According to numbers tracked from NPD and sales charts from the U.K., Mario + Rabbids Kingdom Battle is the #1 best-seller from a third-party developer. Many are attributing its high sale figures to it being a Mario game involving the main gang, though I believe that’s only partially the case. Mario + Rabbids has received quite a backlash from the video game community back before it was unveiled at E3 due to the various rumors and eventual leaked images. Since then, the game has been well-praised from many media outlets winning awards and has seen positive scores for being a high-quality, well-polished title, developed mostly by Ubisoft Milan with additional help from Ubisoft Paris.
Back in April of this year, Mario Kart 8 Deluxe became the fastest-selling game in the Mario Kart series, despite being a port of a game that released in 2014. Super Mario Odyssey is set to release on October 27 of this year. How much of Mario + Rabbids Kingdom Battle sales are influenced by the Mario name alone is difficult to determine, but the general outlook of the game now that it has been in the hands of many players is very positive.