diff --git a/01 - JavaScript Drum Kit/index-START.html b/01 - JavaScript Drum Kit/index-START.html
index 4070d32767..e8ecc905ec 100644
--- a/01 - JavaScript Drum Kit/index-START.html	
+++ b/01 - JavaScript Drum Kit/index-START.html	
@@ -59,6 +59,29 @@
 
 <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();
+  console.log(key);
+  key.classList.add('playing');
+}
+
+function removeTransition(e) {
+  if (e.propertyName !== 'transform') return;
+  console.log(e.propertyName)
+  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 + CSS Clock/index-START.html b/02 - JS + CSS Clock/index-START.html
index 2712384201..306ee17cab 100644
--- a/02 - JS + CSS Clock/index-START.html	
+++ b/02 - JS + CSS Clock/index-START.html	
@@ -14,7 +14,8 @@
         <div class="hand second-hand"></div>
       </div>
     </div>
-
+   <label for="">Rate</label>
+   <input type="opti">
 
   <style>
     html {
@@ -61,12 +62,33 @@
       background:black;
       position: absolute;
       top:50%;
+      transform-origin: 100%;
+      transform: rotate(90deg);
+      transform: all 0.05s;
+      transition-timing-function: cubic-bezier(0.1, 2.7 .58, 1);
     }
 
   </style>
-
   <script>
 
+    const hrHand = document.querySelector('.hour-hand')
+    const minHand = document.querySelector('.min-hand')
+    const secHand = document.querySelector('.second-hand')
+
+    const setDate = ()=>{
+      const now = new Date();
+      const hours = now.getHours();
+      const minutes = now.getMinutes();
+      const seconds = now.getSeconds();
+      const hrDegree = (hours / 12) * 360 + 90;
+      const minDegree = (minutes / 60) * 360 + 90;
+      const secDegree = (seconds / 60) * 360 + 90;
+      hrHand.style.transform = `rotate(${hrDegree}deg)`
+      minHand.style.transform = `rotate(${minDegree}deg)`
+      secHand.style.transform = `rotate(${secDegree}deg)`
+    }
+
+    setInterval(setDate, 1000)
 
   </script>
 </body>
diff --git a/03 - CSS Variables/index-START.html b/03 - CSS Variables/index-START.html
index bf0f33e3ba..d3f14f7e7b 100644
--- a/03 - CSS Variables/index-START.html	
+++ b/03 - CSS Variables/index-START.html	
@@ -25,6 +25,21 @@ <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
     /*
       misc styles, nothing to do with CSS variables
     */
+    :root {
+      --base: #ffc600;
+      --padding: 10px;
+      --blur: 10px;
+    }
+
+    img {
+      background: var(--base);
+      padding: var(--padding);
+      filter: blur(var(--blur));
+    }
+
+    h1 {
+      color: var(--base);
+    }
 
     body {
       text-align: center;
@@ -53,6 +68,19 @@ <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 || '';
+    console.log(suffix);
+    document.documentElement.style.setProperty(`--${this.name}`, this.value + suffix);
+  }
+
+  inputs.forEach(input=>{
+    input.addEventListener('change', handleUpdate);
+    input.addEventListener('mousemove', handleUpdate);
+  })
+
   </script>
 
 </body>