Bowser’s Fury can apparently be played right away in Super Mario 3D World on Switch
As the title implies, Super Mario 3D World + Bowser’s Fury has two adventures to complete. You can platform your way through the original Wii U levels or access the entirely new experience featuring Fury Bowser.
Nintendo has now indicated that players can select the original Super Mario 3D World or the new Bowser’s Fury adventure at any point. You’ll simply choose between them on the title screen. Based on this, it sounds like you won’t have to finish the main campaign to unlock Bowser’s Fury.
Super Mario 3D World + Bowser’s Fury launches for Switch on February 12.