# Koin by The Retro Saga

> Koin is a free, private cloud platform for retro game preservation. Users upload their legally owned ROMs and play them in the browser across devices with cloud saves, automatic metadata, instruction manuals, world maps, and RetroAchievements. 20+ retro systems supported including NES, SNES, Game Boy, Genesis, N64, and PlayStation.

Koin is built by The Retro Saga. It is not a ROM distribution site — it is a personal library manager for legally owned game backups. The platform provides:

- Browser-based emulation powered by koin.js, an open-source RetroArch WebAssembly engine
- Cloud save synchronization across all devices
- Automatic game metadata, box art, and cover images
- High-res scans of original instruction manuals
- Detailed world maps for Metroidvanias and exploration games
- RetroAchievements integration for earning achievements in retro games
- Curated retro game music collections and soundtracks

## Main Pages

- [Home](https://koin.theretrosaga.com/): Landing page with product overview, feature highlights, and supported systems
- [Game Archive](https://koin.theretrosaga.com/archive): Searchable database of retro games across 20+ systems with filters by genre, era, and platform
- [Instruction Manuals](https://koin.theretrosaga.com/manuals): Digital preservation of original game instruction booklets with high-res scans
- [The Atlas](https://koin.theretrosaga.com/atlas): High-resolution world maps for classic Metroidvanias and retro games
- [Music Collections](https://koin.theretrosaga.com/music): Curated soundtracks from the golden age of gaming organized by era and system
- [Transmissions](https://koin.theretrosaga.com/transmissions): Engineering blog with updates, changelogs, and deep dives from the Koin team

## Console Pages

- [NES](https://koin.theretrosaga.com/consoles/nes): Nintendo Entertainment System — history, specs, and defining titles
- [SNES](https://koin.theretrosaga.com/consoles/snes): Super Nintendo Entertainment System
- [Game Boy](https://koin.theretrosaga.com/consoles/gb): Nintendo Game Boy
- [Game Boy Advance](https://koin.theretrosaga.com/consoles/gba): Nintendo Game Boy Advance
- [N64](https://koin.theretrosaga.com/consoles/n64): Nintendo 64
- [Genesis](https://koin.theretrosaga.com/consoles/genesis): Sega Genesis / Mega Drive
- [PlayStation](https://koin.theretrosaga.com/consoles/psx): Sony PlayStation
- [Atari 2600](https://koin.theretrosaga.com/consoles/atari2600): Atari 2600

## Video Games

Each game has a detail page at `/games/{slug}` with metadata, platform info, genre, release year, cover art, maps, music, and manuals where available. The database contains thousands of titles. Representative examples:

- [Super Mario Bros. (NES)](https://koin.theretrosaga.com/games/super-mario-bros): The platformer that defined a generation — NES, 1985
- [The Legend of Zelda: A Link to the Past (SNES)](https://koin.theretrosaga.com/games/the-legend-of-zelda-a-link-to-the-past): Top-down action-adventure — SNES, 1991
- [Super Metroid (SNES)](https://koin.theretrosaga.com/games/super-metroid): The definitive Metroidvania — SNES, 1994
- [Sonic the Hedgehog (Genesis)](https://koin.theretrosaga.com/games/sonic-the-hedgehog): Sega's iconic speed platformer — Genesis, 1991
- [Pokemon Red (Game Boy)](https://koin.theretrosaga.com/games/pokemon-red-version): The RPG that launched a global phenomenon — Game Boy, 1996
- [Super Mario 64 (N64)](https://koin.theretrosaga.com/games/super-mario-64): Pioneering 3D platformer — N64, 1996
- [Final Fantasy VII (PlayStation)](https://koin.theretrosaga.com/games/final-fantasy-vii): The JRPG that went mainstream — PlayStation, 1997
- [Castlevania: Symphony of the Night (PlayStation)](https://koin.theretrosaga.com/games/castlevania-symphony-of-the-night): Genre-defining action RPG — PlayStation, 1997

Game manuals are available at `/manuals/{slug}` for titles with preserved instruction booklets.

## Articles

- [Introducing Koin.js](https://koin.theretrosaga.com/transmissions/koin-deck-player-launch): How we built an open-source, Netflix-grade retro game engine for the web with zero-lag input, threaded video, and mobile haptics

## Optional

- [Legal](https://koin.theretrosaga.com/legal): Content policy, DMCA procedures, and preservation mission statement
- [koin.js on GitHub](https://github.com/muditjuneja/koin): Open-source retro game player component for React
- [koin.js Demo](https://koin-retro-player.theretrosaga.com/): Live demo of the open-source emulator component