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Hello! There is no proper ui component in Superpowers. But you can manage to do it like so:

let camera = Sup.getActor("Camera").camera;
let mousePosition = Sup.Input.getMousePosition();
let ray = new Sup.Math.Ray().setFromCamera(camera, mousePosition);
let result = ray.intersectActor(Sup.getActor("Button"));
if (result.length > 0) {
  // Hovering the button

  if (Sup.Input.wasMouseButtonJustPressed(0)) {
    // Just clicked on the button
  }

} else {
  // Not hovering the button
}

Hope it helps!