diff --git a/01 - JavaScript Drum Kit/index-START.html b/01 - JavaScript Drum Kit/index-START.html
index 4070d32767..5d6734590a 100644
--- a/01 - JavaScript Drum Kit/index-START.html	
+++ b/01 - JavaScript Drum Kit/index-START.html	
@@ -58,6 +58,26 @@
   <audio data-key="76" src="sounds/tink.wav"></audio>
 
 <script>
+  document.addEventListener('keyup', (event) => {
+    var audio = document.querySelector(`audio[data-key='${event.keyCode}']`);
+    if (!audio) return;
+
+    var key = document.querySelector(`.key[data-key='${event.keyCode}']`);
+    key.classList.add('playing');
+
+    audio.currentTime = 0;
+    audio.play();
+
+  });
+
+    function removeTransition(event) {
+      if (event.propertyName !== 'transform') return;
+      this.classList.remove('playing');
+    };
+
+    var 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..98198c4e3c 100644
--- a/02 - JS + CSS Clock/index-START.html	
+++ b/02 - JS + CSS Clock/index-START.html	
@@ -60,13 +60,48 @@
       height:6px;
       background:black;
       position: absolute;
-      top:50%;
+      top: 50%;
+      transform-origin: 100%;
+      transform:rotate(90deg);
+      transition: all 0.05s;
+      transition-timing-function: cubic-bezier(0.9, 0.43, 0, 0.96);
+    }
+
+    .hour-hand {
+      width: 25%;
+      top: 50%;
+      left: 25%;
+    }
+
+    .min-hand {
+      width: 40%;
+      left: 10%;
     }
 
   </style>
 
   <script>
+    var secondHand = document.querySelector('.second-hand');
+    var minuteHand = document.querySelector('.min-hand');
+    var hourHand = document.querySelector('.hour-hand');
+
+    function setDate() {
+      var now = new Date();
+
+      var seconds = now.getSeconds();
+      var minutes = now.getMinutes();
+      var hours = now.getHours();
+
+      var secondsDegrees = ((seconds / 60) * 360) + 90;
+      var minutesDegrees = ((minutes / 60) * 360) + 90;
+      var hoursDegrees = ((hours / 60) * 360) + 90;
+
+      secondHand.style.transform = `rotate(${secondsDegrees}deg)`;
+      minuteHand.style.transform = `rotate(${minutesDegrees}deg)`;
+      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 ca2b59d077..028db6cd90 100644
--- a/03 - CSS Variables/index-START.html	
+++ b/03 - CSS Variables/index-START.html	
@@ -22,6 +22,22 @@ <h2>Update CSS Variables with <span class='hl'>JS</span></h2>
 
   <style>
 
+    :root {
+      --base: #ffc600;
+      --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 +64,15 @@ <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>
diff --git a/04 - Array Cardio Day 1/index-START.html b/04 - Array Cardio Day 1/index-START.html
index eec0ffc31d..5bc393e67a 100644
--- a/04 - Array Cardio Day 1/index-START.html	
+++ b/04 - Array Cardio Day 1/index-START.html	
@@ -27,33 +27,83 @@
       { first: 'Hanna', last: 'Hammarström', year: 1829, passed: 1909 }
     ];
 
-    const people = ['Beck, Glenn', 'Becker, Carl', 'Beckett, Samuel', 'Beddoes, Mick', 'Beecher, Henry', 'Beethoven, Ludwig', 'Begin, Menachem', 'Belloc, Hilaire', 'Bellow, Saul', 'Benchley, Robert', 'Benenson, Peter', 'Ben-Gurion, David', 'Benjamin, Walter', 'Benn, Tony', 'Bennington, Chester', 'Benson, Leana', 'Bent, Silas', 'Bentsen, Lloyd', 'Berger, Ric', 'Bergman, Ingmar', 'Berio, Luciano', 'Berle, Milton', 'Berlin, Irving', 'Berne, Eric', 'Bernhard, Sandra', 'Berra, Yogi', 'Berry, Halle', 'Berry, Wendell', 'Bethea, Erin', 'Bevan, Aneurin', 'Bevel, Ken', 'Biden, Joseph', 'Bierce, Ambrose', 'Biko, Steve', 'Billings, Josh', 'Biondo, Frank', 'Birrell, Augustine', 'Black, Elk', 'Blair, Robert', 'Blair, Tony', 'Blake, William'];
+    const people = ['Beck, Glenn', 'Becker, Carl', 'Beckett, Samuel', 'Beddoes, Mick', 'Beecher, Henry', 'Beethoven, Ludwig', 'Begin, Menachem', 'Belloc, Hilaire', 'Bellow, Saul', 'Benchley, Robert', 'Benenson, Peter', 'Ben-Gurion, David', 'Benjamin, Walter', 'Benn, Tony', 'Bennington, Chester', 'Benson, Leana', 'Bent, Silas', 'Bentsen, Lloyd', 'Berger, Ric', 'Bergman, Ingmar', 'Berio, Luciano', 'Berle, Milton', 'Berlin, Irving', 'Berne, Eric', 'Bernhard, Sandra', 'Berra, Yogi', 'Berry, Halle', 'Berry, Wendell', 'Bethea, Erin', 'Bevan, Aneurin', 'Bevel, Ken', 'Biden, Joseph', 'Bierce, Ambrose', 'Biko, Steve', 'Billings, Josh', 'Biondo, Frank', 'Birrell, Augustine', 'Black Elk', 'Blair, Robert', 'Blair, Tony', 'Blake, William'];
 
     // Array.prototype.filter()
     // 1. Filter the list of inventors for those who were born in the 1500's
+    function isBorn(inventor) {
+      return (inventor.year >= 1500 && inventor.year < 1600);
+    }
+    var born = inventors.filter(isBorn);
+    console.table(born);
 
     // Array.prototype.map()
     // 2. Give us an array of the inventors' first and last names
+    var names = inventors.map(inventor => {
+      return (inventor.first + ' ' + inventor.last);
+    })
+    console.log('names: ' + names);
 
     // Array.prototype.sort()
     // 3. Sort the inventors by birthdate, oldest to youngest
+    inventors.sort(function (a, b) {
+      return a.year - b.year;
+    });
+    console.log(inventors);
 
     // Array.prototype.reduce()
     // 4. How many years did all the inventors live?
+    var yearsLived = inventors.reduce(function (total, inventor) {
+      return total + (inventor.passed - inventor.year);
+    }, 0);
+
+    console.log(yearsLived);
 
     // 5. Sort the inventors by years lived
+    var sortedYears = inventors.sort(function (a, b) {
+      var aYears = (a.passed - a.year);
+      var bYears = (b.passed - b.year);
+      return aYears - bYears;
+    });
 
     // 6. create a list of Boulevards in Paris that contain 'de' anywhere in the name
     // https://en.wikipedia.org/wiki/Category:Boulevards_in_Paris
+    var blvds = ['Boulevard Auguste-Blanqui', 'Boulevard Barbès',
+      'Boulevard Beaumarchais', 'Boulevard de l\'Amiral-Bruix',
+      'Boulevard de Strasbourg', 'Boulevard des Capucines',
+      'Boulevard de la Chapelle', 'Boulevard de Clichy', 'Boulevard du Crime',
+      'Boulevard Haussmann', 'Boulevard des Italiens', 'Boulevard de la Madeleine',
+      'Boulevard de Magenta', 'Boulevard Montmartre', 'Boulevard du Montparnasse',
+      'Boulevard Raspail', 'Boulevard Richard-Lenoir', 'Boulevard de Rochechouart',
+      'Boulevard Saint-Germain', 'Boulevard Saint-Michel', 'Boulevard de Sébastopol',
+      'Boulevard du Temple', 'Boulevard Voltaire', 'Boulevard de la Zone'
+     ];
 
+     var de = blvds.filter(function(blvd) {
+       return blvd.match(/de/);
+     })
+     console.log('de: ' + de);
 
     // 7. sort Exercise
     // Sort the people alphabetically by last name
+    var sorted = people.sort(function(a, b) {
+      var [aLast, aFirst] = a.split(', ');
+      var [bLast, bFirst] = b.split(', ');
+      return aLast > bLast ? 1 : -1;
+    });
+    console.log(sorted);
 
     // 8. Reduce Exercise
     // Sum up the instances of each of these
     const data = ['car', 'car', 'truck', 'truck', 'bike', 'walk', 'car', 'van', 'bike', 'walk', 'car', 'van', 'car', 'truck' ];
-
+    var enumData = {};
+    data.forEach(function(item) {
+      if (enumData[item]) {
+        enumData[item] += 1;
+      } else {
+        enumData[item] = 1;
+      };
+    });
   </script>
 </body>
 </html>
diff --git a/05 - Flex Panel Gallery/index-START.html b/05 - Flex Panel Gallery/index-START.html
index e1d643ad5c..ba1b444385 100644
--- a/05 - Flex Panel Gallery/index-START.html	
+++ b/05 - Flex Panel Gallery/index-START.html	
@@ -24,6 +24,7 @@
     .panels {
       min-height:100vh;
       overflow: hidden;
+      display: flex;
     }
 
     .panel {
@@ -41,6 +42,11 @@
       font-size: 20px;
       background-size:cover;
       background-position:center;
+      flex: 1;
+      justify-content: center;
+      align-items: center;
+      display: flex;
+      flex-direction: column;
     }
 
 
@@ -54,6 +60,10 @@
       margin:0;
       width: 100%;
       transition:transform 0.5s;
+      flex: 1 0 auto;
+      display: flex;
+      justify-content: center;
+      align-items: center;
     }
 
     .panel p {
@@ -62,12 +72,30 @@
       text-shadow:0 0 4px rgba(0, 0, 0, 0.72), 0 0 14px rgba(0, 0, 0, 0.45);
       font-size: 2em;
     }
+
+    .panel > *:first-child {
+      transform: translateY(-100%);
+    }
+
+    .panel.open-active > *:first-child {
+      transform: translateY(0);
+    }
+
+    .panel > *:last-child {
+      transform: translateY(100%);
+    }
+
+    .panel.open-active > *:last-child {
+      transform: translateY(0);
+    }
+
     .panel p:nth-child(2) {
       font-size: 4em;
     }
 
     .panel.open {
       font-size:40px;
+      flex: 5;
     }
 
     .cta {
@@ -107,9 +135,21 @@
   </div>
 
   <script>
+    const panels = document.querySelectorAll('.panel');
 
-  </script>
+    function toggleOpen() {
+      this.classList.toggle('open');
+    }
 
+    function  toggleActive(event) {
+      if (event.propertyName.includes('flex')) {
+        this.classList.toggle('open-active');
+      }
+    }
+
+    panels.forEach(panel => panel.addEventListener('click', toggleOpen));
+    panels.forEach(panel => panel.addEventListener('transitionend', toggleActive));
+  </script>
 
 
 </body>
diff --git a/06 - Type Ahead/index-START.html b/06 - Type Ahead/index-START.html
index 1436886918..99bcb7ce36 100644
--- a/06 - Type Ahead/index-START.html	
+++ b/06 - Type Ahead/index-START.html	
@@ -15,7 +15,43 @@
     </ul>
   </form>
 <script>
-const endpoint = 'https://gist.githubusercontent.com/Miserlou/c5cd8364bf9b2420bb29/raw/2bf258763cdddd704f8ffd3ea9a3e81d25e2c6f6/cities.json';
+  const endpoint = 'https://gist.githubusercontent.com/Miserlou/c5cd8364bf9b2420bb29/raw/2bf258763cdddd704f8ffd3ea9a3e81d25e2c6f6/cities.json';
+  const cities = [];
+
+  fetch(endpoint)
+    .then(blob => blob.json())
+    .then(data => {
+      cities.push(...data)
+    })
+
+    const search = document.querySelector('.search');
+    const suggestions = document.querySelector('.suggestions');
+
+    function findMatches(word, cities) {
+      return cities.filter(place => {
+        const regex = new RegExp(word, 'gi');
+        return place.city.match(regex);
+      })
+    }
+
+    function displayMatches() {
+      const matchArray = findMatches(this.value, cities);
+      const html = matchArray.map(place => {
+        const regex = new RegExp(this.value, 'gi');
+        const cityName = place.city.replace(regex, `<span class="hl">${this.value}</span>`);
+        const stateName = place.state.replace(regex, `<span class="hl">${this.value}</span>`);
+        return `
+          <li>
+            <span class="name">${place.city}, ${place.state}</span>
+            <span class="population">${place.population}</span>
+          </li>
+        `
+      }).join('');
+      suggestions.innerHTML = html;
+    }
+
+    search.addEventListener('change', displayMatches);
+    search.addEventListener('keyup', displayMatches);
 
 </script>
   </body>
diff --git a/07 - Array Cardio Day 2/index-START.html b/07 - Array Cardio Day 2/index-START.html
index 969566ff78..0f580655b8 100644
--- a/07 - Array Cardio Day 2/index-START.html	
+++ b/07 - Array Cardio Day 2/index-START.html	
@@ -25,16 +25,26 @@
     ];
 
     // Some and Every Checks
-    // Array.prototype.some() // is at least one person 19 or older?
-    // Array.prototype.every() // is everyone 19 or older?
+    // Array.prototype.some() // is at least one person 19?
+    const year = new Date().getFullYear();
+    const year19 = year - 19;
+    console.log('At least one person 19: ' + people.some(person => person.year < year19));
 
     // Array.prototype.find()
     // Find is like filter, but instead returns just the one you are looking for
     // find the comment with the ID of 823423
+    var commentText = comments.filter(comment => comment.id === 823423);
+    console.table(commentText);
 
     // Array.prototype.findIndex()
     // Find the comment with this ID
+    var commentTextIndex = comments.findIndex(comment => comment.id === 823423);
     // delete the comment with the ID of 823423
+    var newComments = [
+      ...comments.slice(0, commentTextIndex),
+      ...comments.slice(commentTextIndex + 1)
+    ]
+    console.table(newComments);
 
   </script>
 </body>
diff --git a/08 - Fun with HTML5 Canvas/index-START.html b/08 - Fun with HTML5 Canvas/index-START.html
index 37c148df07..436245aef0 100644
--- a/08 - Fun with HTML5 Canvas/index-START.html	
+++ b/08 - Fun with HTML5 Canvas/index-START.html	
@@ -5,14 +5,64 @@
   <title>HTML5 Canvas</title>
 </head>
 <body>
-<canvas id="draw" width="800" height="800"></canvas>
+  <canvas id="draw" width="800" height="800"></canvas>
 <script>
+  const canvas = document.querySelector('#draw');
+  const ctx = canvas.getContext('2d');
+  canvas.width = window.innerWidth;
+  canvas.height = window.innerHeight;
+  ctx.strokeStyle = '#BADA55';
+  ctx.lineJoin = 'round';
+  ctx.lineCap = 'round';
+
+  let isDrawing = false;
+  let lastX = 0;
+  let lastY = 0;
+  let hue = 0;
+  let direction = true;
+
+  function draw(event) {
+    if (!isDrawing) return;
+    console.log(event);
+    ctx.strokeStyle = `hsl(${hue}, 100%, 50%)`;
+    ctx.beginPath();
+    ctx.moveTo(lastX, lastY);
+    ctx.lineTo(event.offsetX, event.offsetY);
+    ctx.stroke();
+    [lastX, lastY] = [event.offsetX, event.offsetY];
+    hue+=10;
+
+    if (hue >= 360) {
+      hue = 0;
+    };
+    if (ctx.lineWidth >= 100 || ctx.lineWidth <= 1) {
+      direction = !direction;
+    }
+    if (direction) {
+      ctx.lineWidth += 1;
+    } else {
+      ctx.lineWidth -= 1;
+    }
+  }
+
+  canvas.addEventListener('mousedown', (event) => {
+    isDrawing = true;
+    [lastX, lastY] = [event.offsetX, event.offsetY];
+  });
+
+  canvas.addEventListener('mousemove', draw);
+
+  canvas.addEventListener('mouseup', () => isDrawing = false);
+  canvas.addEventListener('mouseout', () => isDrawing = false);
 </script>
 
 <style>
   html, body {
     margin:0;
   }
+  #draw {
+    border: 1px solid black;
+  }
 </style>
 
 </body>
diff --git a/09 - Dev Tools Domination/index-START.html b/09 - Dev Tools Domination/index-START.html
index 196fffd719..c28c7e3311 100644
--- a/09 - Dev Tools Domination/index-START.html	
+++ b/09 - Dev Tools Domination/index-START.html	
@@ -18,28 +18,56 @@
     }
 
     // Regular
+    console.log('Hello world');
 
     // Interpolated
+    console.log('Hello %s', '🌐');
 
     // Styled
+    console.log('%c Code is stylish', 'color: red, background: blue');
 
     // warning!
+    console.warn('you shouldn\'t be doing this');
 
     // Error :|
+    console.error('Oh noes');
 
     // Info
+    console.info('This is informative');
 
     // Testing
+    console.assert('1' === 1, 'not equal!');
 
     // clearing
+    //console.clear();
 
     // Viewing DOM Elements
+    const p = document.querySelector('p');
+    console.dir(p);
 
     // Grouping together
+    dogs.forEach(dog => {
+      console.group(`${dog.name}`);
+        console.log(`This is ${dog.name}`);
+        console.log(`${dog.name} is ${dog.age} years old`);
+      console.groupEnd();
+    })
 
     // counting
+    console.count('Loki');
+    console.count('Loki');
+    console.count('Keebler');
+    console.count('Loki');
+    console.count('Loki');
 
     // timing
+    console.time('Fetching Data');
+    fetch('https://api.github.com/users/zivi')
+      .then(data => data.json)
+      .then(data => {
+        console.timeEnd('fetching data');
+        console.log(data);
+      })
 
   </script>
 </body>
diff --git a/10 - Hold Shift and Check Checkboxes/index-START-zivis-solution.html b/10 - Hold Shift and Check Checkboxes/index-START-zivis-solution.html
new file mode 100644
index 0000000000..d17b25310e
--- /dev/null
+++ b/10 - Hold Shift and Check Checkboxes/index-START-zivis-solution.html	
@@ -0,0 +1,139 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <title>Document</title>
+</head>
+<body>
+  <style>
+
+    html {
+      font-family: sans-serif;
+      background:#ffc600;
+    }
+
+    .inbox {
+      max-width:400px;
+      margin:50px auto;
+      background:white;
+      border-radius:5px;
+      box-shadow:10px 10px 0 rgba(0,0,0,0.1);
+    }
+
+    .item {
+      display:flex;
+      align-items:center;
+      border-bottom: 1px solid #F1F1F1;
+    }
+
+    .item:last-child {
+      border-bottom:0;
+    }
+
+
+    input:checked + p {
+      background:#F9F9F9;
+      text-decoration: line-through;
+    }
+
+    input[type="checkbox"] {
+      margin:20px;
+    }
+
+    p {
+      margin:0;
+      padding:20px;
+      transition:background 0.2s;
+      flex:1;
+      font-family:'helvetica neue';
+      font-size: 20px;
+      font-weight: 200;
+      border-left: 1px solid #D1E2FF;
+    }
+
+    .details {
+      text-align: center;
+      font-size: 15px;
+    }
+
+
+  </style>
+   <!--
+   The following is a common layout you would see in an email client.
+
+   When a user clicks a checkbox, holds Shift, and then clicks another checkbox a few rows down, all the checkboxes inbetween those two checkboxes should be checked.
+
+  -->
+  <div class="inbox">
+    <div class="item">
+      <input type="checkbox" data-index="0">
+      <p>This is an inbox layout.</p>
+    </div>
+    <div class="item">
+      <input type="checkbox" data-index="1">
+      <p>Check one item</p>
+    </div>
+    <div class="item">
+      <input type="checkbox" data-index="2">
+      <p>Hold down your Shift key</p>
+    </div>
+    <div class="item">
+      <input type="checkbox" data-index="3">
+      <p>Check a lower item</p>
+    </div>
+    <div class="item">
+      <input type="checkbox" data-index="4">
+      <p>Everything inbetween should also be set to checked</p>
+    </div>
+    <div class="item">
+      <input type="checkbox" data-index="5">
+      <p>Try do it with out any libraries</p>
+    </div>
+    <div class="item">
+      <input type="checkbox" data-index="6">
+      <p>Just regular JavaScript</p>
+    </div>
+    <div class="item">
+      <input type="checkbox" data-index="7">
+      <p>Good Luck!</p>
+    </div>
+    <div class="item">
+      <input type="checkbox" data-index="8">
+      <p>Don't forget to tweet your result!</p>
+    </div>
+  </div>
+
+<script>
+  const inbox = document.querySelector('.inbox');
+  let startingChild = null;
+  let endingChild = null;
+
+  inbox.addEventListener('click', (event) => {
+    if (event.target.type !='checkbox') return;
+
+    if (event.shiftKey) {
+      endingChild = parseInt(event.target.dataset.index);
+      // check the other boxes if there's a startingChild
+      if (startingChild != null) {
+        // increment if startingChild < endingChild
+        if (startingChild < endingChild) {
+          let inputs = document.querySelectorAll('input');
+          for (let i = startingChild; i < endingChild; i += 1) {
+            let el = document.querySelector(`[data-index="${i}"]`);
+            el.checked = true;
+          };
+        } else {
+          for (let i = endingChild + 1; i < startingChild; i += 1) {
+            let el = document.querySelector(`[data-index="${i}"]`);
+            el.checked = true;
+          };
+        };
+      };
+    } else {
+      startingChild = parseInt(event.target.dataset.index);
+    };
+  })
+
+</script>
+</body>
+</html>
diff --git a/11 - Custom Video Player/index.html b/11 - Custom Video Player/index.html
index 281a15eaa8..4977b53c6b 100644
--- a/11 - Custom Video Player/index.html	
+++ b/11 - Custom Video Player/index.html	
@@ -15,7 +15,7 @@
         <div class="progress__filled"></div>
        </div>
        <button class="player__button toggle" title="Toggle Play">►</button>
-       <input type="range" name="volume" class="player__slider" min="0" max="1" step="0.05" value="1">
+       <input type="range" name="volume" class="player__slider" min="0" max="1" step="0.05" value="0.5">
        <input type="range" name="playbackRate" class="player__slider" min="0.5" max="2" step="0.1" value="1">
        <button data-skip="-10" class="player__button">« 10s</button>
        <button data-skip="25" class="player__button">25s »</button>
diff --git a/11 - Custom Video Player/scripts.js b/11 - Custom Video Player/scripts.js
index e69de29bb2..0bb38d2a49 100644
--- a/11 - Custom Video Player/scripts.js	
+++ b/11 - Custom Video Player/scripts.js	
@@ -0,0 +1,53 @@
+const videoPlayer = document.getElementsByTagName('video')[0];
+const progress = document.querySelector('.progress');
+const progressFilled = document.querySelector('.progress__filled');
+const play = document.querySelector('.toggle');
+const skipButtons = document.querySelectorAll('[data-skip]');
+const volume = document.getElementsByName('volume')[0];
+const playbackRate = document.getElementsByName('playbackRate')[0];
+var playProgressRate = null;
+var unPlayed = true;
+var progressStatus = 0;
+
+videoPlayer.addEventListener('timeupdate', updateStatusBar);
+progress.addEventListener('click', scrub);
+
+videoPlayer.volume = 0.5
+volume.onmousemove = () => {
+  videoPlayer.volume = volume.value;
+}
+
+playbackRate.onmousemove = () => {
+  videoPlayer.playbackRate = playbackRate.value;
+}
+
+play.onclick = () => {
+  if (videoPlayer.paused) {
+    videoPlayer.play();
+    videoPlayer.paused = false;
+    play.textContent = '❚❚';
+    unPlayed = false;
+  } else {
+    videoPlayer.pause();
+    videoPlayer.paused = true;
+    play.textContent = '►';
+  }
+}
+
+function updateStatusBar() {
+  const percent = (videoPlayer.currentTime / videoPlayer.duration) * 100;
+  progressFilled.style.flexBasis = `${percent}%`;
+}
+
+function scrub(event) {
+  var scrubTime = (event.offsetX / progress.offsetWidth) * videoPlayer.duration;
+  videoPlayer.currentTime = scrubTime;
+}
+
+skipButtons.forEach(button => button.addEventListener('click', skip));
+var skip = () => {
+  let skiptime = parseFloat(this.dataset.skip);
+  videoPlayer.currentTime += skiptime;
+  progressStatus += (playProgressRate * skiptime);
+  progressFilled.style.flexBasis = `${progressStatus}%`;
+}
diff --git a/11 - Custom Video Player/style.css b/11 - Custom Video Player/style.css
index c07581c1c0..b6253af905 100644
--- a/11 - Custom Video Player/style.css	
+++ b/11 - Custom Video Player/style.css	
@@ -89,7 +89,7 @@ body {
   width:50%;
   background:#ffc600;
   flex:0;
-  flex-basis:50%;
+  flex-basis:0%;
 }
 
 /* unholy css to style input type="range" */
diff --git a/12 - Key Sequence Detection/index-START.html b/12 - Key Sequence Detection/index-START.html
index 8cab786140..ce964e48c9 100644
--- a/12 - Key Sequence Detection/index-START.html	
+++ b/12 - Key Sequence Detection/index-START.html	
@@ -7,6 +7,16 @@
 </head>
 <body>
 <script>
+  var pressed = [];
+  const secretCode = 'superfly';
+  window.addEventListener('keyup', (event) => {
+    pressed.push(event.key);
+    pressed.splice(-secretCode.length - 1, pressed.length - secretCode.length);
+    if (pressed.join('') === secretCode) {
+      console.log('match!');
+      cornify_add();
+    }
+  });
 </script>
 </body>
 </html>
diff --git a/13 - Slide in on Scroll/index-START.html b/13 - Slide in on Scroll/index-START.html
index 0b9fb8fccb..1db2ac8ad0 100644
--- a/13 - Slide in on Scroll/index-START.html	
+++ b/13 - Slide in on Scroll/index-START.html	
@@ -58,6 +58,24 @@ <h1>Slide in on Scroll</h1>
       };
     }
 
+    const sliderImages = document.querySelectorAll('.slide-in');
+
+    function checkSlide(event) {
+      sliderImages.forEach(function(sliderImage) {
+        const slideInAt = (window.scrollY + window.innerHeight) - (sliderImage.height / 2);
+        const imageBottom = sliderImage.offsetTop + sliderImage.height;
+        const isHalfShown = slideInAt > sliderImage.offsetTop;
+        const isNotScrolledPast = window.scrollY < imageBottom;
+        if (isHalfShown && isNotScrolledPast) {
+          sliderImage.classList.add('active');
+        } else {
+          sliderImage.classList.remove('active');
+        }
+      })
+    }
+
+    window.addEventListener('scroll', debounce(checkSlide));
+
   </script>
 
   <style>