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HTML 

              
                <!-- Art based on https://www.instagram.com/p/BsvHvCsnegd/ -->

<div class="screen">
  <div class="cloud cloud--2"></div>
  <div class="cloud cloud--1"></div> 
  <div class="js-opening opening-screen">
    <img src="https://gilleskurt.com/thefearsomethree/ostitle.png" alt="" class="opening-screen__title">
    <img src="https://gilleskurt.com/thefearsomethree/osfigures.png" alt="" class="opening-screen__figures">
    <button class="js-start opening-screen__start-button"></button>
    <div class="js-message message-box message-box--full is-hidden">
      <p>Looks like you've got some real guts, partner. I reckon you might just be tough enough to be the new sheriff in town. Don’t go provin’ me wrong now!<button type="button" class="js-continue continue-button">Continue...</button></p>
    </div>
  </div>
  <div class="js-play is-hidden">
    <div class="js-sheriff sheriff"></div>
    <div class="js-opponent opponent opponent--1"></div>
    <div class="message-box message-box--half">
      <button type="button" class="js-draw shoot-button is-hidden">Shoot!</button>
      <span class="js-result"></span>
      <span class="js-message"></span>
      <button type="button" class="js-result-continue continue-button is-hidden">Continue...</button>
      <button type="button" class="js-duel continue-button is-hidden">Continue...</button>
    </div>
  </div>
  <div class="js-outro is-hidden">
    <div class="message-box message-box--full">
      <span>Dang, you're quick on the draw! You'll make one tough, no-nonsense sheriff!</span>
      <span class="js-total-time"></span>
      <button type="button" class="js-save-and-quit continue-button">Save and Quit...</button>
    </div>
  </div>
</div>
!

CSS 

              
                * {
  box-sizing: border-box;
  font-family: 'VT323', monospace!important;
  font-size: 21px!important;
  margin: 0;
  padding: 0;
}

$dimensionXY: 500px;
$small: 7px;
$medium: 15px;
$large: 30px;
$xlarge: 60px;
$yellow: #F59600;

$opponent1: 0;
$opponent2: -206px;
$opponent3: -412px;
$sheriff: -618px;

$standing: 0;
$armed: -206px;
$shooting: -412px;
$dead: -618px;

body {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
}

.screen {
  background-image: url("https://gilleskurt.com/thefearsomethree/bgprops.png"),  url("https://gilleskurt.com/thefearsomethree/bg.png");
  height: $dimensionXY;
  overflow: hidden;
  position: relative;
  width: $dimensionXY;
}

@keyframes cloudToRight {
  to {
    transform: translateX(700px);
  }
}

.cloud {
  background-image: url("https://gilleskurt.com/thefearsomethree/clouds.png");
  height: 200px;
  position: absolute;
  width: 200px;
}

.cloud--1 {
  animation: cloudToRight 120s linear infinite;
  transform: translateX(-110px);
}

.cloud--2 {
  animation: cloudToRight 200s 10s linear infinite;
  transform: translateX(-200px);
  background-position-x: 250px;
}

@keyframes blink {
  0%, 30% {
    opacity: 0;
  }
  
  32%, 100% {
    opacity: 1;
  }
}
@mixin button {
  background-color: transparent;
  border: 0;
  color: $yellow;
  
  &:hover {
    cursor: pointer;
  }
}

.opening-screen {}

.opening-screen__start-button {
  @include button;
  animation: blink 1.5s 3.5s linear infinite;
  background-image: url("https://gilleskurt.com/thefearsomethree/press-start.png"); 
  height: $dimensionXY;
  opacity: 0;
  width: $dimensionXY;
}

@keyframes topDownFadeIn {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.opening-screen__title {
  animation: topDownFadeIn 1.5s 1s ease forwards;
  opacity: 0;
  position: absolute;
  transform: translateY(-20%);
}

.opening-screen__figures {
  animation: topDownFadeIn 2s 1s ease forwards;
  opacity: 0;
  position: absolute;
  transform: translateY(-5%);
}

@keyframes moveUp {
  to {
    transform: translateY(-5%);
  }
}

.has-message {
  .opening-screen__figures,
  .opening-screen__title {
    animation: moveUp 0.4s ease forwards;
    opacity: 1;
    transform: translateY(0);
  }
}

.continue-button {
  @include button;
  
  &::after {
    content: "";
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
  }
}

.game-over,
.game-end{
  
  .message-box {
    background-color: transparent;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-direction: column;
    bottom: 50%;
    left: 50%;
    text-align: center;
    transform: translate(-50%, 50%);
  }
}

.opening-screen {
  .message-box {
    transition: opacity 0.4s ease, transform 0.4s ease;
  }
}

.message-box {
  background-color: rgba(151, 106, 68, 0.9);
  border-radius: $small;
  padding: $medium;
  position: absolute;
  bottom: $small;
  transform: translateY(0);
  opacity: 1;
  
  &.is-hidden {
    opacity: 0;
    transform: translateY(20%);
  }
}

.message-box--full {
  left: 7px;
  width: calc(100% - 15px);
}

.message-box--half {
  right: 7px;
  width: calc(100% - 150px);
}

@keyframes moveIn {
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes goner {
  to {
    opacity: 1;
    transform: rotate(-30deg) translate(-100%);
  }
}

.sheriff {
  animation: moveIn 1s ease forwards;
  background-image: url("https://gilleskurt.com/thefearsomethree/character-spritesheet.png");
  background-position-x: $standing;
  background-position-y: $sheriff;
  height: 200px;
  opacity: 0;
  position: absolute;
  left: 0;
  bottom: 0;
  width: 200px;
  transform: translateX(-10%);
  z-index: 2;
  
  &.is-armed {
    background-position-x: $armed;
  }
  
  &.is-dead {
    background-position-x: $dead;
  }
  
  &.is-gone {
    transform: translateX(0);
    animation: goner 1s ease forwards;
  }
  
  &.is-shooting {
    background-position-x: $shooting;
  }
}

.opponent {
  animation: moveIn 1s ease forwards;
  background-image: url("https://gilleskurt.com/thefearsomethree/character-spritesheet.png");
  background-position-x: $standing;
  height: 200px;
  opacity: 0;
  position: absolute;
  right: 100px;
  bottom: 70px;
  width: 200px;
  transform: translateX(10%);
  
  &.is-armed {
    background-position-x: $armed;
  }
  
  &.is-dead {
    background-position-x: $dead;
  }
  
  &.is-shooting {
    background-position-x: $shooting;
  }
}

.opponent--1 {
  background-position-y: $opponent1;
}

.opponent--2 {
  background-position-y: $opponent2;
}

.opponent--3 {
  background-position-y: $opponent3;
}

.is-hidden {
  display: none;
}

.shoot-button {
  @include button;
  text-align: center;
  width: 100%;
  
  &::after {
    content: "";
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
  }
}
!

JS 

              
                $ ->
  $document = $ (document)
  @$body = $document.find "body"  
    
# opening screen -----------------------------
  @$openingScreen = $document.find ".js-opening"
  @$playScreen = $document.find ".js-play"
  
  @$startButtonOS = @$openingScreen.find ".js-start"
  @$messageOS = @$openingScreen.find ".js-message"
  
  startButtonOS = =>
    @$startButtonOS.addClass "is-hidden"
    @$messageOS.removeClass "is-hidden"
    @$openingScreen.addClass "has-message"
  @$startButtonOS.on "click", => startButtonOS()
  
  @$continueButtonOS = @$openingScreen.find ".js-continue"
  @$continueButtonOS.on "click", =>
    @$openingScreen.addClass "is-hidden"
    @$playScreen.removeClass "is-hidden"
    @$openingScreen.removeClass "has-message"
    showDuelInfo()
 
# play screen -----------------------------  
  
  @$messagePS = @$playScreen.find ".js-message"
  @$duelButton = $document.find ".js-duel"
  @$drawButton = $document.find ".js-draw"
  @$sheriff = $document.find ".js-sheriff"
  @$opponent = $document.find ".js-opponent"
  @$resultPS = $document.find ".js-result"
  @result
  @$timer
  @dueling = false
  @level = 1
  @gameOver = false
  @noHonor = 1
  @totalTime = 0
  
  restart = =>
    # completely restarts game
    @level = 1
    @noHonor = 0
    @dueling = false
    @gameOver = false
    @totalTime = 0
    resetMessages()
    @$outroScreen.addClass "is-hidden"
    @$playScreen.addClass "is-hidden"
    @$openingScreen.removeClass "is-hidden"
    @$startButtonOS.removeClass "is-hidden"
    @$messageOS.addClass "is-hidden"
    @$body.removeClass "game-over"
    @$body.removeClass "game-end"
    @$sheriff.removeClass "is-dead"
    @$sheriff.removeClass "is-gone"
    
  death = =>
    @totalTime = 0
    @$opponent.addClass "is-shooting"
    @$sheriff.addClass "is-dead"
    setTimeout (=>
      @$sheriff.addClass "is-gone"
      @$opponent.removeClass "is-shooting"
      @$resultPS.html "Game Over"
      @$duelButton.removeClass "is-hidden"
      @level = 1
      @gameOver = true
      @$body.addClass "game-over"
      return
    ), 200
   
  win = =>
    @totalTime = @totalTime + @result
    @$sheriff.addClass "is-shooting"
    @$opponent.addClass "is-dead"
    @$resultPS.html("Law and order served up hot in " + @result.toFixed(3) + " seconds")
    @level++
    @$resultContinue.removeClass "is-hidden"
    setTimeout (=>
      @$sheriff.removeClass "is-shooting"
      @$sheriff.addClass "is-armed"
      return
    ), 200
    setTimeout (=>
      @$sheriff.removeClass "is-armed"
      return
    ), 1000
    
  @$resultContinue = $document.find ".js-result-continue"
  @$resultContinue .on "click", =>
    @$resultContinue.addClass "is-hidden"
    resetMessages()
    # if won the game
    if @level == 4
      enterOutro()
    # continue as normal
    else
      showDuelInfo()
  
  reset = =>
    # stops game if no reaction
    death()
    clearInterval @$timer
    @$duelButton.removeClass "is-hidden"
    @$drawButton.addClass "is-hidden"
    
  showDuelInfo = =>
    @$opponent.removeClass "is-armed"
    @$opponent.removeClass "is-dead"
    @$opponent.removeClass "opponent--1"
    @$opponent.removeClass "opponent--2"
    @$opponent.removeClass "opponent--3"
    @$opponent.addClass "opponent--" + @level
    switch @level
      when 3
        @$messagePS.html "Big Gilly Boulder? He’s the fastest draw this side of the desert, and he’s itchin’ to prove it."
      when 2
        @$messagePS.html "Goldie Gaia runs the saloon, and she ain’t afraid to send you to Boot Hill if you step outta line."
      else
        @$messagePS.html "Pumpgun Ed ain't someone to mess with. This big fella could flatten you faster than a tumbleweed in a twister."
    @$duelButton.removeClass "is-hidden"
    
  resetMessages = =>
    @$messagePS.html ""
    @$resultPS.html ""   
    
  enterDuelMode = =>
    @$duelButton.addClass "is-hidden"
    @$drawButton.removeClass "is-hidden"
    resetMessages()
    @delay = (Math.floor(Math.random()*(6 -1)+1)) * 1000

    # start duel
    @$duel = setTimeout ( =>
      @dueling = true
      # style start
      @$opponent.addClass "is-armed"

      # start timer
      startTime = Date.now()
      @$timer = setInterval((=>
        elapsedTime = Date.now() - startTime
        # announce result
        @result = (elapsedTime / 1000)
        if @result > 2
          reset()
        return
      ), 10)
    ), @delay
    
    
  noHonor = =>
    # if clicked to early
    clearInterval @$duel
    @$duelButton.removeClass "is-hidden"
    @$drawButton.addClass "is-hidden"
    switch @noHonor
      when 1
        noHonorMessage = "Wait for your opponent to draw first. No shootin’ early, or you’ll get called a no-good cheater."
        @noHonor++
      when 2
        noHonorMessage = "Click “Shoot!” as soon as they make their move. The faster, the better!"
        @noHonor++
      else
        random = Math.floor(Math.random() * (4 - 1) ) + 1;
        switch random
          when 1
            noHonorMessage = "Jumpin’ the gun won’t win ya respect, just a bad reputation. Try again!"
          when 2
            noHonorMessage = "Draw too early? That’s dishonorable, partner! Try again."
          else
            noHonorMessage = "Hold your horses! You gotta let ‘em draw first, or it ain't a real duel."   
    @$resultPS.html noHonorMessage     
   
  # Duel button
  @$duelButton.on "click", =>
    if @gameOver
      restart()
    else
      enterDuelMode()

# Draw button
  @$drawButton.on "click", =>
    if @dueling
      # good draw
      clearInterval @$timer
      @$opponent.removeClass "is-armed"
      @$drawButton.addClass "is-hidden"
      switch @level
        when 3
          if @result < 0.33
            win()
          else
            death()
        when 2
          if @result < 0.4
            win()
          else
            death()
        else
          if @result < 2
            win()
          else
            death()
    else
      # failed draw
      noHonor()
    @dueling = false
    
# Outro screen -----------------------------  
  @$outroScreen = $document.find ".js-outro"
  @$saveAndQuitButton = @$outroScreen.find ".js-save-and-quit"
  @$totalTime = @$outroScreen.find ".js-total-time"
  enterOutro = =>
    @$totalTime.html "Total time: " + @totalTime.toFixed(3) + "seconds"
    @$playScreen.addClass "is-hidden"
    @$outroScreen.removeClass "is-hidden"
    @$body.addClass "game-end"
    @$totalTime = 0
    
  @$saveAndQuitButton .on "click", =>
    restart()
!
999px

Console