Nintendo has announced that it will shut down Mario Kart Tour on September 29, ending its seven-year run on mobile devices. Originally launching in September 2019, Mario Kart Tour was one of several games released for mobile devices as Nintendo made a push into that space. Most of those games have since been shut down, but Mario Kart Tour proved to be a lucrative spin-off of the main series, employing controversial gacha game mechanics to keep players invested the racer.…