Games & game engines

Author documents REA use

The project README describes Codex using REA with Ghidra to inspect and recover functions. The official REA showcase demonstrates the sound-pan calculation.

Know before you try: Original game files are required. A matching function is not proof of whole-game equivalence; we have not built or played this project.

REA maintainer case study

REA's official showcase verifies a focused bullet-ring inspection. The linked repository is a broader game reconstruction; the evidence does not attribute that whole project to REA.

Know before you try: Full-game validation has separate open work. The repository requires your own legal game copy; its source license does not cover original game assets.

REA tooling present

tools/rea.sh explicitly invokes rea-agents with Ghidra and per-binary snapshots. Tooling presence does not establish that REA produced every engine subsystem.

Know before you try: Requires your own Battlefield 2 installation. The checked README lists missing firing, vehicle control and sound. Not a complete free replacement for the game.

REA tooling present

The README documents a target-independent REA framework. It also says game formats were recovered from data files; this does not prove the entire port was made with REA.

Know before you try: Requires your own game installation. We have not run it or checked retail feature parity. Included research tools are not an endorsement of every project claim.

Independent reimplementation

The upstream README documents a reimplementation of RCT2, supported builds and the requirement for original game data. REA use is not required or claimed.

Know before you try: Requires legally obtained RollerCoaster Tycoon 2 files. Its code license does not include the original game assets. We have not played it or verified feature parity.

Independent reimplementation

The upstream README describes the replacement engine and editor, reports completable main quests and documents mod-compatibility limits. The GitHub repository mirrors development hosted on public GitLab.

Know before you try: Requires ownership of Morrowind and its data. Some original-engine mods depend on quirks not reproduced here. Development-branch version numbers are not release guarantees; no gameplay test was performed.

Independent reimplementation

The upstream README says it aims to mimic and extend Transport Tycoon Deluxe, documents supported platforms and distinguishes free OpenGFX/OpenSFX/OpenMSX assets from optional original game data.

Know before you try: Original graphics or music still require their own rights; free replacement asset sets have separate licenses. Add-ons and third-party components retain their terms. We have not run or benchmarked the game.

Compatibility project

The upstream README explicitly says ScummVM replaces the original executable files while using the game data, and directs readers to per-game compatibility lists. It is not a bundled collection of commercial games.

Know before you try: Support and completeness differ by game and version. You normally need lawful game data, whose license is separate from the engine. Consult the official compatibility list; we did not execute any game.

Independent reimplementation

The README explicitly describes an engine reimplementation, separates engine code from original GOG data and marks the project unfinished. Source contains engine modules and an app; the reviewed passive AI controller only ends its turn.

Know before you try: Needs a legally obtained GOG copy; optional acquisition signs in to GOG. The passive AI stub and brief README do not establish campaign playability or engine parity. We have not built it, signed in to GOG or played it.

No game data is included. Original game assets and third-party dependencies retain their own terms; the engine license does not grant rights to the commercial game.

Independent reimplementation

The README describes reimplementing formats, APIs and behavior from public documentation and Studio observations. Replication is Rook-to-Rook, not wire-compatible with Roblox servers; the roadmap identifies remaining content and gameplay work.

Know before you try: Use only places and assets you own or have rights to. Meshes, textures, characters, GUI, audio and networking remain roadmap work at the reviewed commit. Author-reported load rates do not prove playable games; we have not run or audited it.

Roblox places, models and client assets are not included or licensed by this repository. Dependency notices and permissions for user-supplied content remain separate.

Independent reimplementation

The README describes bottom-up reverse engineering of asset formats before saves, simulation and rendering. The viewer source renders startup and front screens from the user's installation; this is not evidence of complete gameplay.

Know before you try: Requires a legitimate game copy, a C++26 toolchain and currently POSIX builds. The viewer needs GLFW and Vulkan. A front screen is not a playable replacement; full simulation and compatibility are not established. We have not built or run it.

Original game data is not included or covered by the code license. Vendored libraries and optional GNU Unifont downloads have separate notices and licenses.

Independent reimplementation

The upstream README describes an open-source Quake-style engine for Blizzard-era data, names Warcraft III as the primary playable target, lists exploratory WoW/SC2 work, and states that retail game data is not included and the project is unaffiliated with Blizzard. No REA involvement is claimed.

Know before you try: Original Warcraft III / WoW / SC2 assets must be supplied by the user and are not shipped. WoW and StarCraft II targets are exploratory. Submitter reviewed public README/license only; we have not independently tested builds or gameplay.

Independent reimplementation

The upstream README describes Jazz² Resurrection as a reimplementation of Jazz Jackrabbit 2 and states that this repository contains a fully rewritten C++ game. It documents the original-asset requirement and platform matrix. No REA involvement is claimed.

Know before you try: Original Jazz Jackrabbit 2 assets are not included and must be placed in a Source/ directory. Some console ports are experimental or untested on real hardware. Uses extensively modified nCine. Submitter reviewed public README/license only; we have not independently tested it.

Compatibility project

The upstream README describes Ruffle as an Adobe Flash Player emulator written in Rust that targets both desktop and the web using WebAssembly. Project status notes ActionScript 1/2/3 support is strong but unfinished. No REA involvement is claimed.

Know before you try: Not feature-complete versus historical Flash Player; ActionScript gaps remain. Report issues upstream. Submitter reviewed public README/license only; we have not independently tested content compatibility.

See LICENSE.md for third-party notices.

Independent reimplementation

The upstream README describes a from-scratch reimplementation of Fallout: New Vegas, states that behaviour, rules, constants and formulas come from FalloutNV.exe read in Ghidra, and notes that the project contains no game files. No REA involvement is claimed.

Know before you try: Not a full campaign; original saves and NVSE DLLs unsupported; Windows is the tested platform. Original Fallout: New Vegas assets/executable are not included. Submitter reviewed public README/license only; we have not independently tested it.

The author offers MIT or Apache-2.0 at your option. See LEGAL.md for original game asset boundaries.

Independent reimplementation

The upstream README describes a Libre/Free RTS engine supporting early Westwood classics and distributed mods for Red Alert, Tiberian Dawn and Dune 2000. It states EA has not endorsed and does not support the product. No REA involvement is claimed.

Know before you try: Original Westwood/EA assets and trademarks remain with their owners; OpenRA provides engine and community content, not a licensed commercial remaster. Large open issue backlog is typical of a long-lived engine. Submitter reviewed public README/license only; we have not independently tested it.

Independent reimplementation

The upstream README describes OpenXcom as an open-source GPL clone of UFO: Enemy Unknown and Terror From the Deep in C++/SDL. Installation requires vanilla X-COM resources and warns against modded resource packs. No REA involvement is claimed.

Know before you try: Original X-COM assets are not included and must be supplied by the user. Compatibility depends on unmodded resource files. Bundled SDL_gfx-derived code is LGPL with author permission (per README). Submitter reviewed public README/license only; we have not independently tested it.

Bundled SDL_gfx-derived code is LGPL with author permission (per README).

Independent reimplementation

The upstream README describes an open source re-implementation of Chris Sawyer's Locomotion and states that as of December 2025 the game has been reimplemented in C++. It notes the original was x86 assembly on an RCT2-derived engine and that OpenLoco does not share codebase with OpenRCT2. No REA involvement is claimed.

Know before you try: Original Chris Sawyer’s Locomotion assets are not included (Steam/GOG purchase required). Multiplayer and higher map/vehicle limits pending a new save format; still bound to CSL SV5/SC5 save limits until NSF. macOS builds are unsigned. Submitter reviewed public README/license only; we have not independently tested it.

Independent reimplementation

The upstream readme describes openblack as an open source reimplementation of Black & White (2001) in modern C++ with OpenGL/Vulkan and states that original game assets are still required. Repository topics include reverse-engineering; asset extraction docs cover Audio/Data/Scripts from the original install. No REA involvement is claimed.

Know before you try: Original Black & White assets remain copyrighted and are not included. Android/iOS and some cross-compile targets are experimental. Gameplay completeness depends on original assets and ongoing engine work. Submitter reviewed public readme/license only; we have not independently tested it.

Independent reimplementation

The upstream README describes Daggerfall Unity as an open source recreation of Daggerfall in the Unity engine and states that a free copy of DOS Daggerfall is required for assets. It documents cross-platform play without emulation and a community mod ecosystem. No REA involvement is claimed.

Know before you try: Original Daggerfall assets are not redistributed; users supply DOS Daggerfall data. Unity engine runtime is subject to Unity’s own terms for builds. Optional mods can raise system requirements or reduce stability. Submitter reviewed public README/license only; we have not independently tested it.

Unity engine runtime is subject to Unity’s own terms for builds.

Independent reimplementation

The upstream README describes a cross-platform community-driven reimplementation of Plants vs. Zombies GOTY and states that copyrighted assets are not shipped. The author notes code based on public community research/game testing rather than binary RE of the EXE. No REA involvement is claimed.

Know before you try: Requires a legally purchased GOTY copy (main.pak + properties/). Best with GOTY 1.2.0.1073 EN assets; other builds may need compat overrides. Touch UIs are not mobile-optimized. We have not playtested it.

PopCap/EA game IP and assets remain theirs; SexyAppFramework portions retain PopCap Framework acknowledgment.

Independent reimplementation

The upstream README describes rebuilding Carmageddon to run natively, with symbol-driven reverse engineering and a progress chart. Topics include reverse-engineering. Game content is not shipped. No REA involvement is claimed.

Know before you try: Needs original Carmageddon data or freeware demos. Matching progress is incomplete. README also contains conflicting “Public Domain” / non-commercial wording; the LICENSE file is GPL-3.0 — this listing follows the LICENSE file. We have not tested it beyond README/source review.

README also contains conflicting “Public Domain” / non-commercial wording; LICENSE file is GPL-3.0. Original Carmageddon assets remain proprietary.

Independent reimplementation

The upstream README describes Metaforce as a reverse-engineered reimplementation of the Metroid Prime engine and notes a rewrite on the matching decompilation. Topics include reimplementation and reverse-engineering. No REA involvement is claimed.

Know before you try: README states builds are currently unavailable while the project restabilizes after the decompilation rewrite. Original Nintendo/Retro assets are not redistributed. Platform support list is aspirational relative to current build state. We have not tested it.

Independent reimplementation

The upstream README states it is a classic Tomb Raider open-source engine with a WebGL demo and standalone releases. Original game data is required and not redistributed. No REA involvement is claimed.

Know before you try: Compatibility and feature coverage vary by Tomb Raider title. Users must supply legally obtained original game data. Submitter reviewed public README/license only; we have not independently tested it.

Independent reimplementation

The upstream README documents a decompile → GOAL compiler → asset extract/repack → native x86-64 port strategy. Topics include reverse-engineering. Assets are not shipped. No REA involvement is claimed.

Know before you try: Requires a legally purchased PS2 retail disc; later console remasters are out of scope. Windows/Linux/macOS (Rosetta) x86-64 only. Submitter reviewed public README/license only; we have not independently tested it.

Independent reimplementation

The upstream README describes an open-source clean-room reimplementation of Dungeon Siege that loads original data files directly rather than redistributing them. It documents format parsers, a Skrit VM and alpha playable releases. No REA involvement is claimed.

Know before you try: Original Dungeon Siege data required (GOG/Steam/discs). Remaining parity gaps include Bink movies, interior lighting and combat balance. Optional Epic Online Services multiplayer uses Epic’s SDK under separate terms. We have not independently tested it.

Optional Epic Online Services multiplayer uses Epic’s SDK under separate terms (THIRD-PARTY-NOTICES).

Independent reimplementation

The upstream README defines scope as reverse-engineering plus a from-scratch Rust port reading original disc data (not a byte-match decompilation rebuild), with Ghidra provenance and parity tooling. Explicit BYO-disc policy. No REA involvement is claimed.

Know before you try: Sony executable/assets are not redistributed. Remaining bugs, partial retail parity, silent spell voices and keyboard-only native input; USA disc focus for the engine. Submitter reviewed public README/license only; we have not independently tested it.

Dual Unlicense or MIT for repo code/docs; Sony game executable/assets are not covered.

Independent reimplementation

The upstream README describes a reimplementation of Theme Hospital that faithfully recreates the original and adds modern platform support. It states most original features work and the full campaign can be completed. No REA involvement is claimed.

Know before you try: Original Theme Hospital graphics/sound/data required (CD, GOG or EA). Some original features still missing (multiplayer/LAN, AI hospitals, rats, certain videos/art). Submitter reviewed public README/license only; we have not independently tested it.

MIT-style grant for CorsixTH code plus bundled third-party notices; original Theme Hospital assets are not included.

Independent reimplementation

The upstream README describes Dusklight as a reverse-engineered reimplementation of Twilight Princess based on the Twilight Princess decompilation, and states that copyrighted assets are not provided. No REA involvement is claimed.

Know before you try: Requires your own dumped Twilight Princess disc (ISO/RVZ). Does not redistribute Nintendo assets. GPU needs D3D12, Vulkan 1.1+, or Metal for full accuracy; older backends are best-effort. Wii disc play still presents GameCube HUD specifics. We have not independently tested it.

CC0-1.0 for Dusklight code; Nintendo Twilight Princess assets and trademarks remain proprietary.

Independent reimplementation

The upstream README describes a from-scratch Rust port built by reverse engineering the shipped game files, playable start-to-finish from the user’s disc image. No REA involvement is claimed.

Know before you try: Requires a lawful Prototype disc image (~cue). Install script may offer an Internet Archive download—users must ensure they have rights. Smaller community; last upstream push mid-2026. macOS builds unsigned (Gatekeeper). We have not independently tested it.

GPL-3.0 for OpenPrototype code; original Prototype assets remain with their owners.

Independent reimplementation

The upstream README describes OpenYAMM as a modern C++ reimplementation of Might and Magic VI–VIII that uses original game data with HD artwork and states the games are playable with shared systems. No REA involvement is claimed.

Know before you try: Requires original Might and Magic VI–VIII data. Compatibility and polish are ongoing. Windows/Linux/Android supported per README. We have not independently tested it.

GPL-3.0 for OpenYAMM code; New World Computing / Ubisoft game assets remain proprietary.

Independent reimplementation

The upstream README describes an independent reconstruction targeting Tiberian Sun 2.03 Firestorm, based on EA GPL-released related sources plus TS-specific reverse engineering, and states original assets are not distributed. No REA involvement is claimed.

Know before you try: Not an EA remaster or official source release. Original Tiberian Sun assets required and not redistributed. GitHub license field is unset (NOASSERTION); listing follows LICENSE.md (GPL-3.0-or-later plus EA Section 7 terms on derived files). We have not independently tested it.

GPL-3.0-or-later with Electronic Arts additional terms under GPL Section 7 on material derived from EA-released Red Alert sources; Tiberian Sun game assets remain proprietary.

Independent reimplementation

The upstream README describes a from-scratch clean-room engine for Arena that does not distribute game assets, with a documented current-status feature list. No REA involvement is claimed.

Know before you try: Requires original Arena game data (not redistributed). Quests, spells, potions, plate materials and save/load are not yet implemented per README. We have not independently tested it.

MIT for OpenTESArena code; Bethesda Softworks Arena assets remain proprietary.

Independent reimplementation

The upstream README describes OpenRW as a cross-platform, open-source re-implementation of Grand Theft Auto III and states that a legitimate copy of the original PC game is required. No REA involvement is claimed.

Know before you try: Requires the original GTA III PC game files; Rockstar assets are not redistributed. Mission completeness is tracked upstream rather than claimed as full parity. We have not independently tested it.

OpenRW code is GPL-3.0-or-later; bundled dependencies (FFmpeg, Bullet, SDL) keep their own licenses; GTA III assets remain Rockstar/Take-Two property.

Independent reimplementation

The upstream README describes an open-source reimplementation of the GTA San Andreas game engine in Unity and states that you need to own GTA to play it. No REA involvement is claimed.

Know before you try: Author states it will not be a complete reimplementation. Requires a PC GTA San Andreas installation; development needs Unity 2020.3+. Upstream activity has slowed. We have not independently tested it.

San Andreas Unity code is MIT; GTA San Andreas assets remain Rockstar/Take-Two property.

Independent reimplementation

The upstream README describes xoreos as an open-source implementation of BioWare’s Aurora engine and its derivatives, lists the target games, and states that no actual normal gameplay is implemented yet. No REA involvement is claimed.

Know before you try: Resource, format, graphics and sound foundations exist, but normal gameplay is not implemented; mostly area viewing and partial menus. Requires original game installations, which are not redistributed. We have not independently tested it.

xoreos code is GPL-3.0-or-later; BioWare and other publishers’ game data remain proprietary.

Independent reimplementation

The upstream README describes an open-source reimplementation of The Sims 2 using the Unity game engine and documents progress on menus and neighborhood views. No REA involvement is claimed.

Know before you try: Not a playable Sims 2 replacement yet: basic main menu, neighborhood chooser and early neighborhood view. Requires a configured Sims 2 Ultimate Collection install; EA assets are not redistributed. We have not independently tested it.

OpenTS2 code is MPL-2.0; The Sims 2 assets remain EA property.

Independent reimplementation

The upstream README describes a free, open-source Rust reimplementation of the classic Windows 3.1 screensaver and lists the original resource files the user must supply, which it does not include. No REA involvement is claimed.

Know before you try: Requires three original screensaver files (SCRANTIC.SCR, RESOURCE.MAP, RESOURCE.001) beside the binary. Unsigned binaries may trigger OS warnings. Young single-maintainer project. We have not independently tested it.

Open Scrantic code is MIT; Screen Antics assets remain with their rights holders.

Independent reimplementation

The upstream README describes a reverse-engineering project reimplementing Jackie Chan Stuntmaster, reconstructing game logic, data structures and formats, and states it is not a PS1 emulator. No REA involvement is claimed.

Know before you try: Only NTSC-U SLUS-00684 is targeted (PAL unsupported); Windows/Linux x86_64 only. Requires the user’s own disc image; assets are extracted locally. Completeness level is not stated upstream. We have not independently tested it.

ReChan code is MIT and does not cover the original game or its assets.

Independent reimplementation

The upstream README describes a function-by-function TypeScript port (not an emulator) whose routines were reverse-engineered from the 68010 disassembly and tested against MAME, and documents its Ghidra/MAME method. No REA involvement is claimed.

Know before you try: Requires user-supplied MAME ROM ZIPs. Audio is not globally bit-perfect, attract/insert-coin audio is unfinished, and known bugs remain. Small single-maintainer project. We have not independently tested it.

Marble Love code is MIT (see NOTICE and THIRD_PARTY.md); Marble Madness ROMs and Atari IP remain with rights holders.

Independent reimplementation

The upstream README describes a faithful engine reimplementation of StarLancer, with reimplemented engine modules, Ghidra scripts and type maps, and docs on file formats and reverse engineering. No REA involvement is claimed.

Know before you try: Requires assets from a retail StarLancer copy. Mission editor, multiplayer and standalone engine are still in development. Young project (created Sept 2026). We have not independently tested it.

OpenReliant code is MPL-2.0; docs are CC BY-SA 4.0; dependencies keep their own licenses; StarLancer assets remain proprietary.

Independent reimplementation

The upstream README describes an open-source reimplementation of the Might & Magic VI–VIII game engine that uses the original game data, and states that currently only MM7 is playable. No REA involvement is claimed.

Know before you try: Only MM7 is currently playable; MM6/MM8 are planned. Nightly builds only; Android untested by the team; unsigned macOS binaries. Requires your own game data. We have not independently tested it.

OpenEnroth code is LGPL-3.0; Might and Magic game data remains proprietary.

Independent reimplementation

The upstream README describes an open-source reimplementation of Remedy’s Alan Wake engine, later known as Northlight, with the goal of running Alan Wake and American Nightmare portably. No REA involvement is claimed.

Know before you try: Documents a free-camera viewer over loaded game data; no playable gameplay is claimed. Requires your own Alan Wake data and many system dependencies. We have not independently tested it.

OpenAWE code is GPL-3.0-or-later except bundled 3rdparty libraries; Alan Wake data remains Remedy property.

Independent reimplementation

The upstream README describes sacengine as an engine reimplementation for Sacrifice and explains running it with the original maps and data folder. No REA involvement is claimed.

Know before you try: The README does not publish feature or parity status (roadmap is external). Requires original Sacrifice data, the LDC D compiler to build, and extra DLLs on Windows. We have not independently tested it.

sacengine code is GPL-3.0; Sacrifice data and maps remain proprietary.

Compatibility project

The upstream README describes a ground-up reimplementation that treats the legacy data as authoritative, tracks per-game NIF parse rates in a compatibility matrix, and writes the NIF parser against the niftools nif.xml community spec. No REA involvement is claimed.

Know before you try: The strongest documented claim is format and data compatibility; full gameplay parity with any title is not claimed. Requires your own Bethesda game data. Small, young project. We have not independently tested it.

ByroRedux code is MIT; Ruffle and other dependencies keep their own licenses; Bethesda game data remains proprietary.

Independent reimplementation

The upstream README describes a reimplementation of Kenshi that runs original content, mods and saves, lists an early playable slice, and states that readers and game logic use interoperability facts without distributing proprietary SDKs, original content or decompiled code. No REA involvement is claimed.

Know before you try: Early playable slice only: AI is partial and full gameplay parity is not claimed; UI fidelity gaps are tracked in the roadmap. Windows 10/11 with a Vulkan 1.3 GPU; other platforms untested. Requires an installed legal copy of Kenshi; no game assets are shipped. We have not independently tested it.

MeitouClient code is GPL-3.0-or-later with an additional license exception (LICENSE-EXCEPTION.md); FSR/DLSS vendor files are separate runtime dependencies; Kenshi assets remain Lo-Fi Games property.

Independent reimplementation

The upstream README states that CONFIG.EXE, ISLE.EXE and LEGO1.DLL are completely decompiled and that a verified rebuild reproduces all three retail binaries byte for byte, with per-function reccmp accuracy reports and a ReproBit verification report. No REA involvement is claimed.

Know before you try: Targets 32-bit Windows only and stays true to the original release; the cross-platform port is the separate isle-portable repository. Original game assets are not included and a LEGO Island install is required. We have not independently tested it.

isle code is LGPL-3.0; LEGO Island assets remain the property of their rights holders; d3drm.dll may need to be sourced separately.

Independent reimplementation

The upstream README describes the project as reverse engineering of 3D Pinball for Windows – Space Cadet from the Windows XP pinball.exe and its public PDB (plus Full Tilt! Pinball), using Ghidra, IDA and Visual Studio, with all subroutines decompiled and converted to compilable C++. No REA involvement is claimed.

Know before you try: Original game resources are not included; users must supply Windows or Full Tilt! data files. Development is slow and community console ports are maintained separately. We have not independently tested it.

SpaceCadetPinball code is MIT; SDL2 keeps its own license; original game data remains Microsoft/Maxis property.