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* OK K.O.!: Let's Play Heroes (Xbox One, 2018) * Obliteracers (Xbox One, 2016) * ObsCure (Xbox, 2005) * Occultic;Nine (Xbox One, 2017) * Oceanhorn: Monster of Uncharted Seas (Xbox One, 2016) * Octahedron (Xbox One, 2018) * Octodad: Dadliest Catch (Xbox One, 2015) * Oddworld: Abe's Oddysee - New 'n' Tasty! (Xbox One, 2015) * Oddworld: Munch's Oddysee (Xbox, 2001) * Oddworld: Stranger's Wrath (Xbox, 2005) * Odium to the Core (Xbox One, 2018) * Of Orcs and Men (Xbox 360, 2012) * Off the Wall (Xbox 360, 2010) * Office DisOrders (Xbox 360, 2009) * Oh My Godheads (Xbox One, 2017) * Oh...Sir!!: The Insult Simulator (Xbox One, 2017) * Oh...Sir!: The Hollywood Roast (Xbox One, 2018) * Oink! (Xbox 360, 2010) * Old School Adventure (Xbox 360, 2010) * Old School Racer (Xbox 360, 2010) * Old Time Hockey (Xbox One, 2017) * OlliOlli (Xbox One, 2015) * OlliOlli2: Welcome to Olliwood (Xbox One, 2016) * Omega Five (Xbox 360, 2008) * Omega Strike (Xbox One, 2018) * Omerta: City of Gangsters (Xbox 360, 2013) * On a Roll 3D (Xbox 360, 2013) * On a Roll 3D (Xbox One, 2018) * On the Rain-Slick Precipice of Darkness: Episode One (Xbox 360, 2008) * On the Rain-Slick Precipice of Darkness: Episode Two (Xbox 360, 2008) * One Eyed Kutkh (Xbox One, 2018) * One Finger Death Punch (Xbox 360, 2013) * One More Dungeon (Xbox One, 2018) * One Piece: Burning Blood (Xbox One, 2016) * Onechanbara: Bikini Samurai Squad (Xbox 360, 2009) * Onigiri (Xbox One, 2015) * Onimusha: Warlords (Xbox One, 2019) * Onrush (Xbox One, 2018) * Onslaught (Xbox 360, 2010) * Onslaught (Xbox 360, 2009) * Open Season (Xbox 360, 2006) * Open Season (Xbox, 2006) * Operation Darkness (Xbox 360, 2008) * Operation Flashpoint: Dragon Rising (Xbox 360, 2009) * Operation Flashpoint: Red River (Xbox 360, 2011) * Ophidian Wars: Opac's Journey (Xbox 360, 2010) * Opposites (Xbox 360, 2010) * Orbit (Xbox One, 2015) * Orc Attack: Flatulent Rebellion (Xbox 360, 2013) * Orcs Must Die! (Xbox 360, 2011) * Ore no Yome: Anata Dake no Hanayome (Xbox 360, 2010) * Organic Panic (Xbox One, 2016) * Ori and the Blind Forest (Xbox One, 2015) * Otogi 2: Immortal Warriors (Xbox, 2004) * Otogi: Myth of Demons (Xbox, 2003) * Out of the Box (Xbox One, 2018) * OutRun 2 (Xbox, 2004) * OutRun 2006: Coast 2 Coast (Xbox, 2006) * OutRun: Online Arcade (Xbox 360, 2009) * Outbreak: The New Nightmare (Xbox One, 2013) * Outbreak: The Nightmare Chronicles (Xbox One, 2018) * Outcast: Second Contact (Xbox One, 2017) * Outland (Xbox 360, 2011) * Outlast (Xbox One, 2014) * Outlast 2 (Xbox One, 2017) * Outlaw (Xbox 360, 2010) * Outlaw Golf (Xbox, 2002) * Outlaw Golf 2 (Xbox, 2004) * Outlaw Golf: 9 More Holes of X-Mas (Xbox, 2003) * Outlaw Golf: Holiday Golf (Xbox, 2002) * Outlaw Tennis (Xbox, 2005) * Outlaw Volleyball (Xbox, 2003) * Outlaw Volleyball: Red Hot (Xbox, 2003) * Outpost Kaloki X (Xbox 360, 2006) * Over G Fighters (Xbox 360, 2006) * Over the Hedge (Xbox, 2006) * Overcooked (Xbox One, 2016) * Overcooked! 2 (Xbox One, 2018) * Overlord (Xbox 360, 2007) * Overlord II (Xbox 360, 2009) * Overlord: Fellowship of Evil (Xbox One, 2015) * Override: Mech City Brawl (Xbox One, 2018) * Overruled! (Xbox One, 2015) * Overtop (Xbox One, 2017) * Owlboy (Xbox One, 2018) * Oxenfree (Xbox One, 2016) * oOo: Ascension (Xbox One, 2018)
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