These are original games built by fans that use Mario assets.
Occasionally, fan projects port the full 3D N64 classic to HTML5, though these are often taken down quickly, so you have to keep an eye out for active mirrors. Mario Game Free Online
Sometimes Nintendo offers "Free-to-Start" games on the eShop (like Super Mario Run on mobile), where the first few levels are free to play. 2. How to Play (Basic Controls) These are original games built by fans that use Mario assets
A classic browser game where you can also create your own levels. Mario Game Free Online
Most modern browsers support USB or Bluetooth controllers (like an Xbox or PS5 controller). Emulation sites usually have a "Settings" or "Gamepad" icon where you can map your buttons for a much better feel.