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QuoteAccording to a prominent Nintendo insider, Mario Kart X is the next Mario Kart game, which seemingly confirms rumblings that Mario Kart: Home Circuit is viewed internally by Nintendo as Mario Kart 9. Adding to this, the new report about the next Mario Kart game claims it will be a soft-reboot and lean into crossovers. And this is where the name "Mario Kart X" comes into play. Not only is "X" the roman numeral of 10 but it's also meant to represent crossover. And the next Mario Kart game is reportedly going big on the crossovers...
https://comicbook.com/gaming/news/mario-kart-x-nintendo-switch-leaked/