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Posting on Twitter, Monolith said it had assisted with the design of characters and courses for the Switch 2 game.
Monolith, which is fully owned by Nintendo, has previously contributed to many first-party games, including the Splatoon, Animal Crossing, and Zelda series.
For the past 15 years, Monolith Soft has mainly been focused on development of the Xenoblade Chronicles series, though it was also responsible for the two Project X Zone crossover RPGs on the 3DS.
Mario Kart World is out today, alongside the Nintendo Switch 2 console. It's available as a standalone release, and as part of a bundle with the console.

Xenoblade studio reveals it co-developed Switch 2’s big launch game | VGC
Monolith created characters and stages for Mario Kart World…
