Since "New Super Mario Bros. Wii" is a Nintendo Wii game, it requires specific motion controls (shaking the controller to spin/float) that need to be mapped correctly to an Xbox controller for a smooth experience.
Here is the friction point. New Super Mario Bros. Wii expects a Wii Remote turned sideways. That remote has: dolphin new super mario bros wii xbox controller
After mapping, type a name like "NSMB_Xbox" in the Profile box and click Save. This ensures you don't have to reconfigure the controls next time you play. Since "New Super Mario Bros
XInput/0/Gamepad or similar. If you are using an Xbox One or Series controller via USB/Bluetooth, it should appear here automatically.Enable Sideways Mode: Under the General and Options tab, check the box for Sideways Wii Remote. Map Motion Simulation: Navigate to the Motion Simulation tab. At the top right, click the Device dropdown
, which is much more reliable than physically shaking a controller. Recommended Xbox Button Mapping
Dolphin Settings for Better Performance: For a smoother gaming experience, you might need to tweak Dolphin’s settings, such as enabling dual core, setting the video backend to Direct3D or OpenGL (depending on your graphics card), and adjusting the frame skipping or HLE (high-level emulation) settings.