Bowser's Fury is a 2021 platform game developed and published by Nintendo for the Nintendo Switch. It is an original 3D platform entry in the Super Mario series and a spin-off title that derives mechanically from Super Mario 3D World (2013). The game's story involves Mario helping Bowser Jr. on a series of cat-themed islands surrounding Lake Lapcat, which are being terrorized by an enhanced form of Bowser called Fury Bowser, having been transformed by mysterious black sludge that has also enveloped the various island regions.