you have an error in your code

equality in JS https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Strict_equality

and 'rangeValue' should be a variable -> value from slider

function play() {
  if ('rangeValue' === 76) { // missing `===`
     audio.play();
  } else {
     window.location.replace("https://example.com/");
  }
}

Fixed a few things in the code, a couple of which could have been from forgetting to copy the bottom couple of lines 😉.

<div id="Slider">
        <span id="rangeValue">0</span>
        <Input class="range" type="range" name "" value="0" min="0" max="100" onChange="rangeSlide(this.value)" onmousemove="rangeSlide(this.value)"></Input>
    </div>
    <script type="text/javascript">
        function rangeSlide(value) {
          document.getElementById('rangeValue').innerHTML = value;
        }
    </script>
<button class="btn-1" id="i22w3" onclick="play()">Continue</button>

<script>
 function play() {
   const rangeValue = document.getElementById('rangeValue').textContent;
   if (rangeValue === "76") {
     console.log('play sound')
   } else {
     console.log('replace')
   }
 }
</script>

Test it here

What I did:

• Close the script tag and closure in the bottom (probably due to how it was copied)
• Declare and set a value to rangeValue in play() because right now it's just a string: 'rangeValue'.
• Change the if statement test from = to ===

That's it, just replace my console logs with what you want and re-add the elements I deleted and it should work.