id="difficultyFilter">
    <a-entity id="difficultyButton"
      mixin="bigMenuTopButton"
      material="opacity: 0"
      bind__visible-raycastable="mainMenuActive"
      animation__opacity="property: components.material.material.uniforms.opacity.value; from: 0; to: 1; dur: 1000; delay: 300; startEvents: startgame"
      play-sound__hover="event: mouseenter; sound: #hoverSound; volume: 0.1"
      proxy-event="event: click; to: a-scene; as: difficultyfiltermenuopen">
      <a-entity mixin="bigMenuTopButton