Mario Kart Tour has already reached 129.3 million downloads on the Google Play store and Apple App Store, a Monday report by Sensor Tower says. It was outraced only by in its first 30 days and has since .
back in January 2018, with an original launch date of March 2019. However, the game was then while it was being fine tuned, eventually .
It's free to play on Android and iOS, but the Sensor Tower data -- reported earlier Monday by The Hollywood Reporter -- shows Mario Kart Tour generating $37.4 million of in-game revenue since its release.
Mario Kart Tour is Nintendo's most successful mobile game release in terms of downloads -- it's trailed by Super Mario Run's 21.8 million -- but is second to Fire Emblem Heroes' revenue, which raked in $67.6 million in its first month, according to Sensor Tower.
Nintendo didn't immediately respond to a request for comment.