diff --git a/01 - JavaScript Drum Kit/index-FINISHED.html b/01 - JavaScript Drum Kit/index-FINISHED.html
deleted file mode 100644
index ae9aacaf07..0000000000
--- a/01 - JavaScript Drum Kit/index-FINISHED.html	
+++ /dev/null
@@ -1,84 +0,0 @@
-<!DOCTYPE html>
-<html lang="en">
-<head>
-  <meta charset="UTF-8">
-  <title>JS Drum Kit</title>
-  <link rel="stylesheet" href="style.css">
-  <link rel="icon" href="https://fav.farm/✅" />
-</head>
-<body>
-
-
-  <div class="keys">
-    <div data-key="65" class="key">
-      <kbd>A</kbd>
-      <span class="sound">clap</span>
-    </div>
-    <div data-key="83" class="key">
-      <kbd>S</kbd>
-      <span class="sound">hihat</span>
-    </div>
-    <div data-key="68" class="key">
-      <kbd>D</kbd>
-      <span class="sound">kick</span>
-    </div>
-    <div data-key="70" class="key">
-      <kbd>F</kbd>
-      <span class="sound">openhat</span>
-    </div>
-    <div data-key="71" class="key">
-      <kbd>G</kbd>
-      <span class="sound">boom</span>
-    </div>
-    <div data-key="72" class="key">
-      <kbd>H</kbd>
-      <span class="sound">ride</span>
-    </div>
-    <div data-key="74" class="key">
-      <kbd>J</kbd>
-      <span class="sound">snare</span>
-    </div>
-    <div data-key="75" class="key">
-      <kbd>K</kbd>
-      <span class="sound">tom</span>
-    </div>
-    <div data-key="76" class="key">
-      <kbd>L</kbd>
-      <span class="sound">tink</span>
-    </div>
-  </div>
-
-  <audio data-key="65" src="sounds/clap.wav"></audio>
-  <audio data-key="83" src="sounds/hihat.wav"></audio>
-  <audio data-key="68" src="sounds/kick.wav"></audio>
-  <audio data-key="70" src="sounds/openhat.wav"></audio>
-  <audio data-key="71" src="sounds/boom.wav"></audio>
-  <audio data-key="72" src="sounds/ride.wav"></audio>
-  <audio data-key="74" src="sounds/snare.wav"></audio>
-  <audio data-key="75" src="sounds/tom.wav"></audio>
-  <audio data-key="76" src="sounds/tink.wav"></audio>
-
-<script>
-  function removeTransition(e) {
-    if (e.propertyName !== 'transform') return;
-    e.target.classList.remove('playing');
-  }
-
-  function playSound(e) {
-    const audio = document.querySelector(`audio[data-key="${e.keyCode}"]`);
-    const key = document.querySelector(`div[data-key="${e.keyCode}"]`);
-    if (!audio) return;
-
-    key.classList.add('playing');
-    audio.currentTime = 0;
-    audio.play();
-  }
-
-  const keys = Array.from(document.querySelectorAll('.key'));
-  keys.forEach(key => key.addEventListener('transitionend', removeTransition));
-  window.addEventListener('keydown', playSound);
-</script>
-
-
-</body>
-</html>
diff --git a/01 - JavaScript Drum Kit/index-START.html b/01 - JavaScript Drum Kit/index-START.html
index 8a2f8e8417..a98dbdcfcd 100644
--- a/01 - JavaScript Drum Kit/index-START.html	
+++ b/01 - JavaScript Drum Kit/index-START.html	
@@ -60,8 +60,27 @@
 
 <script>
 
+function playSound(e) {
+    const audio = document.querySelector(`audio[data-key="${e.keyCode}"]`)
+    const key = document.querySelector(`.key[data-key="${e.keyCode}"]`)
+
+    if (!audio) return;
+    
+    audio.currentTime = 0;
+    audio.play();
+
+    key.classList.add('playing');
+
+    setTimeout((
+      () => {
+        key.classList.remove('playing');
+      }
+    ), 100)
+  }
+
+  window.addEventListener('keydown', playSound);
 </script>
 
 
 </body>
-</html>
+</html>
\ No newline at end of file
