 | Oppaidius Tropical Cruise! | Vittorio Giorgi (SbargiSoft) | 7/10 |  |
 | Orcs Must Die! | Robot Entertainment | 7/10 |  |
 | Order of the Thorne: The King’s Challenge | Infamous Quests | 4/10 |  |
 | Ori and the Blind Forest | Microsoft Game Studios | 9/10 |  |
 | Ori and the Will of the Wisps | Xbox Game Studios | 9/10 |  |
 | Oriental Empires | Iceberg | 5/10 |  |
 | Original Journey | Another Indie | 5/10 |  |
 | Out of Order | Hungry Software | 8/10 |  |
 | Out There: Omega Edition | Mi-Clos Studio | 5/10 |  |
 | OUTBUDDIES | Headup | 6/10 |  |
 | Outland | Housemarque | 8/10 |  |
 | Outriders | Square Enix | 5/10 |  |
 | Outward | Deep Silver | 4/10 |  |
 | Overcooked | Team17 | 8/10 |  |
 | Overfall | Pera Games | 7/10 |  |
 | Overgrowth | Wolfire | 6/10 |  |
 | Overwatch | Blizzard | 8/10 |  |