* Jump Rope Challenge (summer 2020, released as a digital only game on the Nintendo eShop originally planned to be limited release, but staying up indefinitely for now)
* Fire Emblem Engage (January 2023, developed by Intelligent Systems, so considered more of a 2nd party game)
One more example that is 3rd party published but Nintendo owns copyright on:
* Cruis'n Blast (September 2021, a port of an arcade game developed by Raw Thrills, who both developed and published this port)
One more example but using the Unreal Engine:
* Yoshi's Crafted World (March 2019, developed by Good Feel)
Despite the examples I listed, almost none of these games are ones developed by one of Nintendo's internal studios (Jump Rope Challenge being the exception, but it was never intended to be one of their big games), but instead are developed by another studio not fully controlled by Nintendo. For their big games developed by them, they still use their own bespoke, proprietary engines, which is likely a sign that Nintendo doesn't trust outside engines like Godot, Unity, and Unreal well enough to commit to using them for such games. Outside developers making games to be published by Nintendo apparently have more freedom to use their preferred engines, including the mentioned outside ones.