Franchises starting with O

Primary full run

SEGA Genesis - Nintendo Switch Online

Nintendo Switch / Nintendo Switch 2

The Switch Online Genesis release is the current official route for the original game with save/rewind convenience; older Steam, mobile, Virtual Console, compilation, and mini-console paths do not add exclusive playable content.

Definitive edition

SEGA Genesis - Nintendo Switch Online

Primary full run

Original Sega Saturn release

Sega Saturn

The Legend of Oasis is a Sega Saturn prequel/successor with no sourced modern port or remaster, so the original Saturn version is the complete version.

Definitive edition

Original Sega Saturn release

Primary full run

Steam PC release

Windows PC

The Windows PC/Steam release is the best primary route because it is the current official PC version of Obscure, while the PS2 and Xbox versions have no sourced exclusive content advantage.

Definitive edition

Steam PC release

Primary full run

Steam PC release

Windows PC

The Windows PC/Steam release is the best primary route because it is the current official PC version of Obscure II, while the PS2, Wii, and PSP versions have no sourced exclusive content advantage.

Definitive edition

Steam PC release

Primary full run

Observer: System Redux on Steam

Windows PC

Observer: System Redux is the best route for the original Observer because it is the upgraded and expanded version with redesigned visuals, rebuilt mechanics, and additional story content, while the PC release gives the highest-fidelity capture path.

Fidelity vs completeness conflict

System Redux changes and expands the 2017 game; choose it for fidelity and completeness, and use the 2017 original only to compare the launch presentation.

Definitive edition

Observer: System Redux

Primary full run

Observer: System Redux on Steam

Windows PC

The Windows PC release is the best System Redux route because it is the expanded version with redesigned visuals, rebuilt mechanics, and extra story content, plus the strongest capture and settings flexibility.

Definitive edition

Observer: System Redux

Primary full run

Current Octopath Traveler Windows PC build

Windows PC

Octopath Traveler is now broadly available, and the Windows route gives the cleanest capture/settings path for the original HD-2D RPG without adding platform-exclusive story content.

Definitive edition

Current Windows PC build

Primary full run

Current 1.0 Steam release

Windows PC

Odd Realm reached 1.0 on August 16, 2024 and is a sandbox colony simulation developed by Unknown Origin Games. Windows, macOS, and Linux/SteamOS are supported. No sourced console or mobile release was found in this pass, so Windows PC is the main capture route while the other native desktop builds are valid alternatives.

Definitive edition

Odd Realm 1.0 on Windows PC

Primary full run

Original Abe's Oddysee PC release, with New 'n' Tasty documented separately

Windows PC

The queue title is the original 1997 game. New 'n' Tasty is a full remake with modern visuals and gameplay changes, so it should be documented as a secondary/remake route rather than replacing the original.

Fidelity vs completeness conflict

The remake has higher visual fidelity but is a changed route; the original 1997 game should remain its own archive target.

Definitive edition

Original PC release for Abe's Oddysee; New 'n' Tasty separately for remake coverage

Primary full run

Odin Sphere Leifthrasir

PlayStation 4

Leifthrasir is a full remake that keeps the story intact while improving mechanics, performance, and presentation; PS4 is the highest-fidelity shipped platform.

Definitive edition

Odin Sphere Leifthrasir

Primary full run

Current Gameforge OGame live service

Web browser

OGame is a long-running real-time browser MMO. The official Gameforge browser service is the content authority, while mobile access is a companion route for the same persistent account/universe style of play.

Definitive edition

Current Gameforge browser service

Primary full run

PlayStation CD release

PlayStation

The PlayStation port is a CD-era enhanced route with official English availability; Saturn and mobile releases are Japan-only routes and Virtual Console versions are convenience rereleases of the older game.

Definitive edition

PlayStation CD release

Primary full run

Tactics Ogre: Reborn

Windows

Reborn is the modern remaster of the PSP remake, released on Windows and current consoles with improved graphics and sound, revised mechanics, and full English/Japanese voice acting; Windows is the most capture-friendly high-fidelity route.

Fidelity vs completeness conflict

Reborn is the strongest fidelity route and modernizes the PSP remake, while the older releases remain useful for historical mechanics/localization comparison rather than required secondary content.

Definitive edition

Tactics Ogre: Reborn on Windows

Primary full run

Nintendo 64 original via emulator

Nintendo 64

Ogre Battle 64 is an N64 game with later Virtual Console rereleases of the same version; accurate N64 emulation gives the cleanest high-resolution capture route.

Definitive edition

Nintendo 64 version via emulator

Primary full run

Japan-only Neo Geo Pocket Color release

Neo Geo Pocket Color

This side story was released only for Neo Geo Pocket Color in Japan; no official localized or remastered version is documented.

Definitive edition

Neo Geo Pocket Color original

Primary full run

Game Boy Advance original

Game Boy Advance

The Knight of Lodis is documented as a Game Boy Advance title and no higher-fidelity official remake is documented.

Definitive edition

Game Boy Advance original

Primary full run

Okami HD

Windows PC

Okami HD is the current official high-resolution route, with Capcom documenting 4K support on supported PC hardware, PS4 Pro, and Xbox One X. PC gives the best capture/settings path for the HD remaster.

Definitive edition

Okami HD on Windows PC

Primary full run

PC release

Windows

OlliOlli began on PlayStation Vita in January 2014, then came to Windows, OS X, Linux, PlayStation 3, PlayStation 4, Android, Nintendo 3DS, Wii U, Xbox One, and Switch through the later OlliOlli: Switch Stance collection. Windows is the highest-fidelity and most accessible single-game route for the original precision skateboarding game.

Definitive edition

Windows PC release; OlliOlli: Switch Stance is a convenient portable collection

Primary full run

PC release

Windows

OlliOlli2: Welcome to Olliwood released first for PlayStation 4 and PlayStation Vita in March 2015, then came to Windows, OS X, Linux, Android, Xbox One as XL Edition, and Nintendo Switch through the Switch Stance collection. Windows is the highest-fidelity and most straightforward preservation route for the sequel.

Definitive edition

Windows PC release; OlliOlli: Switch Stance is a convenient portable collection

Primary full run

PC release with VOID Riders and Finding the Flowzone DLC where owned

Windows

OlliOlli World released for Nintendo Switch, PlayStation 4, PlayStation 5, Windows, Xbox One, and Xbox Series X/S in February 2022, then added the VOID Riders and Finding the Flowzone expansions later in 2022. Windows with both expansions installed is the highest-fidelity and most complete route.

Definitive edition

Windows PC release with VOID Riders and Finding the Flowzone DLC where owned

Primary full run

Original PlayStation release

PlayStation

Omega Boost was released for PlayStation as Polyphony Digital's non-racing shooter, and no sourced higher-fidelity port, remaster, or remake was identified.

Definitive edition

Original PlayStation release

Primary full run

Console release with added content

Nintendo Switch / PlayStation 4 / Xbox console build

The original Steam PC release is the easiest capture route, but the later console builds added content not present in the Steam version. Because Omori is a 2D RPG where fidelity differences are modest, the archive route should prioritize the more complete console build.

Fidelity vs completeness conflict

Steam PC is the easiest capture route, but console builds add content not present there; verify Xbox/Microsoft Store availability before relying on that route.

Definitive edition

Console release with added content, platform availability verified

Primary full run

Original PC release with compatibility fixes / Anniversary Edition documented if used

Windows PC

Oni has no sourced current storefront route, and the Windows/Mac originals are the main high-fidelity capture routes. The PS2 version is useful for comparison, but the PC route preserves the original action/shooter controls with better capture flexibility.

Fidelity vs completeness conflict

No current official rerelease is sourced; compatibility fixes and community Anniversary Edition state must be logged if used.

Definitive edition

Original Windows PC release with compatibility fixes documented

Primary full run

2019 HD remaster

Windows PC

The PC HD remaster has the highest fidelity and modern controls, with widescreen support, smoother framerate, rerecorded soundtrack, and easier weapon switching.

Fidelity vs completeness conflict

The PC HD remaster is the fidelity pick, but it does not include Genma Onimusha's Xbox-exclusive tower, armor, and green-soul additions.

Definitive edition

PC HD remaster plus Genma Onimusha secondary content

Primary full run

2025 HD remaster

Windows PC

The PC remaster runs at high resolution/60fps, supports widescreen, adds modern analog controls and quality-of-life changes, and unlocks bonus materials from the start.

Fidelity vs completeness conflict

The remaster is the fidelity and gameplay pick, but the PS2 original preserves several removed special-option media items.

Definitive edition

PC HD remaster plus PS2 bonus-media check

Primary full run

Original GBA release

Game Boy Advance via mGBA

Onimusha Tactics is a GBA-only tactical RPG spin-off; high-quality GBA emulation gives the cleanest preservation route.

Definitive edition

Game Boy Advance original

Primary full run

Original PS2 release

PlayStation 2 via PCSX2

Blade Warriors is a PS2-only platform-fighter spin-off; PCSX2 gives the best practical image quality while preserving the original game.

Definitive edition

PlayStation 2 original

Primary full run

Original PS2 release

PlayStation 2 via PCSX2

The Windows port is documented as a weak conversion with low framerate and sound issues, so the PS2 original via PCSX2 is the best fidelity/completeness balance.

Fidelity vs completeness conflict

Native PC would normally win on fidelity, but the documented quality problems make upscaled PS2 the recommended route.

Definitive edition

PlayStation 2 original via PCSX2

Primary full run

Original Japan mobile release

Mobile

Curtain of Darkness is a Japan-only mobile Onimusha release with no modern port documented.

Fidelity vs completeness conflict

Released mobile title, but current availability/preservation route is unclear.

Definitive edition

Original mobile release

Primary full run

Original PS2 release

PlayStation 2 via PCSX2

Dawn of Dreams is a PS2-only main-series sequel with no modern port documented; PCSX2 provides the highest practical fidelity.

Definitive edition

PlayStation 2 original

Primary full run

North American PS2 compilation

PlayStation 2

Onimusha Essentials bundles Warlords, Onimusha 2, and Onimusha 3 for PS2; it is useful as a historical compilation, but not the best route for Warlords or Onimusha 2 after their remasters.

Fidelity vs completeness conflict

Convenient PS2 package, but the first two games now have higher-fidelity remasters.

Definitive edition

PS2 compilation for collection purposes only

Primary full run

Original browser service

Browser

Onimusha Soul began as a browser-based game before mobile and PS3 releases; as a shut-down service, it is an archival entry rather than a currently playable recommendation.

Fidelity vs completeness conflict

Online-service game with no current official playable route documented.

Definitive edition

Defunct original browser service

Primary full run

Original arcade VR release

Japanese arcade VR

Shadow Team is documented as the first VR Onimusha entry and released for Japanese arcades in March 2025.

Fidelity vs completeness conflict

Location-based arcade VR title; access depends on venue availability.

Definitive edition

Original arcade VR release

Primary full run

Needs post-release research

Announced - unreleased

Way of the Sword is announced for 2026 and has not shipped as of June 18, 2026, so final platform performance/content comparisons cannot be made.

Primary full run

Xbox One physical/digital release

Xbox One

Onrush released on PlayStation 4 and Xbox One; an announced Windows version did not ship, online servers shut down on 30 November 2022, and digital console versions were delisted. With no PC version and no sourced platform-exclusive content, Xbox One is the practical primary console-family route.

Definitive edition

Xbox One console-family release

Primary full run

ARMA: Cold War Assault / Operation Flashpoint: Cold War Crisis with Resistance content documented

Windows PC

The PC route is the original high-fidelity simulation baseline and the current official digital route under Bohemia's ARMA: Cold War Assault naming. It preserves mouse/keyboard control, mission-editor/mod context, and the expansion lineage better than the later Xbox Elite port.

Fidelity vs completeness conflict

The PC route has the fidelity/editor/mod ceiling, while Xbox Elite is an official but constrained console adaptation. Expansions must be documented separately for completeness.

Definitive edition

ARMA: Cold War Assault / original PC release with expansion state documented

Primary full run

Orbiter 2024 open-source release

Windows PC

Orbiter 2024 is the current release and the project is now open-source under the MIT License, making it the best maintained route for high-fidelity spaceflight simulation. Earlier 2000/2010/2016 freeware builds remain important for addon compatibility and version-history comparison.

Fidelity vs completeness conflict

Current Orbiter and older addon-compatible builds may differ; addon state must be documented.

Definitive edition

Orbiter 2024 open-source Windows release

Primary full run

Definitive Edition

Windows

The Definitive Edition adds new areas, difficulty options, fast travel, and full backtracking; Windows is the most flexible high-fidelity native route.

Definitive edition

Ori and the Blind Forest: Definitive Edition

Primary full run

Current PC release

Windows

Windows is the native release with the broadest display/settings route; the Xbox Series X/S version is strong at 4K/120, but PC remains the flexible archive target.

Definitive edition

Current Windows release

Primary full run

Current Steam Early Access release

Windows PC

Ostriv's current release targets Microsoft Windows, while Linux and Mac are roadmap items. The Early Access release began March 19, 2020, making Windows PC the only playable platform and therefore the complete primary route.

Definitive edition

Ostriv on Windows PC

Primary full run

Current official osu! desktop build

Windows PC

The official site currently presents a Windows 10+ x64 osu! download as the main route, while the older osu!(stable) Windows build is still linked separately. Windows PC gives the cleanest capture/input-latency route for this user-generated rhythm-game library.

Fidelity vs completeness conflict

Completeness depends on client branch, account state, beatmap availability, and online service state rather than a fixed shipped cartridge/disc.

Definitive edition

Current official Windows osu! build; keep osu!(stable) noted for compatibility-sensitive replays

Primary full run

Original Nintendo DS cartridge

Nintendo DS

Ouendan was released only for Nintendo DS, and its stylus/touchscreen timing is central to the game, so the original DS release is the complete primary route.

Definitive edition

Original Nintendo DS release

Primary full run

Original Nintendo DS cartridge

Nintendo DS

Elite Beat Agents was released for Nintendo DS and is the international counterpart to Ouendan with its own characters, scenarios, and licensed-song set; the original DS cartridge is the complete route.

Definitive edition

Original Nintendo DS release

Primary full run

Original Nintendo DS cartridge

Nintendo DS

Ouendan 2 was released only for Nintendo DS, adds the sequel's rival cheer squad and four-player wireless support, and has no documented modern port.

Fidelity vs completeness conflict

The cartridge is the only official release, but historical limited-time DS Download Station skins/multiplayer characters are no longer normally obtainable.

Definitive edition

Original Nintendo DS release

Primary full run

Archaeologist Edition

Windows

The Archaeologist Edition bundles the base game with Echoes of the Eye, and Windows gives the most flexible native fidelity/settings route.

Definitive edition

Outer Wilds: Archaeologist Edition

Primary full run

Outlast plus Whistleblower DLC on Steam

Windows PC

The Windows PC route is the best main playthrough because it has the complete base game, PC capture/settings flexibility, and direct access to the Whistleblower story DLC that overlaps with and extends the original game's plot.

Definitive edition

Outlast plus Whistleblower DLC on Windows PC

Primary full run

Steam release

Windows PC

The Windows PC release is the best route because it is the same full game with PC capture/settings flexibility, and Outlast 2 has no DLC campaign that would force a separate completeness route.

Definitive edition

Windows PC Steam release

Primary full run

Steam release

Windows PC

The Windows PC release is the best main route because it supports solo or co-op play, has PC capture/settings flexibility, and launched alongside the same 1.0 content family as the console versions.

Definitive edition

Current updated Windows PC release

Primary full run

Sega Ages Out Run

Nintendo Switch

The 1986 arcade game received many home ports and later Sega Ages/3D Classics releases. Sega Ages on Switch is the best current official route to the arcade game, with modern presentation and the corrected audio used in later re-releases; the Genesis/Mega Drive and 3DS versions remain secondary for their unique extras.

Fidelity vs completeness conflict

Switch is the main fidelity/current-access route; Genesis/Mega Drive and 3DS have unique version-specific extras.

Definitive edition

Sega Ages Out Run on Nintendo Switch

Primary full run

Sega 3D Reprint Archives release

Nintendo 3DS

OutRun 3-D is a distinct Master System game built for Sega's stereoscopic glasses, later ported to Nintendo 3DS as part of Sega 3D Reprint Archives. The 3DS release is the best official way to preserve the stereoscopic concept.

Definitive edition

Nintendo 3DS Sega 3D Reprint Archives release

Primary full run

Original arcade release

Arcade

Turbo OutRun is the arcade follow-up to Out Run and was ported to several computers plus FM Towns and Mega Drive. No modern definitive release or exclusive home content is documented, so the arcade version is the fidelity route.

Definitive edition

Original arcade release

Primary full run

Original Master System release

Master System

Battle Out Run is a Master System-only Out Run spin-off with Chase H.Q.-style car-ramming objectives and upgrades. With no other platform documented, Master System is the only route.

Definitive edition

Original Master System release

Primary full run

Amiga release

Amiga

Out Run Europa is a Probe/U.S. Gold spin-off across European computers plus Game Gear and Master System. With no arcade original and no platform-exclusive content documented, Amiga is the selected 16-bit home-computer route.

Definitive edition

Amiga release

Primary full run

Original console release

Mega Drive / Genesis

OutRun 2019 is a Genesis/Mega Drive pseudo-sequel with futuristic routes and a rocket-boosted car. The 2005 Play TV Legends release is a plug-and-play reissue, but the original console version is the full primary route.

Definitive edition

Original Mega Drive/Genesis release

Primary full run

Original Sega System 32 Multi release

Arcade

OutRunners restored the route-forking, lighthearted Out Run feel in arcades and was later ported to Genesis/Mega Drive. The arcade version supports linked multiplayer and is the fidelity/feature route.

Definitive edition

Original arcade release

Primary full run

Original Xbox release

Xbox

OutRun 2 launched in arcades and came to Xbox with 480p anamorphic widescreen, home challenge modes, Xbox Live support, unlockable Scud Race/Daytona USA 2 tracks, extra cars/music, and the original Out Run. For this specific entry, Xbox is more complete than the arcade version.

Fidelity vs completeness conflict

Arcade is authentic; Xbox is more complete with home challenges, online mode, bonus tracks, cars, music, and the original Out Run unlockable.

Definitive edition

Original Xbox release

Primary full run

OutRun 2 SP DX / SDX arcade release

Arcade

OutRun 2 SP added 15 new courses, and SP DX/SDX later moved to Sega Lindbergh hardware with higher resolution and cooperative Ferrari-cabinet play. For the arcade update itself, SP DX/SDX is the highest-fidelity cabinet route; the content also appears in OutRun 2006.

Fidelity vs completeness conflict

SP DX/SDX is the cabinet-fidelity route; OutRun 2006 is the practical home route for SP content but lacks the cabinet/co-op setup.

Definitive edition

OutRun 2 SP DX / SDX arcade release

Primary full run

PC release

Windows

Coast 2 Coast combines an OutRun 2 SP conversion with a career-style Coast 2 Coast mode and shipped on Xbox, PS2, PSP, and Windows. Windows is the fidelity route, but the PSP version has a different mission set and the PS2/PSP link/Japanese PS2 unlock handling creates a completeness caveat.

Fidelity vs completeness conflict

Windows is the fidelity route; PSP has a different mission set, and Japanese PS2 changes unlock availability.

Definitive edition

Windows release plus PSP/Japanese PS2 supplements

Primary full run

XBLA release if already owned

Xbox 360

OutRun Online Arcade is an HD, online-focused adaptation of the OutRun 2 line with reduced content versus OutRun 2006, released on XBLA and European PSN before Ferrari-license delisting. The Xbox 360 version is the broader primary route if already owned; PS3 is Europe-only.

Fidelity vs completeness conflict

Online Arcade has HD presentation but less content than OutRun 2006 and is delisted due to Ferrari licensing.

Definitive edition

Xbox 360 XBLA release if already owned

Primary full run

Original Overcooked PC release with DLC/Gourmet Edition content documented

Windows PC

The original PC route preserves the first game's unremastered physics, controls, and level presentation while offering clean capture. Overcooked! All You Can Eat is a higher-fidelity remastered package with online play and extra content, but it changes the preservation target and also includes Overcooked 2.

Fidelity vs completeness conflict

Original PC best preserves the 2016 game; All You Can Eat is more complete and higher fidelity but remasters the first game and includes Overcooked 2.

Definitive edition

Original PC/Gourmet route for the first game; All You Can Eat for remastered collection coverage

Primary full run

Overlord plus Raising Hell expansion / current PC release

Windows PC

Overlord's best archive route is PC with the Raising Hell expansion available, because it preserves the original game and adds the major expansion content while keeping high-quality capture and control flexibility.

Fidelity vs completeness conflict

Base game and Raising Hell expansion state must be logged; PC with expansion is the complete capture route.

Definitive edition

Windows PC release with Raising Hell expansion available

Primary full run

Original 6v6 Overwatch service

Windows (service discontinued)

The original Overwatch released on Windows, PlayStation 4, Xbox One, and later Nintendo Switch, but it was replaced by Overwatch 2/current Overwatch service. Windows is the archival reference route because it had the strongest capture path, but the original service is no longer normally playable.

Fidelity vs completeness conflict

Original Overwatch was replaced by the sequel/current service; this is a preservation entry rather than a current recommendation.

Definitive edition

Original Windows service state, preserved historically

Primary full run

Current Overwatch live service

Windows

Overwatch 2 launched as the replacement for Overwatch and later branding/current materials returned to the Overwatch name. The current service is available across Windows, PlayStation, Xbox, Nintendo Switch, and Nintendo Switch 2. Windows is the best archive route because it has the broadest capture/settings ecosystem.

Fidelity vs completeness conflict

Current service is the recommended route, but it replaced the original Overwatch and has live-service mode/branding changes over time.

Definitive edition

Current Windows live-service client

Primary full run

Current PC release

Windows PC

The Windows PC version is the original release route and the best capture/fidelity path. Mac, Linux, Switch, PS4, and Xbox One ports do not add sourced exclusive content.

Definitive edition

Owlboy on Windows PC

Primary full run

A. S. Douglas noughts-and-crosses program

EDSAC simulator / preserved documentation

OXO is a 1952 EDSAC noughts-and-crosses artifact, so the archive target is documentation and an EDSAC simulation route rather than a commercial rerelease. It should be logged as a historical reconstruction with input/output limitations noted.

Fidelity vs completeness conflict

Original EDSAC context is historical; any playable route is a reconstruction or simulator.

Definitive edition

Historical EDSAC artifact with simulator/reconstruction notes

Primary full run

Current PC release with gameplay DLC through The Aquatic Planet Pack

Windows PC

The Windows PC version is the most straightforward current route for the base game and all gameplay DLC, with the best capture/settings support. macOS and Linux are useful native routes, but Windows PC remains the primary support/capture target.

Definitive edition

Oxygen Not Included on Windows PC with the gameplay DLC packs

Primary full run

Original PS4 release

PlayStation 4 / PlayStation 5 backward compatibility

The Order: 1886 is a PS4-only game with no PC/remaster route. The PS4 version is playable on PS5, so original PS4 media or PS5 backward compatibility is the archive path.

Definitive edition

Original PlayStation 4 release

Primary full run

1971 mainframe concept and later MECC text lineage documented

Original text/MECC lineage via preserved or emulated route

The Oregon Trail began as a 1971 educational mainframe game and became widely known through later MECC microcomputer editions. The archive route should distinguish the historical text lineage from the modern Gameloft reimagining, which is useful but not a replacement for the original.

Fidelity vs completeness conflict

The 1971/mainframe, Apple II classroom, and modern Gameloft routes are different historical targets.

Definitive edition

Documented original/MECC text lineage; modern Gameloft version only as comparison

Primary full run

The Outer Worlds: Spacer's Choice Edition after May 2026 storefront changes

Windows PC

Spacer's Choice Edition is the single current PC storefront route after the original base game and DLC were removed from most PC/current-gen storefronts in May 2026. It includes the expansions and newer patches, but the original 2019 build remains relevant for launch-version preservation.

Fidelity vs completeness conflict

Spacer's Choice is current/complete, but launch-version behavior requires an owned original build.

Definitive edition

The Outer Worlds: Spacer's Choice Edition on PC