Club Nintendo

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G2ThaUNiT said:

Solid choice for a developer!

CONFIRMED: Mario & Luigi Brothership was co-developed by Acquire (Octopath Traveler, Tenchu, Way of the Samurai) pic.twitter.com/MNZvtqdcPE

— Nintendeal (@Nintendeal) October 21, 2024

Apparently it's also an Unreal Engine game:

https://www.gonintendo.com/contents/41795-mario-luigi-brothership-uses-unreal-engine

A lot of these collabs with external studios (this, Pikmin 4, Yoshi's Crafted World) seem to be taking this route, probably for the sake of developer familiarity. It's easier to just use UE than teach devs how to use Nintendo's in-house technology.