Eight days. That is roughly how long it took, from a public Switch 2 jailbreak — about sixteen and a half months after the console launched in June 2025 — to a PC emulator booting Mario Kart World at a speed its authors are willing to call playable.

Two projects, one weekend

On 29 October, modder Takoroka published an experimental Switch 2 integration for the Switch emulator Eden under the name Eden NX2. The author was explicit that it is a work in progress and needs many more fixes. It was enough of a foundation for others to build on: within days a fork called Eglantine — started by developer Camille LaVey and derived from Eden, Yuzu and Sudachi, written in C++ with builds for Windows, Linux and macOS — was running Mario Kart World at "decent/full speed, depending on specs and configuration", with video of it reaching up to 60 fps on capable hardware. A second title, Splatoon Raiders, boots but runs at a variable, low frame rate and crashed in at least one recorded clip.

What "running" means here

Not a finished emulator. Missing meshes come from shaders that simply are not implemented yet; frames stutter; the compatibility list is short. Eglantine calls itself very experimental, and the honest reading of the milestone is architectural: the Switch 2's protection has been mapped far enough that a general-purpose emulator — not a per-game recompilation — can execute commercial software.

That distinction matters. Alongside the emulator work there has been a wave of AI-assisted native ports: The Legend of Zelda: Link's Awakening, the Pokémon: Let's Go titles, and nxnative, which took Mario Kart World to macOS and, in a demo, to an iPhone 18 Pro. Those are one-off translations of a single binary. An emulator that runs one game today is, in principle, a platform that runs the library tomorrow.

The development is itself AI-assisted

Eglantine's README and coverage of the project both describe heavy AI assistance in its development, which is part of why the pace looks unlike earlier console generations. Yuzu and Ryujinx, the two most popular Switch emulators, took years to reach comparable maturity; here the first playable builds arrived within days of the jailbreak.

The legal shadow

Nintendo's response to Switch emulation has been litigation, not indifference: Yuzu settled and shut down in 2024, Ryujinx followed. Nothing about the current crop has been tested in court, and Eglantine's own documentation points users at dumping software from a copy they own. Whether a project built on AI-assisted reverse engineering and published as FOSS changes Nintendo's enforcement calculus is the open question of the next few months — as is whether the pace of the last two weeks survives the first legal letter.

What to watch

Two signals. Whether compatibility spreads beyond Nintendo's kart racer and Splatoon Raiders to titles that lean harder on the platform's new hardware features, and whether the upstream Eden project absorbs the NX2 work or the forks keep diverging. For now the accurate description is: the wall is down, the road is unpaved.

Sources