diff --git a/01 - JavaScript Drum Kit/index-START.html b/01 - JavaScript Drum Kit/index-START.html
index 4070d32767..cfbcb827d1 100644
--- a/01 - JavaScript Drum Kit/index-START.html	
+++ b/01 - JavaScript Drum Kit/index-START.html	
@@ -58,7 +58,21 @@
   <audio data-key="76" src="sounds/tink.wav"></audio>
 
 <script>
+	const keys = document.querySelectorAll('.key');
+	// Remove playing class from key after transition has ended.
+	keys.forEach(key => key.addEventListener('transitionend', function(e) {
+		this.classList.remove('playing');
+	}));
 
+	// Listens for keystrokes and querys the corresponding button and audio.
+	window.addEventListener("keydown", function(e) {
+		var audio = document.querySelector(`audio[data-key="${e.keyCode}"]`);
+		if (!audio) return;
+		var key = document.querySelector(`.key[data-key="${e.keyCode}"]`);
+		key.classList.add('playing')
+		audio.currentTime = 0; //Does not work in Safari
+		audio.play();
+	})
 </script>
 
 
diff --git a/02 - JS + CSS Clock/index-START.html b/02 - JS + CSS Clock/index-START.html
index 2712384201..8b6d958782 100644
--- a/02 - JS + CSS Clock/index-START.html	
+++ b/02 - JS + CSS Clock/index-START.html	
@@ -61,12 +61,31 @@
       background:black;
       position: absolute;
       top:50%;
+	  transform: rotate(90deg);
+	  transition-timing-function: ease-in-out;
+	  transform-origin: 100%;
+	  transition-duration: 0.1s;
     }
 
   </style>
 
   <script>
+  	const secondHand = document.querySelector(`.second-hand`);
+	const minuteHand = document.querySelector(`.min-hand`);
+	const hourHand = document.querySelector(`.hour-hand`);
+	function time() {
+		var date = new Date();
+		var seconds = 90 + date.getSeconds()*6
+		secondHand.style.transform = `rotate(${seconds}deg)`;
 
+		var minutes = 90 + date.getMinutes()*6
+		minuteHand.style.transform = `rotate(${minutes}deg)`;
+
+		var hours = 90 + date.getHours()*30
+		hourHand.style.transform = `rotate(${hours}deg)`;
+	}
+
+	setInterval(time, 1000);
 
   </script>
 </body>
diff --git a/03 - CSS Variables/index-START.html b/03 - CSS Variables/index-START.html
index bf0f33e3ba..3cd2398607 100644
--- a/03 - CSS Variables/index-START.html	
+++ b/03 - CSS Variables/index-START.html	
@@ -22,6 +22,21 @@ <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
 
   <style>
 
+	:root {
+		--base: yellow;
+		--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
     */
@@ -53,6 +68,13 @@ <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
   </style>
 
   <script>
+	function change() {
+		var suffix = this.dataset.sizing || '';
+		document.documentElement.style.setProperty(`--${this.name}`, (this.value+suffix));
+	}
+
+  	const inputs = document.querySelectorAll(`.controls input`);
+	inputs.forEach(input => input.addEventListener('input', change));
   </script>
 
 </body>