diff --git a/01 - JavaScript Drum Kit/index-START.html b/01 - JavaScript Drum Kit/index-START.html
index 4070d32767..53e0c32fa6 100644
--- a/01 - JavaScript Drum Kit/index-START.html	
+++ b/01 - JavaScript Drum Kit/index-START.html	
@@ -58,7 +58,23 @@
   <audio data-key="76" src="sounds/tink.wav"></audio>
 
 <script>
+  window.addEventListener('keydown', function(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');
+
+  });
+  function removeTransition(e){
+    if(e.propertyName !== 'transform') return;
+    this.classList.remove('playing');
+  }
+
+  const keys= document.querySelectorAll('.key');
+  keys.forEach(key => key.addEventListener('transitionend', removeTransition));
 </script>
 
 
diff --git a/02 - JS + CSS Clock/index-START.html b/02 - JS + CSS Clock/index-START.html
index 2712384201..c98b4568ae 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 now = new Date();
+
+    const seconds = now.getSeconds()
+    const secondsDegrees = ((seconds / 60) * 360) + 90;
+    secondHand.style.transform = `rotate(${secondsDegrees}deg)`;
+
+    const minutes = now.getMinutes()
+    const minutesDegrees = ((minutes / 60) * 360) + 90;
+    minuteHand.style.transform = `rotate(${minutesDegrees}deg)`;
+
+    const hours = now.getHours()
+    const hoursDegrees = ((hours / 12) * 360) + 90;
+    hourHand.style.transform = `rotate(${hoursDegrees}deg)`;
+  }
+  setInterval(setDate, 1000)
 
   </script>
 </body>
diff --git a/03 - CSS Variables/index-START.html b/03 - CSS Variables/index-START.html
index 7171607a8b..0259b652a2 100644
--- a/03 - CSS Variables/index-START.html	
+++ b/03 - CSS Variables/index-START.html	
@@ -21,7 +21,20 @@ <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
   <img src="https://source.unsplash.com/7bwQXzbF6KE/800x500">
 
   <style>
+      :root {
+        --base: red;
+        --spacing: 10px;
+        --blur :10px;
+      }
 
+    img {
+      padding: var(--spacing);
+      background: var(--base);
+      filter: blur(var(--blur));
+    }  
+
+    .hl {
+      color: var(--base);    }
     /*
       misc styles, nothing to do with CSS variables
     */
@@ -48,6 +61,16 @@ <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
   </style>
 
   <script>
+    const inputs = document.querySelectorAll('.controls input');
+
+    function handleUpdate(){
+      const suffix = this.dataset.sizing || '';
+      document.documentElement.style.setProperty(`--${this.name}`, this.value + suffix)
+    }
+
+    inputs.forEach(input => input.addEventListener('change', handleUpdate));
+    inputs.forEach(input => input.addEventListener('mousemove', handleUpdate));
+
   </script>
 
 </body>