It's that cartridge that works in everything except my DSi, which is what I bought it for. DSTwo works in every other DS/3DS I own, just not the DSi. And all my other cartridges work in that DSi, just not the DSTwo. Pretty annoying.
@SylverReZ: They also got sued in a court of law for the Dual Shock business. MS and Nintendo were sued w the exact same copyright infringement. MS paid up, Nintendo paied up, but SONY was stubborn. They finally settled with the plaintiff later on bu the original Dual Shock 3 didn't have dual shock, go figure...
@SylverReZ I think the hardest Nintendo console I jailbroke was a New 2DS XL under 11.15 which required uploading something to a website which generated a file. It's so easy now.