Mario Kart World was in development for Switch 1, started in 2017

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While it was a bit of a bummer that we didn't get an all new (mainline) Mario Kart on Switch, (it's one of the only real downsides of what's overall an amazing console) I am kinda glad we're getting the full fledged experience the developers envisioned rather than a compromised version held back by the current Switch.