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Development on Mario Kart World started as far back as when Mario Kart 8 Deluxe was just wrapping up production, and official work started at the end of 2017 as a title for the original Nintendo Switch. From the very beginning, the game started off as an open-world experience, which is why the game is called Mario Kart World instead of Mario Kart 9. Because of this, having 24 racers in a single game rather than 12, like in 8 Deluxe, was already in consideration.
Technical limitations of the original Nintendo Switch console made development very difficult, and the team shifted to the then-upcoming Nintendo Switch 2 in 2020. In the meantime, the team released the Mario Kart 8 Deluxe Booster Course Pass to fill the void while Nintendo was still working on Mario Kart World.
Because of this delay, Mario Kart World has the longest gap of any mainline Mario Kart game that exists thus far, spanning almost six years from Mario Kart Tour (not counting Mario Kart Live: Home Circuit, or 8 Deluxe). The longest ever gap prior to this was the gap between Mario Kart 64 and Mario Kart: Super Circuit, which spanned almost five years.
Technical limitations of the original Nintendo Switch console made development very difficult, and the team shifted to the then-upcoming Nintendo Switch 2 in 2020. In the meantime, the team released the Mario Kart 8 Deluxe Booster Course Pass to fill the void while Nintendo was still working on Mario Kart World.
Because of this delay, Mario Kart World has the longest gap of any mainline Mario Kart game that exists thus far, spanning almost six years from Mario Kart Tour (not counting Mario Kart Live: Home Circuit, or 8 Deluxe). The longest ever gap prior to this was the gap between Mario Kart 64 and Mario Kart: Super Circuit, which spanned almost five years.
Comments (3)

Reply to comment by CuriousUserX90 posted Jun 3, 2025, 11:40 AM
Whatever the truth is in terms of the MK8BP's existence, I think the decision to do those particular sorts of 7 tracks in Mario Kart Tour were made around the same time, basically with them being made to be Switch tracks, although one of them got left out for official reasons still to be explained. Plus without the MK8BP, how else would we have seen things such as all 3 variants of each real world city track being put together? So I'm sure it was always the plan to bring Mario Kart Tour over to one of Nintendo's own systems, something they could even do with another Mario Kart game for mobile devices as well.

I'm pretty sure Mario Kart Tour is a main Mario Kart game and the 9th one whole, it's been confirmed for sometime, something that after people didn't believe it was further proven with the Mario Kart 8 Booster Pack featuring tracks introduced in that game, and anything in it like characters and items and retro tracks featured for the first time in it count as having been used in the series: https://www.deviantart.com/smash-universe/journal/Mario-Kart-Tour-News-814414626 and https://www.nintendo.co.jp/character/mario/collection/search.html#?g=series&v=mariokart
Even future Smash Bros. games having stuff from Mario Kart Tour such as music can prove it, along with what mentions and acknowledges Mario Kart Tour in the years to come (like again characters like Pauline, Hammer Bro., Monty Mole, Nabbit and Chargin Chuck aren't listed as first timers to the series in Mario Kart World). Mario Kart World is the 11th Mario Kart game whole, so of course there's been something between it and Mario Kart 8.
Even future Smash Bros. games having stuff from Mario Kart Tour such as music can prove it, along with what mentions and acknowledges Mario Kart Tour in the years to come (like again characters like Pauline, Hammer Bro., Monty Mole, Nabbit and Chargin Chuck aren't listed as first timers to the series in Mario Kart World). Mario Kart World is the 11th Mario Kart game whole, so of course there's been something between it and Mario Kart 8.

I still like to believe that it was always the plan for Mario Kart Tour content to be brought to Nintendo's own system, which it was in the form of the Mario Kart 8 Booster Pack. I would also like to believe that Diddy Kong and Kamek as other characters who could've been in Mario Kart 8 on the Wii U if not for time constraints were intended to be DLC in the Switch port somewhere down the line, after not being in the base game due to the decision with making the different genders of Villager and Inkling be separate slots
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