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HTML

              
                <div class="play-area">
  
  <div class="court court-left">
    <div class="wall gone" id="wall-left">
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
    </div>
    <div class="score gone" id="score-left">0</div>
    <div class="paddle gone" id="paddle-left"></div>
  </div>
  <div class="court court-right">
    <div class="score gone" id="score-right">0</div>
    <div class="wall gone" id="wall-right">
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
      <span>🔥</span>
    </div>
    <div class="paddle gone" id="paddle-right"></div>
  </div>
  
  <div class="ball"></div>
</div>
<button role="button" class="play-btn">PLAY</button>

<audio controls="controls" id="audio-hit">
  <source src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/1145795/pong_beeep.wav" type="audio/wav">
</audio>
<audio controls="controls" id="audio-miss">
  <source src="https://s3-us-west-2.amazonaws.com/s.cdpn.io/1145795/pong_peeeeeep.wav" type="audio/wav">
</audio>
              
            
!

CSS

              
                $dark: #333;
$darker: #1c1c1c;
$darkest: #000;
$light: #fff;

html { box-sizing: border-box; } *, *::before, *::after { box-sizing: inherit; }
html {
  height: 100vh;
}
body {
  font-family: 'Press Start 2P', cursive;
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: $darkest;
}
audio {
  display: none;
}
.play-area {
  background: $darker;
  position: relative;
  display: grid;
  grid-template-columns: 1fr 1fr;
  width: 700px;
  height: 600px;
}
.court {
  position: relative;
  text-align: center;
  display: grid;
}
.court-left {
  /* the left column is for when the ball is 'out' */
  padding-right: 2px;
  grid-template-columns: 30px 1fr;
  background-image: linear-gradient(to bottom, $light 50%, $darker 50%);
  background-position: right top;
  background-repeat: repeat-y;
  background-size: 2px 20px;
}
.court-right {
  /* the right column is for when the ball is 'out' */
  grid-template-columns: 1fr 30px;
}
.wall {
  background: $dark;
  width: 30px;
  display: flex;
  flex-direction: column;
  justify-content: space-around;
  align-items: stretch;
  padding: 5px 0;
  fonr-size: 20px;
  overflow: hidden;
  text-align: center;
}
.gone {
  pointer-events: none;
  opacity: 0;
}

.paddle, .ball {
  position: absolute;
}
.paddle {
  width: 30px;
  height: 80px;
  background: $light;
}
#paddle-left {
  left: 0;
}
#paddle-right {
  right: 0;
}

.score {
  background: $darker;
  color: $light;
  font-size: 40px;
  padding-top: 20px;
}

.play-btn {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  font-family: 'Press Start 2P', cursive;
  padding: 20px 40px;
  font-size: 25px;
  background: $darkest;
  color: $light;
  border: 2px solid $light;
  cursor: pointer;
  &:hover {
    background: $light;
    color: $darkest;
  }
}

 //This bit replaces the cursor with a base64 version of a 6x6px white square. I could have replaxced the cursor using a div via JS (in conjunction with cursor: none) but that could have created lag due to mousemove listener, this way seems snappier.
.play-area { 
  cursor: url('data:image/png;base64,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'), auto;
}
              
            
!

JS

              
                let leftsTurn = true;
let paddleSize = 70;
let difficulty = 0.1;
let score = 0;
const walls = document.querySelectorAll('.wall');
const paddles = document.querySelectorAll('.paddle');
const paddleLeft = document.getElementById('paddle-left');
const paddleRight = document.getElementById('paddle-right');
const wallLeft = document.getElementById('wall-left');
const wallRight = document.getElementById('wall-right');
const scoreLeft = document.getElementById('score-left');
const scoreRight = document.getElementById('score-right');
const playBtn = document.querySelector('.play-btn');
const audioHit = document.getElementById('audio-hit');
const audioMiss = document.getElementById('audio-miss');

function reset() {
  leftsTurn = true;
  paddleSize = 70;
  difficulty = 0.1;
  score = 0;
  scoreLeft.classList.remove('gone');
  scoreRight.classList.remove('gone');
  wallLeft.classList.add('gone');
  paddleLeft.classList.add('gone');
  wallRight.classList.remove('gone');
  paddleRight.classList.remove('gone');
  playBtn.style.display = 'none';
}

function gameOver() {

  audioMiss.play();
  wallRight.classList.add('gone');
  paddleRight.classList.add('gone');
  wallLeft.classList.add('gone');
  paddleLeft.classList.add('gone');


  if (score > 10) {
    playBtn.innerHTML = `🎉 ${score}pts 🎉`;
  } else {
    playBtn.innerHTML = '🙈🙈🙈'
  }

  playBtn.style.display = 'block';
  setTimeout(() => {
    playBtn.innerHTML = 'PLAY'
  }, 2000)
}

function switchTurns() {

  score++;

  leftsTurn = !leftsTurn;

  audioHit.play();

  if (leftsTurn) {
    wallLeft.classList.add('gone');
    paddleLeft.classList.add('gone');
    wallRight.classList.remove('gone');
    paddleRight.classList.remove('gone');
  } else {
    wallRight.classList.add('gone');
    paddleRight.classList.add('gone');
    wallLeft.classList.remove('gone');
    paddleLeft.classList.remove('gone');
  }

  if (score > 20) {
    difficulty = 0.4;
  } else if (score > 10) {
    difficulty = 0.25;
    paddleSize = 50;
  } else if (score > 5) {
    difficulty = 0.15;
    paddleSize = 60;
  }

  $('.paddle').css('height', paddleSize);

}

movePaddles();

playBtn.addEventListener('click', () =>{
  reset();
});

Array.from(paddles).forEach(function(paddle) {
  paddle.addEventListener('mouseenter', function(e) {
    switchTurns();
  })
});

Array.from(walls).forEach(function(wall) {
  wall.addEventListener('mouseenter', function(e) {
    if (leftsTurn) {
      scoreRight.innerHTML = parseFloat(scoreRight.innerHTML) + 1
    } else {
      scoreLeft.innerHTML = parseFloat(scoreLeft.innerHTML) + 1
    }
    gameOver();
  })
});

function newPosition(){
  var h = $('.play-area').height() - paddleSize;
  var nh = Math.floor(Math.random() * h);
  return [nh];  
}

function movePaddles(){
  var newPos = newPosition();
  var oldPos = $('.paddle').offset();
  var speed = calcSpeed([oldPos.top], newPos);

  //this is basically the only reason I've included jQuery...
  $('.paddle').animate({ top: newPos[0] }, speed, function(){
    movePaddles();        
  });
};

function calcSpeed(prev, next) {
  var y = Math.abs(prev[0] - next[0]);
  var speed = Math.ceil(y/difficulty);
  return speed;
}
              
            
!
999px

Console