diff --git a/01 - JavaScript Drum Kit/index-START.html b/01 - JavaScript Drum Kit/index-START.html
index 4070d32767..de7fac4e68 100644
--- a/01 - JavaScript Drum Kit/index-START.html	
+++ b/01 - JavaScript Drum Kit/index-START.html	
@@ -58,9 +58,24 @@
   <audio data-key="76" src="sounds/tink.wav"></audio>
 
 <script>
+  window.addEventListener('keydown', function(e) {
+    const audio = document.querySelector(`audio[data-key="${e.keyCode}"]`);
+    if (!audio) return;
+    audio.currentTime = 0; // rewind to start
+    audio.play();
 
-</script>
-
+    const key = document.querySelector(`.key[data-key="${e.keyCode}"]`);
+    key.classList.add('playing');
+  })
 
+  // attaching all the events at the start
+  const keys = document.querySelectorAll('.key');
+  keys.forEach((key) => {
+    key.addEventListener('transitionend', function(e){
+      if(e.propertyName !== 'transform') return;
+      key.classList.remove('playing');
+    })
+  })
+</script>
 </body>
 </html>
diff --git a/02 - JS + CSS Clock/index-START.html b/02 - JS + CSS Clock/index-START.html
index 259280d228..012f78e43e 100644
--- a/02 - JS + CSS Clock/index-START.html	
+++ b/02 - JS + CSS Clock/index-START.html	
@@ -61,12 +61,35 @@
       background:black;
       position: absolute;
       top:50%;
+      transform-origin: 100%;
+      transform: rotate(90deg);
+      transition: all 0.05s;
+      transition-timing-function: cubic-bezier(0.1, 2.7, 0.58, 1);
     }
 
   </style>
 
   <script>
+    const secondHand = document.querySelector('.second-hand');
+    const minuteHand = document.querySelector('.min-hand');
+    const hourHand = document.querySelector('.hour-hand');
 
+    function setDate() {
+      const date = new Date();
+      const seconds = date.getSeconds();
+      const minutes = date.getMinutes();
+      const hours = date.getHours();
+
+      const secondsDegree = ((seconds / 60) * 360) + 90;
+      const minutesDegree = ((minutes / 60) * 360) + 90;
+      const hoursDegree = ((hours / 12) * 360) + 90;
+
+      secondHand.style.transform = `rotate(${secondsDegree}deg)`;
+      minuteHand.style.transform = `rotate(${minutesDegree}deg)`;
+      hourHand.style.transform = `rotate(${hoursDegree}deg)`;
+    }
+
+    window.setInterval(setDate, 1000);
 
   </script>
 </body>
diff --git a/03 - CSS Variables/index-START.html b/03 - CSS Variables/index-START.html
index bf0f33e3ba..6457da721b 100644
--- a/03 - CSS Variables/index-START.html	
+++ b/03 - CSS Variables/index-START.html	
@@ -22,9 +22,17 @@ <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
 
   <style>
 
-    /*
-      misc styles, nothing to do with CSS variables
-    */
+    :root {
+      --base: #ffc600;
+      --spacing: 10px;
+      --blur: 10px;
+    }
+
+    img {
+      padding: var(--spacing);
+      background: var(--base);
+      filter: blur(var(--blur));
+    }
 
     body {
       text-align: center;
@@ -53,6 +61,14 @@ <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
   </style>
 
   <script>
+    const controls = document.querySelectorAll('.controls input');
+
+    const handleUpdate = (e) => {
+      const suffix = e.target.dataset.sizing || '';
+      document.documentElement.style.setProperty(`--${e.target.name}`, e.target.value + suffix);
+    }
+    controls.forEach(control => control.addEventListener('change', handleUpdate));
+    // controls.forEach(control => control.addEventListener('mousemove', handleUpdate));
   </script>
 
 </body>