diff --git a/01 - JavaScript Drum Kit/index-START.html b/01 - JavaScript Drum Kit/index-START.html
index 4070d32767..08d6c5198f 100644
--- a/01 - JavaScript Drum Kit/index-START.html	
+++ b/01 - JavaScript Drum Kit/index-START.html	
@@ -59,6 +59,24 @@
 
 <script>
 
+function playSound(event) {
+  const audio = document.querySelector(`audio[data-key="${event.keyCode}"]`);
+  const key = document.querySelector(`key[data-key="${event.keyCode}"]`);
+  if (!audio) return;
+  audio.currentTime = 0;
+  audio.play();
+  key.classList.add('playing');
+}
+
+function removeTransition(event) {
+  if (event.propertyName !== 'transition') return;
+  this.classList.remove('playing');
+}
+const keys = document.querySelectorAll('.key');
+keys.forEach(key => key.addEventListener('transitionend', removeTransition));
+
+window.addEventListener('keydown', playSound);
+
 </script>
 
 
diff --git a/02 - JS and CSS Clock/index-START.html b/02 - JS and CSS Clock/index-START.html
index 7a6d27d5bd..dad1b7c7dc 100644
--- a/02 - JS and CSS Clock/index-START.html	
+++ b/02 - JS and CSS Clock/index-START.html	
@@ -62,12 +62,35 @@
       background: black;
       position: absolute;
       top: 50%;
+      transform-origin: 100%;
+      transform: rotate(90deg);
+      transition: all 0.05s ease-in-out;
+      transition-timing-function: cubic-bezier(0, 2.6, 0.58, 1);
     }
 
   </style>
 
   <script>
+const secondHand = document.querySelector('.second-hand');
+const minHand = 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(${secondsDegrees}deg`;
+
+  const mins = now.getMinutes();
+  const minsDegrees = (( mins / 60 ) * 360) + 90;
+  minHand.style.transform = `rotate(${minsDegrees}deg`;
+
+  const hours = now.getHours();
+  const hoursDegrees = (( hours / 60 ) * 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 6b9b539c09..39bee594e8 100644
--- a/03 - CSS Variables/index-START.html	
+++ b/03 - CSS Variables/index-START.html	
@@ -22,6 +22,23 @@ <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
 
   <style>
 
+:root {
+  --base: #ffc600;
+  --spacing: 50px;
+  --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
     */
@@ -45,6 +62,16 @@ <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>