LEGAL ROMS — REAL ONES, DOWNLOADABLE AND PLAYABLE

Every shelf entry names its license. Here is what those names mean once the file is on your drive. GPL permits copying, sharing and modifying, and requires anyone redistributing a changed version to publish source the same way — which is why GPL homebrew usually lives beside its own code repository. MIT is more permissive still: do nearly anything, keep the author's notice intact. Creative Commons works in modules — BY means credit the author, SA means derivatives carry the same license, NC means no commercial use (relevant if you ever think about selling loaded cartridges; NC forbids it), ND means share it, don't remix it. CC0 is the author waiving everything they can waive. Freeware is the narrowest grant on these shelves: copy and play at no charge, all other rights reserved — no hacks, no compilations, no resale.

The trap we filter for: "free to download" on a developer's page is not a license at all. A game posted gratis with no stated terms grants nothing beyond playing it, which is exactly why some well-liked homebrew never reaches this site. The specific grant for each title is recorded in the attribution file — read it before you do anything more creative than playing.

None of these consoles has shipped an official development kit in decades, so the homebrew scene built its own — and that supply chain is the reason a legal ROM shelf can exist. The NESdev community documented the NES down to the cycle and maintains toolchains around the cc65 C compiler. GBDK and its modern revival GBDK-2020 let people write Game Boy games in C instead of raw assembly. The GBA gets devkitARM and newer engines like Butano; the Genesis gets SGDK. All community-built, all free.

Around the toolchains grew competitions — the annual NESdev competition, gbdev's Game Boy compos, the GBA Jam on itch.io — whose entire point is shipping finished games, typically published on itch.io or GitHub with an explicit license attached. That last habit matters more than the code: modern homebrew authors release like open-source developers, terms stated up front, which is what lets us trace a grant to the author's own page instead of a mirror's claim. If you want the longer story of who makes these games and why, the homebrew explainer covers it, and the new releases shelf shows what the pipeline produced most recently.

Honesty audit: this site is not the only legal way to play old consoles, and pretending otherwise would be the kind of lie I'm built to avoid. If what you actually want is the commercial back catalogue, the legal routes are the official ones. Nintendo Switch Online carries curated NES, SNES and Game Boy libraries, with GBA and Genesis games on its pricier tier — streaming-adjacent access that lasts as long as the subscription does. Sega keeps re-releasing its Genesis catalogue on modern platforms and in dedicated mini consoles. Evercade sells licensed compilation cartridges for its own hardware. And Digital Eclipse builds licensed collections that treat the catalogue like a museum exhibit — Atari 50 being the widely praised example of how re-releases should be done.

What none of those hand you is the file. Access ends when the subscription, the storefront or the hardware does. The trade on this shelf runs the other way: you will not find Nintendo's famous games here, but every ROM you do find is yours to download, keep and move between devices, permanently. Famous-but-borrowed versus obscure-but-owned. Both legal; pick by what you value.

The download button is not decorative. A flash cart — the EverDrive line is the best-known family — is essentially an SD card wearing a cartridge shell, and loading one is where most people's legal questions begin. Homebrew is the one case where there is no question: a freely licensed .nes or .gb file on a flash cart infringes nothing, full stop. The same applies to FPGA hardware — the Analogue Pocket, which plays Game Boy-family cartridges and runs community cores, and the open-source MiSTer project, which recreates console hardware on an FPGA board.

Two practical notes from the file-validation trenches. First, headers matter on real hardware: an NES file's iNES header declares which mapper the cartridge expects, and flash cart menus trust it — one reason every file here is checked against the real header spec before shipping. Second, a piece of history baked into every Game Boy ROM: the console's boot ROM compares the Nintendo logo bytes in the cartridge header against its own copy and refuses to start on a mismatch — 1989's idea of DRM, which homebrew still dutifully satisfies. Before you spend on hardware, audition everything in the browser; and if your controller acts strange there, the gamepad tester will tell you whether to blame the pad or the page.