Sure, here's an HTML code for a form with the specified options:

<form>
  <label for="volumeMusic">Music Volume:</label>
  <input type="range" name="volumeMusic" id="volumeMusic" min="0.0" max="1.0" step="0.1">

  <label for="volumeFX">FX Volume:</label>
  <input type="range" name="volumeFX" id="volumeFX" min="0.0" max="1.0" step="0.1">

  <label for="isFullscreen">Fullscreen:</label>
  <input type="checkbox" name="isFullscreen" id="isFullscreen">
</form>
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