ns2jb is a software-only, tethered jailbreak for the Switch 2. It allows running arbitrary native code as any ordinary sysmodule, and as the built-in fs sysmodule. This lets us run homebrew, reverse engineer and mod Switch 2 games, back up save files off the Switch, and access most of the Switch 2’s peripherals through MMIO. To my knowledge, it’s the first such exploit for the Switch 2.
To demonstrate the capabilities of this jailbreak, Codex modded a Switch 2 exclusive, Mario Kart World. Thanks to my friends in Dabney House who helped me choose characters to add and playtest the game.
Edit: Many people have been asking me if I actually used this prompt. No, it’s just a silly caption. I set a /goal for userland code execution, but that didn’t succeed. The jailbreak itself took substantial effort for ~2 weeks. The Mario Kart World, however, was entirely vibecoded in a day, and was just for fun.
