- let n = 4; /* number of columns/rows, don't forget to adjust the CSS value */
- let image = "https://assets.codepen.io/1480814/1015-800x800.jpg";

h1 CSS Puzzle
p drag & drop the piece into...<br> Well, you know how a puzzle works :)
g(style=`--i:url(${image})`)
  - for(let i = 0; i < n*n; i++)
    z
      a
      b(draggable="true")

$n : 4; /* number of columns/rows, don't forget to adjust the HTML value */

g {
  --s: 300px; /* size of the puzzle */
  display: grid;
  max-width: var(--s);
  border: 1px solid;
  margin: auto;
  grid-template-columns: repeat($n,1fr);
}
g:before {
  content: "Original Image";
  color: #fff;
  font-size: 25px;
  font-weight: bold;
  text-shadow: 0 0 2px #000,0 0 2px #000,0 0 2px #000;
  position: fixed;
  top: 10px;
  left: 10px;
  width: calc(var(--s)*0.6);
  aspect-ratio: 1;
  -webkit-mask: repeating-linear-gradient(-45deg,#000 0 10%,#000d 0 20%);
  background: var(--i) 0/100% 100%;
  display: grid;
  place-content: center;
}
z {
  aspect-ratio: 1;
  outline: 1px dashed;
  display: grid;
  position: relative;
  pointer-events: none;
}
a {
  grid-area: 1/1;
  width: 0;
  transition: 0s .2s;
  pointer-events: initial;
}
b {
  grid-area: 1/1;
  background: var(--i) 0/var(--s) var(--s);
  box-shadow: 0 0 4px 1px red;
  z-index: 2;
  cursor: grab;
  pointer-events: initial;
}
@for $i from 1 to ($n*$n + 1) {
  $r: (random(180));
  $x: (($i - 1)%$n);
  $y: floor(($i - 0.001)/$n);
  z:nth-of-type(#{$i}) b{
    background-position: ($x/($n - 1))*100% ($y/($n - 1))*100%;
    transform: 
      translate((($n - 1)/2 - $x)*100%,(($n - 1)/2 - $y)*100%) 
      rotate($r*1deg) 
      translate((random(100)*1% + ($n - 1)*100%)) 
      rotate((random(20) - 10 - $r)*1deg)
  }
}
z b {
  transition: 9999s 9999s;
}
z:active a{
  width: 100%;
  transition: 0s;
}
z a:hover ~ b {
  transform: translate(0);
  box-shadow: none;
  transition: 0s;
}

body {
  background: #2c6603;
  color: #fff;
  font-family: system-ui, sans-serif;
}
h1 {
  font-size: 2rem;
  margin: 0;
  text-align: center;
}
p {
  font-size: 1.2rem;
  text-align: center;
}