 | Obduction | Cyan | 7/10 |  |
 | Obduction | Cyan | 7/10 |  |
 | Observation | Devolver Digital | 8/10 |  |
 | Observer | Bloober Team | 6/10 |  |
 | Observer: System Redux | Bloober Team | 7/10 |  |
 | Oceanhorn 2: Knights of the Lost Realm | Cornfox & Bros. | 5/10 |  |
 | Oceanhorn: Monster of Uncharted Seas | Cornfox & Bros. | 7/10 |  |
 | Oceanhorn: Monster of Uncharted Seas | Cornfox & Bros. | 6/10 |  |
 | Oceanhorn: Monster of Uncharted Seas | Cornfox & Bros. | 5/10 |  |
 | Oceanhorn: Monster of Uncharted Seas | Cornfox & Bros. | 7/10 |  |
 | Oceanhorn: Monster of Uncharted Seas | Cornfox & Bros. | 6/10 |  |
 | OCO | SPECTRUM48 | 7/10 |  |
 | Octahedron | Square Enix | 8/10 |  |
 | Octahedron: Transfixed Edition | Square Enix | 8/10 |  |
 | Octodad: Dadliest Catch | Young Horses | 8/10 |  |
 | Octodad: Dadliest Catch | Young Horses | 7/10 |  |
 | Octopath Traveler | Square Enix | 9/10 |  |
 | Octopath Traveler | Square Enix | 8/10 |  |
 | Octopath Traveler II | Square Enix | 7/10 |  |
 | Oddworld: Abe's Oddysee | GT | 9/10 |  |
 | Oddworld: Abe's Oddysee - New 'n' Tasty! | Oddworld Inhabitants | 8/10 |  |
 | Oddworld: Abe's Oddysee - New 'n' Tasty! | Oddworld Inhabitants | 8/10 |  |
 | Oddworld: Abe's Oddysee - New 'n' Tasty! | Oddworld Inhabitants | 8/10 |  |
 | Oddworld: Abe's Oddysee - New 'n' Tasty! | Oddworld Inhabitants | 7/10 |  |
 | Oddworld: Abe’s Oddysee - New 'n' Tasty! | Oddworld Inhabitants | 7/10 |  |
 | Oddworld: Munch’s Oddysee | Oddworld Inhabitants | 4/10 |  |
 | Oddworld: Soulstorm | Oddworld Inhabitants | 9/10 |  |
 | Oddworld: Soulstorm Enhanced Edition | Oddworld Inhabitants | 6/10 |  |
 | Odin Sphere Leifthrasir | NIS America | 9/10 |  |
 | Odin Sphere Leifthrasir | NIS America | 9/10 |  |
 | Odin Sphere Leifthrasir | NIS America | 9/10 |  |
 | Odium to the Core | QubicGames | 5/10 |  |
 | Odysseus Kosmos and his Robot Quest: Episode 1 | HeroCraft | 7/10 |  |
 | Offworld Trading Company | Stardock Entertainment | 7/10 |  |
  | Ogre Battle 64: Person of Lordly Caliber | Square Enix | 8/10 |  |
 | Oh My Godheads | Square Enix | 5/10 |  |
 | Oh...Sir!! The Insult Simulator | Vile Monarch | 7/10 |  |
 | Okami | Capcom | 9/10 |  |
 | Okami HD | Capcom | 8/10 |  |
 | Okami HD | Capcom | 9/10 |  |
 | Okami HD | Capcom | 7/10 |  |
 | Okamiden | Capcom | 8/10 |  |
 | Old Man's Journey | Broken Rules | 4/10 |  |
 | Old Man's Journey | Broken Rules | 6/10 |  |
 | Old School Musical | Plug In Digital | 9/10 |  |
 | Old Time Hockey | V7 Entertainment | 7/10 |  |
 | OlliOlli | Curve | 8/10 |  |
 | OlliOlli | Curve Digital | 7/10 |  |
 | OlliOlli | Curve | 7/10 |  |
 | OlliOlli | Devolver Digital | 7/10 |  |
 | OlliOlli World | Private Division | 9/10 |  |
 | OlliOlli World | Private Division | 9/10 |  |
 | OlliOlli2: XL Edition | Team17 | 7/10 |  |
 | OlliOlli: Switch Stance | Gambitious Digital | 8/10 |  |
 | Olympia Soiree | Aksys | 6/10 |  |
 | Omega Labyrinth Life | D3 Publisher | 8/10 |  |
 | Omega Pattern HD | Borokai Studio | 7/10 |  |
 | Omega Zodiac | Proficient City | 3/10 |  |
 | Omen of Sorrow | EastAsiaSoft Limited | 5/10 |  |
 | Omensight | Spearhead | 7/10 |  |
 | Omensight | Spearhead | 6/10 |  |
 | One Dog Story | Big Way | 6/10 |  |
 | One Night Stand | Ratalaika Games | 8/10 |  |
 | One Night Stand | Ratalaika Games | 6/10 |  |
 | One Piece: Burning Blood | Bandai Namco | 6/10 |  |
 | One Piece: Burning Blood | Bandai Namco | 6/10 |  |
 | One Piece: Pirate Warriors 3 | Bandai Namco | 8/10 |  |
 | One Piece: Pirate Warriors 4 | Bandai Namco | 7/10 |  |
 | One Piece: Romance Dawn | Namco Bandai | 3/10 |  |
 | One Piece: Unlimited Cruise SP | Namco Bandai | 4/10 |  |
 | One Piece: Unlimited World Red | Namco Bandai | 8/10 |  |
 | One Piece: Unlimited World Red Deluxe Edition | Bandai Namco | 7/10 |  |
 | One Piece: Unlimited World Red Deluxe Edition | Bandai Namco | 7/10 |  |
 | One Punch Man: A Hero Nobody Knows | Bandai Namco | 5/10 |  |
 | One Upon Light | Rising Star Games | 7/10 |  |
 | One Upon Light | Rising Star Games | 7/10 |  |
 | One Way Heroics | Playism | 5/10 |  |
 | One-Way Ticket | Zodiac Interactive Limited | 8/10 |  |
 | Onechanbara Z2: Chaos | NIS America | 6/10 |  |
 | Onee Chanbara ORIGIN | D3 Publisher | 5/10 |  |
 | OneShot | Degica | 8/10 |  |
 | Onimusha: Warlords | Capcom | 7/10 |  |
 | Oninaki | Square Enix | 7/10 |  |
 | Onrush | Koch Media | 8/10 |  |
 | Onrush | Koch Media | 7/10 |  |
 | Ookibloks | Skyboy | 7/10 |  |
 | oOo: Ascension | Extra Mile Studios | 5/10 |  |
 | Operation Abyss: New Tokyo Legacy | NIS America | 5/10 |  |
 | Operation Babel: New Tokyo Legacy | NIS America | 3/10 |  |
 | Operencia: The Stolen Sun | Zen | 7/10 |  |
 | Opoona | Koei | 7/10 |  |
 | Oppaidius Desert Island! | Vittorio Giorgi | 6/10 |  |
 | Oppaidius Summer Trouble! | Vittorio Giorgi | 7/10 |  |
 | Oppaidius Tropical Cruise! | Vittorio Giorgi | 7/10 |  |
 | Orcs and Elves | EA | 8/10 |  |
 | Orcs Must Die! | Robot | 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 Blind Forest: Definitive Edition | Xbox Game | 9/10 |  |
 | Ori and the Will of the Wisps | Xbox Game Studios | 9/10 |  |