Licenses & credits
New website code is GPL-2.0-or-later. Individual engines and game data retain their own licenses. Source-port, reconstruction and replacement-content claims have separate evidence. Contributor licenses do not establish permission for inherited retail code or media. Each game page records its scope and limitations.
| Game / project | Engine | Assets |
|---|---|---|
| Pilotwings 64 | See the upstream project and the clean-room repository | Regenerated clean-room assets; no retail data is distributed |
| Super Mario 64 | See the upstream project and the clean-room repository | Regenerated clean-room assets; no retail data is distributed |
| The Legend of Zelda: Ocarina of Time | See the upstream project and the clean-room repository | Regenerated clean-room assets; no retail data is distributed |
| Super Smash Bros. | See the upstream project and the clean-room repository | Regenerated clean-room assets; no retail data is distributed |
| The Legend of Zelda: Majora's Mask | See the upstream project and the clean-room repository | Regenerated clean-room assets; no retail data is distributed |
| Diddy Kong Racing | See the upstream project and the clean-room repository | Regenerated clean-room assets; no retail data is distributed |
| Perfect Dark | See the upstream project and the clean-room repository | Regenerated clean-room assets; no retail data is distributed |
| GoldenEye 007 | Inherited game code and full emulator dependency licensing remain unverified; a wrapper MIT label is insufficient. | Mixed regenerated media and retained game content; no complete permissive asset clearance established. |
| Star Fox 64 | See the upstream project and the clean-room repository | Regenerated clean-room assets; no retail data is distributed |
| Tonic Tumble | MIT (AngheloAlf/drmario64 decomp); EmulatorJS GPL-3.0, mupen64plus-next GPL-2.0 (see the site's THIRD_PARTY.md) | Original content generated for this project; program built from the drmario64 decomposition |
| Bramble Run | Disassembly: see the upstream project; EmulatorJS GPL-3.0, FCEUmm GPL-2.0 (see the site's THIRD_PARTY.md) | Original content generated for this project; program built from the smb1 disassembly |
| KITHBOUND Dawn and Dusk | Disassembly: see the upstream project; EmulatorJS GPL-3.0, gambatte GPL-2.0 (see the site's THIRD_PARTY.md) | Original content generated for this project; program built from the pokered decomposition |
| Doom 64 | See the upstream project and the clean-room repository | Regenerated clean-room assets; no retail data is distributed |
| Glidewire | fzerox decomp (see upstream); N64Wasm and mupen64plus GPL-2.0 (see the site's THIRD_PARTY.md) | Original content generated for this project; program built from the fzerox decompilation |
| Pokémon Snap | See the upstream project and the clean-room repository | Regenerated clean-room assets; no retail data is distributed |
| Harvest Moon 64 | See the upstream project and the clean-room repository | Regenerated clean-room assets; no retail data is distributed |
| Donkey Kong 64 | Inherited game-code licensing unverified. Upstream identifies EmulatorJS as GPL-3.0 and mupen64plus-next as GPL-2.0; full dependency audit remains incomplete. | Regenerated selected textures and samples; retained geometry, collision, animations, cutscenes, text, music and game code remain uncleared. |
| Conker’s Bad Fur Day | See the upstream project and the clean-room repository | Regenerated clean-room assets; no retail data is distributed |
| Banjo-Tooie | See the upstream project and the clean-room repository | Regenerated clean-room assets; no retail data is distributed |
| Mario Party | See the upstream project and the clean-room repository | Regenerated clean-room assets; no retail data is distributed |
| Mario Party 2 | See the upstream project and the clean-room repository | Regenerated clean-room assets; no retail data is distributed |
| Mario Party 3 | See the upstream project and the clean-room repository | Regenerated clean-room assets; no retail data is distributed |
| Tennis | CC0-1.0 game code; separately licensed SDL2 and Emscripten dependencies | CC0-1.0 procedural game graphics; third-party notices retained |
| Craft | MIT game code; permissive dependencies retain separate notices | CC0-1.0 replacement textures and geometric lettering; MIT shaders |
| Yoshi’s Story | See the upstream project and the clean-room repository | Regenerated clean-room assets; no retail data is distributed |
| 1080° Snowboarding | See the upstream project and the clean-room repository | Regenerated clean-room assets; no retail data is distributed |
| Pokémon Stadium 2 | See the upstream project and the clean-room repository | Regenerated clean-room assets; no retail data is distributed |
| Duke Nukem: Zero Hour | See the upstream project and the clean-room repository | Regenerated clean-room assets; no retail data is distributed |
| Wave Race 64 | See the upstream project and the clean-room repository | Regenerated clean-room assets; no retail data is distributed |
| Graveshift | MIT (engine code derived from luckeyfaraday/kino-der-toten; see the repository) | CC0 models and surfaces (Quaternius, ambientCG and others listed in the repository), procedural props, synthesised sound; no retail data is used or distributed |
| Open Road | MIT (OpenNFS/OpenNFS) | Regenerated clean-room assets; no retail data is distributed |
| Bramble Isles | MIT (snesrev/smw); SDL2 zlib, Emscripten MIT (see the site's THIRD_PARTY.md) | Original content generated for this project; program built from the smw decomposition |
| Open Cadet | MIT | CC0-1.0 replacement data; MIT menu font |
| Open Digger | Mixed: Public Domain, Beer-Ware, BSD-2-Clause, and GPL-2.0; see individual source files | CC0-1.0 replacement levels, graphics, font, title, and icon |
| OpenTTD | GPL-2.0-only | OpenGFX/OpenMSX: GPL-2.0; OpenSFX: CC-BY-SA-3.0 |
| Freedoom | GPL-2.0-or-later (engine) | BSD-3-Clause (Freedoom) |
| Beneath a Steel Sky | GPL-3.0-or-later | Revolution Software freeware license |
| Lure of the Temptress | GPL-3.0-or-later | Revolution Software freeware license |
| Flight of the Amazon Queen | GPL-3.0-or-later | Flight of the Amazon Queen freeware license |
| Sołtys | GPL-3.0-or-later | L.K. Avalon freeware license |
| Doom | GPL-2.0-or-later | Original game data required |
| Quake | GPL-2.0-or-later | Original game data required |
| Open Paths | GPL-3.0-only C implementation; upstream MIT declaration, inherited-code permission unresolved | CC0-1.0 Open Paths replacement campaign |
| Open Skyways | MIT contributor C rewrite; original SkyRoads excluded; third-party code retains separate terms | CC0-1.0 independent Open Skyways replacement data |
| Open Junction | GPL-3.0 reconstruction declaration; original-code permission not obtained per upstream | CC0-1.0 independently authored Open Junction replacement data |
| Contra | vermiceli/nes-contra-us; cc65 zlib; EmulatorJS GPL-3.0; fceumm core GPL-2.0 | None distributed — the player supplies their own ROM |
| Dragon Warrior | Ophis is MIT. The disassembly carries no licence file and is used as a build input only. | No game data is distributed. Graphics, text and music are read from your own cartridge dump at build time and at run time. |
| Fire Emblem: The Sacred Stones | FireEmblemUniverse/fireemblem8u (the repository carries no licence file — ask upstream before redistributing); mGBA core MPL-2.0 | None distributed — the player supplies their own ROM |
| Kirby: Nightmare in Dream Land | overjt/knidl is all-rights-reserved (the pret-style convention); mGBA core MPL-2.0 | None distributed — the player supplies their own ROM |
| The Legend of Zelda: Link's Awakening DX | See the upstream disassembly; it carries no explicit licence file | No game data is distributed; everything comes from the ROM you supply |
| Metroid | EmulatorJS is GPL-3.0; the libretro fceumm and nestopia cores are GPL-2.0; the Ophis assembler is MIT. The disassembly states no licence. | No game data is distributed. Nintendo retains all rights in Metroid. |
| Metroid Fusion | See the upstream decompilation and mGBA (mPL 2.0) | No retail data is distributed; every byte comes from the ROM you supply |
| Metroid: Zero Mission | metroidret/mzm; mGBA core MPL-2.0 | None distributed — the player supplies their own ROM |
| Dr. Mario | See the upstream disassembly; EmulatorJS is GPL-3.0 and is vendored with its licence. | No game data is distributed. Graphics and audio come from the ROM you supply. |
| Excitebike | See the upstream disassembly; EmulatorJS is GPL-3.0 and is vendored with its licence. | No game data is distributed. Graphics and audio come from the ROM you supply. |
| The Legend of Zelda: Oracle of Ages | See the upstream disassembly; its reverse-engineered code belongs largely to Nintendo and Capcom and the author disavows commercial use | No game data is distributed; everything comes from the ROM you supply |
| The Legend of Zelda: Oracle of Seasons | See the upstream disassembly; its reverse-engineered code belongs largely to Nintendo and Capcom and the author disavows commercial use | No game data is distributed; everything comes from the ROM you supply |
| Pokémon Mystery Dungeon: Red Rescue Team | pret/pmd-red (no licence file upstream); mGBA core MPL-2.0 | None distributed — the player supplies their own ROM |
| Pokémon FireRed | pret/pokefirered; EmulatorJS GPL-3.0; mGBA core MPL-2.0 | None distributed — the player supplies their own ROM |
| Pokémon Gold & Silver | EmulatorJS is GPL-3.0 and the Gambatte core is GPL-2.0; the pret/pokegold disassembly is unlicensed research. See web/THIRD_PARTY.md. | No game data is distributed. Everything comes from the ROM you load. |
| Pokémon Crystal | EmulatorJS is GPL-3.0 and the Gambatte core is GPL-2.0; the pret/pokecrystal disassembly is unlicensed research. See web/THIRD_PARTY.md. | No game data is distributed. Everything comes from the ROM you load. |
| Pokémon LeafGreen | pret/pokefirered; mGBA core MPL-2.0 | None distributed — the player supplies their own ROM |
| Pokémon Ruby & Sapphire | pret/pokeruby; mGBA core MPL-2.0 | None distributed — the player supplies their own ROM |
| Pokémon Trading Card Game | EmulatorJS is GPL-3.0 and the Gambatte core is GPL-2.0; the pret/poketcg disassembly is unlicensed research. See web/THIRD_PARTY.md. | No game data is distributed. Everything comes from the ROM you load. |
| Pokémon Yellow | EmulatorJS is GPL-3.0 and the Gambatte core is GPL-2.0; the pret/pokeyellow disassembly is unlicensed research. See web/THIRD_PARTY.md. | No game data is distributed. Everything comes from the ROM you load. |
| Super Mario Bros. 2 | The upstream disassembly carries no licence file. The vendored EmulatorJS is GPL-3.0 and the libretro fceumm and nestopia cores are GPL-2.0. | No game assets are distributed. Super Mario Bros. 2 is © Nintendo. |
| Sonic the Hedgehog | sonicretro/s1disasm; EmulatorJS GPL-3.0; genesis_plus_gx core (Genesis Plus GX licence, NON-COMMERCIAL — redistributions may not be sold or used in a commercial product or activity) | None distributed — the player supplies their own ROM |
| Sonic the Hedgehog 2 | mdcore is MIT; sonicretro/s2disasm is unlicensed research. See web/THIRD-PARTY-NOTICES.txt. | None distributed — the player supplies their own ROM |
| Castlevania: Symphony of the Night | Decompilation sources per the upstream repository; the PCSX-ReARMed core is GPLv2 with no non-commercial clause | No game data is distributed; every byte comes from the disc you supply |
| Super Metroid | See snesrev/sm | None distributed; the game data is read from your own ROM in your browser |
| The Legend of Zelda: The Minish Cap | zeldaret/tmc; mGBA core MPL-2.0 | None distributed — the player supplies their own ROM |
| Wario Land 4 | TsilaAllaoui/warioland4 (fork of lilDavid/warioland4); mGBA core MPL-2.0 | None distributed — the player supplies their own ROM |
| The Legend of Zelda: A Link to the Past | See snesrev/zelda3 | None distributed; assets are extracted from your own ROM in your browser |
| The Legend of Zelda | The upstream disassembly states no licence (no LICENSE file, no terms in its README). The browser runtime is GPL-3.0 EmulatorJS 4.2.3 with the GPL-2.0 libretro fceumm core; every vendored component is itemised in THIRD-PARTY-NOTICES.txt. | No game assets are distributed. Nintendo retains all rights to the game data, which stays on your machine. |
| OpenDuelyst | CC0-1.0 first-party code; MIT, ISC, BSD, Apache-2.0 and 0BSD dependencies | CC0-1.0 project media; separately licensed shaders; system fonts |
| Roboden: Geometric Edition | MIT gameplay code; Apache-2.0/BSD/MIT dependency notices retained | CC0-1.0 independently authored replacement pack; existing bitmap font MIT |
| 2048 | MIT | MIT CSS and text; system fonts |
| ZZT Licensed Demo | MIT OpenZoo/reconstruction; SDL2 zlib and separately noticed Emscripten/runtime libraries | MIT demonstration world; authored glyph/about/host CC0; system fonts retain their own terms |
| Cinder (Abuse source port) | Public-domain developer engine release; credited Bennett GIF decoder permission; own adaptations MIT; separately noticed permissive Emscripten/musl/LLVM runtime | CC0-1.0 independently authored content and native-canvas screenshot; host/build code MIT; system fonts retain separate terms |
| Kiln (Super ZZT port) | MIT OpenZoo and permission-backed reconstruction; own adapters MIT; SDL2 zlib/yuv2rgb BSD-3-Clause and separately noticed permissive Emscripten/musl/LLVM runtime | CC0-1.0 independently authored maps/scripts/help/glyphs; host and world/build generators MIT; font generator CC0; system fonts retain their terms |
| Beacon Yard (Eldritch source port) | Developer zlib grant; TinyXML/SoLoud/zlib separately retained; stb_vorbis MIT; own adapters MIT; separately noticed permissive SDL2/Emscripten/musl/LLVM runtime | CC0-1.0 independently authored data; authored shaders MIT; system fonts retain their separate terms |
| Paper Rooms (Glider 4 source port) | MIT developer-source/JavaScript translation notice retained; authored host/renderer/utilities MIT; no third-party game libraries or native SDK binaries shipped | CC0-1.0 independently authored rooms, procedural graphics/animation design and text; renderer implementation MIT; browser system fonts retain their terms |
| Beacon Relay (Celeste Classic source port) | Author-released Classic.cs MIT; own geometry/host/controller MIT; separately retained .NET/Mono, Emscripten/musl/LLVM, Unicode/ICU, zlib and timezone grants/notices | CC0-1.0 independently authored maps, graphics/animation designs, pixel glyphs, palette and text. Inherited native gameplay/procedural effect algorithms MIT; browser system fonts retain their terms. No audio implementation. |
| Vector Duel (GLFighters source port) | Author-permission-backed GLFighters MIT; own adapters MIT; separately retained gl4es/helper MIT/public-domain, SDL zlib/BSD, Emscripten MIT/NCSA, musl/individual math grants and LLVM/Khronos Apache notices. See bundled NOTICE.txt. | CC0-1.0 independently authored meshes, joint poses, textures/glyph pixels, arena/spawns, edition text and synthesized PCM. Native gameplay/procedural-effect algorithms retain code grants. System fonts are not bundled. |
| Signal Survey (Rogue source port) | BSD-3-Clause-style grant naming original Rogue authors, with separate retained save notices; own adapters MIT. Emscripten MIT/NCSA, musl MIT/individual notices, LLVM Apache-2.0 WITH LLVM-exception and dlmalloc public-domain/adaptation notices. See bundled NOTICE.txt. | CC0-1.0 authored three-station maps/encounters, 95 glyph definitions, item/actor/material presentation names, replacement messages, ending panels and edition UI. Native algorithms/numerical tables/save constants retain code licenses. |
Images
Open Cadet and Open Digger use Andrew Nakas’s CC0 replacement art. OpenTTD screenshots use OpenGFX artwork. Freedoom images show its freely licensed replacement assets. Beneath a Steel Sky retains Revolution Software’s game-art rights. Image provenance is recorded in the source repository.
Engine distributions
Each distributed runtime links to its exact source and build instructions through its manifest. If an attribution or license record is wrong, please report the specific file or entry.