Mario & Luigi: Brothership[a] is a role-playing video game developed by Acquire and published by Nintendo for the Nintendo Switch. It is the sixth main installment in the Mario & Luigi series. It is the first original entry in the series since Mario & Luigi: Paper Jam (2015), the first that is not developed by AlphaDream after its closure due to bankruptcy in October 2019, the first that features fully 3D gameplay, and the first for a home console.[b] The game was announced in a Nintendo Direct on June 18, 2024, and released on November 7, 2024.