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HTML

              
                <section class="wrapper" oncontextmenu="return false">

  <section class="mobile">
    <span class="line title">The maze</span>
    <span class="line">I'm very sorry but this game is for non-touch screen only</span>
  </section>

  <section class="instruction">
    <span class="line title">The maze</span>
    <span class="line">This is a pure CSS game</span>
    <span class="line">Use your mouse cursor to follow the line from the green mark to the end</span>
    <span class="line upper">** This game is not for touch screen ** - Sorry</span>
    <span class="line">Back to the <a href="https://codepen.io/chaofix/pen/VrWZga">pen</a></span>
    <span class="line">Other CSS games:</span>
    <span class="line">Air bomb <a href="https://s.codepen.io/chaofix/debug/oegBEJ" target="_blank">Got to pen</a></span>
    <span class="line">Save the eggs <a href="https://codepen.io/chaofix/debug/ZJLmrr" target="_blank">Go to pen</a></span>
  </section>

  <section class="game">
    <input type="checkbox" class="step" id="maze--1"/>
    <section class="maze maze--1">
      
      <section class="path path--1"></section>

      <section class="path path--finish"></section>

      <section class="path path--end"></section>

      <section class="finish">
        <span class="line">Good job</span>
        <span class="line">Le'ts see you on the <label for="maze--1">next level</label></span>
      </section>

      <section class="gameover">
        <span class="line">To finish this game, the mouse cursor should stay on the path</span>
        <span class="line">You lose!</span>
      </section>
    </section>

    <input type="checkbox" class="step" id="maze--2"/>
    <section class="maze maze--2">
      
      <section class="path path--1"></section>

      <section class="path path--2"></section>

      <section class="path path--3"></section>

      <section class="path path--4"></section>

      <section class="path path--5"></section>

      <section class="path path--finish"></section>

      <section class="path path--end"></section>

      <section class="finish">
        <span class="line">Good job</span>
        <span class="line">Le'ts see you on the <label for="maze--2">next level</label></span>
      </section>

      <section class="gameover">
        <span class="line">To finish this game, the mouse cursor should stay on the path</span>
        <span class="line">You lose!</span>
      </section>
    </section>

    <input type="checkbox" class="step" id="maze--3"/>
    <section class="maze maze--3">
      
      <section class="path path--1"></section>

      <section class="path path--2"></section>

      <section class="path path--3"></section>

      <section class="path path--4"></section>

      <section class="path path--5"></section>

      <section class="path path--6"></section>

      <section class="path path--7"></section>

      <section class="path path--finish"></section>

      <section class="path path--end"></section>

      <section class="finish">
        <span class="line">Good job</span>
        <span class="line">Le'ts see you on the <label for="maze--3">next level</label></span>
      </section>

      <section class="gameover">
        <span class="line">To finish this game, the mouse cursor should stay on the path</span>
        <span class="line">You lose!</span>
      </section>
    </section>

    <input type="checkbox" class="step" id="maze--4"/>
    <section class="maze maze--4">
      
      <section class="path path--1"></section>

      <section class="path path--2"></section>

      <section class="path path--3"></section>

      <section class="path path--4"></section>

      <section class="path path--5"></section>

      <section class="path path--finish"></section>

      <section class="path path--end"></section>

      <section class="finish">
        <span class="line">Good job</span>
        <span class="line">Le'ts see you on the <label for="maze--4">next level</label></span>
      </section>

      <section class="gameover">
        <span class="line">To finish this game, the mouse cursor should stay on the path</span>
        <span class="line">You lose!</span>
      </section>
    </section>

    <input type="checkbox" class="step" id="maze--5"/>
    <section class="maze maze--5">
      
      <section class="path path--1"></section>

      <section class="path path--2"></section>

      <section class="path path--3"></section>

      <section class="path path--4"></section>

      <section class="path path--5"></section>

      <section class="path path--finish"></section>

      <section class="finish">
        <span class="line">Good job</span>
        <span class="line">You made it till the end</span>
        <span class="line">Now, tweet about it so your friends will try also <a href="https://twitter.com/intent/tweet?text=Done!%20I%20just%20finished%20this%20awesome%20pure%20CSS%20game,%20let's%20see%20you%20now&url=http%3A%2F%2Fbit.ly%2F2zU4LFV&via=chaofix" target="_blank" class="tweet">Tweet</a></span>
      </section>

      <section class="gameover">
        <span class="line">To finish this game, the mouse cursor should stay on the path</span>
        <span class="line">You lose!</span>
      </section>
    </section>
  </section>

  <footer>
    <span class="author">Created by <a href="https://www.linkedin.com/in/itzikpop/">Itzik Pop</a></span>

    <span class="center">The Maze</span>

    <span class="opposite">Pure CSS Game | 100% JS free</span>
  </footer>
</section>
              
            
!

CSS

              
                @import url('https://fonts.googleapis.com/css?family=Source+Sans+Pro');

$game-area: 400px;
$maze__size--1: 5;
$maze__size--2: 10;
$maze__size--3: 20;
$maze__size--4: 25;
$maze__size--5: 40;
$maze__startpoint: 10px;

$anim-speed: 0.3s;

$empty: transparent;
$blue: rgb(18, 121, 142);
$green: rgb(55, 200, 123);
$red: rgb(208, 61, 60);
$white: rgb(255, 255, 255);
$black: darken($white, 100%);

$tweet: rgb(29, 161, 242); //#1da1f2

// Screen size
// --------------------------------------------------------------------------------
$screen-xs: 480px;
$screen-xs-min: $screen-xs;

$screen-sm: 768px;
$screen-sm-min: $screen-sm;

$screen-md: 992px;
$screen-md-min: $screen-md;

$screen-lg: 1200px;
$screen-lg-min: $screen-lg;

$screen-xs-max: ($screen-sm-min - 1);
$screen-sm-max: ($screen-md-min - 1);
$screen-md-max: ($screen-lg-min - 1);

@mixin size($height, $width) {
  height: $height;
  width: $width;
}

@mixin square($size) {
  @include size($size, $size);
}

* {
  background-repeat: no-repeat;
  box-sizing: border-box;
  outline: 0;
  user-select: none;

  &:before, &:after {
    background-repeat: no-repeat;
    box-sizing: border-box;  
    outline: 0;
  }
}

html, body, .wrapper {
  align-items: center;
  background-color: $blue;
  display: grid;
  font-family: 'Source Sans Pro', sans-serif;
  height: 100vh;
  justify-content: center;
  margin: 0;
  overflow: hidden;
  padding: 0;
  width: 100vw;
}

.wrapper {

  &:hover {

    .gameover {
      display: none;
    }
  }
}

@media (max-width: $screen-xs-max) {
  .mobile {
    display: grid;
    background-color: #fff;
    border: solid 1px $black;
    box-shadow: 0 0 15px 5px rgba($black, 0.5);
    flex-direction: column;
    left: 50%;
    max-width: 200px;
    padding: 20px;
    position: absolute;
    top: 50%;
    transform: translate(-50%, -50%);
  }

  .instruction,
  .game {
    display: none;
  }
}

@media (min-width: $screen-sm-min) {
  .mobile {
    display: none;
  }

  .instruction {
    display: flex;
  }

  .game {
    @include square($game-area);
    display: grid;
    left: 50%;
    position: absolute;
    top: 50%;
    transform: translate3d(-50%, -50%, 0);
  }

  .gameover {
    align-items: center;
    align-content: center;
    background-color: rgba($black, 0.7);
    color: $white;
    display: none;
    font-size: 24px;
    flex-wrap: wrap;
    height: 100%;
    justify-content: center;
    position: absolute;
    text-align: center;
    text-shadow: 1px 1px 2px $black;
    width: 100%;
    user-select: none;

    &:hover {
      display: flex;
    }

    .line {
      transform: perspective(100rem) rotateZ(45deg);
    }
  }

  .finish {
    align-items: center;
    align-content: center;
    background-color: $black;
    bottom: -120px;
    color: $white;
    cursor: default;
    display: flex;
    opacity: 0;
    font-size: 16px;
    flex-wrap: wrap;
    height: 120px;
    justify-content: center;
    position: absolute;
    pointer-events: none;
    text-align: center;
    width: 100%;
    z-index: 10;

    &:hover {
      display: flex;
      opacity: 1;
      pointer-events: all;

      & + .gameover {
        display: none !important;
      }
    }
  }

  .maze {
    @include square($game-area);
    background-color: $red;
    border: solid 1px $red;
    display: grid;
    left: 50%;
    opacity: 0;
    pointer-events: all;
    position: absolute;
    top: 50%;
    transform: perspective(100rem) translate3d(-50%, -50%, 0) rotateZ(-45deg);
    transition: opacity $anim-speed;
    user-select: none;

    &:before,
    &:after {
      content: '';
      display: block;
      position: absolute;
      pointer-events: none;
    }

    &:before {
      @include size(100%, 30px);
      background-color: darken($red, 30%);
      transform: skewy(-45deg);
      transform-origin: 100% 100%;
      top: 0;
      left: -30px;

    }

    &:after {
      @include size(30px, 100%);
      background-color: darken($red, 20%);
      transform: skewX(-45deg);
      transform-origin: 0% 0%;
      top: 100%;
    }

    &--1 {
      opacity: 1;
      grid-template-columns: repeat($maze__size--1, 1fr);
      grid-template-rows: repeat($maze__size--1, 1fr);
      transition: opacity $anim-speed;
      z-index: 5;

      .path {

        &--1 {
          grid-column-start: 3;
          grid-column-end: 4;
          grid-row-start: 1;
          grid-row-end: 4;

          &:before {
            height: $maze__startpoint;
            left: 0;
            top: -1px;
            width: 100%;
          }
        }

        &--finish {
          grid-column-start: 3;
          grid-column-end: 4;
          grid-row-start: 4;
          grid-row-end: 5;
        }

        &--end {
          grid-column-start: 3;
          grid-column-end: 4;
          grid-row-start: 5;
          grid-row-end: 6;
        }
      }
    }

    &--2 {
      grid-template-columns: repeat($maze__size--2, 1fr);
      grid-template-rows: repeat($maze__size--2, 1fr);

      .path {

        &--1 {
          grid-column-start: 1;
          grid-column-end: 10;
          grid-row-start: 2;
          grid-row-end: 3;

          &:before {
            height: 100%;
            top: 0;
            left: -1px;
            width: $maze__startpoint;
          }
        }

        &--2 {
          grid-column-start: 9;
          grid-column-end: 10;
          grid-row-start: 3;
          grid-row-end: 5;
        }

        &--3 {
          grid-column-start: 2;
          grid-column-end: 10;
          grid-row-start: 5;
          grid-row-end: 6;
        }

        &--4 {
          grid-column-start: 2;
          grid-column-end: 3;
          grid-row-start: 6;
          grid-row-end: 10;
        }

        &--5 {
          grid-column-start: 2;
          grid-column-end: 9;
          grid-row-start: 9;
          grid-row-end: 10;
        }

        &--finish {
          grid-column-start: 9;
          grid-column-end: 10;
          grid-row-start: 9;
          grid-row-end: 10;
        }

        &--end {
          grid-column-start: 9;
          grid-column-end: 10;
          grid-row-start: 10;
          grid-row-end: 11;
        }
      }
    }

    &--3 {
      grid-template-columns: repeat($maze__size--3, 1fr);
      grid-template-rows: repeat($maze__size--3, 1fr);

      .path {

        &--1 {
          grid-column-start: 1;
          grid-column-end: 19;
          grid-row-start: 2;
          grid-row-end: 2;

          &:before {
            height: 100%;
            top: 0;
            left: -1px;
            width: $maze__startpoint;
          }
        }

        &--2 {
          grid-column-start: 19;
          grid-column-end: 19;
          grid-row-start: 2;
          grid-row-end: 11;
        }

        &--3 {
          grid-column-start: 2;
          grid-column-end: 19;
          grid-row-start: 10;
          grid-row-end: 11;
        }

        &--4 {
          grid-column-start: 2;
          grid-column-end: 3;
          grid-row-start: 11;
          grid-row-end: 13;
        }

        &--5 {
          grid-column-start: 3;
          grid-column-end: 20;
          grid-row-start: 12;
          grid-row-end: 13;
        }

        &--6 {
          grid-column-start: 19;
          grid-column-end: 20;
          grid-row-start: 12;
          grid-row-end: 20;
        }

        &--7 {
          grid-column-start: 3;
          grid-column-end: 20;
          grid-row-start: 19;
          grid-row-end: 20;
        }

        &--finish {
          grid-column-start: 2;
          grid-column-end: 3;
          grid-row-start: 19;
          grid-row-end: 20;
        }

        &--end {
          grid-column-start: 2;
          grid-column-end: 3;
          grid-row-start: 20;
          grid-row-end: 21;
        }
      }
    }

    &--4 {
      grid-template-columns: repeat($maze__size--4, 1fr);
      grid-template-rows: repeat($maze__size--4, 1fr);

      .path {

        &--1 {
          grid-column-start: 4;
          grid-column-end: 5;
          grid-row-start: 1;
          grid-row-end: 16;

          &:before {
            height: $maze__startpoint;
            top: -1px;
            left: 0;
            width: 100%;
          }
        }

        &--2 {
          grid-column-start: 4;
          grid-column-end: 15;
          grid-row-start: 16;
          grid-row-end: 17;
        }

        &--3 {
          grid-column-start: 14;
          grid-column-end: 15;
          grid-row-start: 2;
          grid-row-end: 16;
        }

        &--4 {
          grid-column-start: 15;
          grid-column-end: 17 ;
          grid-row-start: 2;
          grid-row-end: 3;
        }

        &--5 {
          grid-column-start: 16;
          grid-column-end: 17;
          grid-row-start: 3;
          grid-row-end: 24;
        }

        &--finish {
          grid-column-start: 16;
          grid-column-end: 17;
          grid-row-start: 24;
          grid-row-end: 25;
        }

        &--end {
          grid-column-start: 16;
          grid-column-end: 17;
          grid-row-start: 25;
          grid-row-end: 26;
        }
      }
    }

    &--5 {
      grid-template-columns: repeat($maze__size--5, 1fr);
      grid-template-rows: repeat($maze__size--5, 1fr);

      .path {

        &--1 {
          grid-column-start: 2;
          grid-column-end: 41;
          grid-row-start: 2;
          grid-row-end: 3;

          &:before {
            height: 100%;
            top: 0;
            right: -1px;
            width: $maze__startpoint;
          }
        }

        &--2 {
          grid-column-start: 2;
          grid-column-end: 3;
          grid-row-start: 3;
          grid-row-end: 20;
        }

        &--3 {
          grid-column-start: 2;
          grid-column-end: 40;
          grid-row-start: 20;
          grid-row-end: 21;
        }

        &--4 {
          grid-column-start: 39;
          grid-column-end: 40;
          grid-row-start: 21;
          grid-row-end: 40;
        }

        &--5 {
          grid-column-start: 3;
          grid-column-end: 39;
          grid-row-start: 39;
          grid-row-end: 40;
        }

        &--finish {
          grid-column-start: 2;
          grid-column-end: 3;
          grid-row-start: 39;
          grid-row-end: 40;

          &:hover {

            & + .finish {
              opacity: 1;
              pointer-events: all;
            }
          }
        }
      }

      .finish {
        bottom: 0;
        height: 100%;
        font-size: 24px;
        top: 0;

        .line {
          display: flex;
          flex-wrap: wrap;
          justify-content: center;
        }

        &:hover {
          opacity: 1;
          pointer-events: all;
        }

      }
    }

    &:hover {
      cursor: not-allowed;

      & .gameover {
        display: flex;
      }
    }

    .path {
      background-color: #fff;
      cursor: default;
      position: relative;

      &:first-child {

        &:before {
          background-color: $green;
          content: '';
          display: block;
          position: absolute;
        }
      }

      &:hover {

        & ~ .gameover {
          display: none;
        }
      }

      &--finish {

        &:hover {

          & ~ .path--end {
            height: 100%;
            opacity: 1;
            transition: all $anim-speed;
          }
        }
      }

      &--end {
        @include size(0, 100%);
        opacity: 0;
        transition: opacity $anim-speed, height $anim-speed;

        &:hover {
          height: 100%;
          opacity: 1;
          transition: all $anim-speed;

          & ~ .finish {
            display: flex;
            opacity: 1;
            pointer-events: all;
          }
        }
      }
    }
  }

  .step {
    @include square(0);
    left: 0;
    position: absolute;
    top: 0;
    visibility: hidden;

    &:checked {

      & + .maze {
        opacity: 0 !important;
        pointer-events: none !important;
        transition: opacity $anim-speed;

        & + .step {

          & + .maze {
            opacity: 1;
            pointer-events: all;
            transition: opacity $anim-speed $anim-speed;
            z-index: 5;
          }
        }
      }
    }
  }

  .line {
    padding: 0 30px;
    width: 100%;

    label {
      cursor: pointer;
      font-weight: bold;
      text-decoration: underline;
    }
  }

  .upper {
    text-transform: uppercase;
  }
}

.instruction {
  background-color: #fff;
  border: solid 1px $black;
  box-shadow: 0 0 15px 5px rgba($black, 0.5);
  flex-direction: column;
  left: 10px;
  max-width: 200px;
  padding: 20px;
  position: absolute;
  top: 10px;

  .line {
    padding: 0;
  }
}

.line {
  margin-bottom: 10px;
}

.title {
  font-size: 24px;
}

.tweet {
  background-color: $tweet;
  border: solid 1px $tweet;
  border-radius: 15px;
  color: $white;
  font-size: 16px;
  margin-top: 20px;
  padding: 10px 20px;
  text-decoration: none;
}

footer {
  background-color: lighten($blue, 5%);
  bottom: 0;
  box-shadow: 0px 0px 10px 5px rgba($black, 0.5);
  color: $white;
  display: flex;
  left: 0;
  padding: 15px;
  position: fixed;
  right: 0;

  a {
    color: $white;
  }

  .center {
    display: flex;
    flex: 1 0 auto;
    justify-content: center;
  }

  .opposite {
    margin-left: auto;
  }
}

              
            
!

JS

              
                // Don't look here for some JS code
// You will not found any of this here
// Another Pure CSS game
// Made by Itzik Pop
// Contact me @ https://www.linkedin.com/in/itzikpop/
              
            
!
999px

Console