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HTML 

              
                </body>
<head>
  <meta charset="utf-8">
  <title>Twenty Fourty Tyler</title>

  <link href="style/main.css" rel="stylesheet" type="text/css">
  <link rel="shortcut icon" href="favicon.ico">
  <link rel="apple-touch-icon" href="meta/apple-touch-icon.png">
  <meta name="apple-mobile-web-app-capable" content="yes">
  <meta name="apple-mobile-web-app-status-bar-style" content="black">

  <meta name="HandheldFriendly" content="True">
  <meta name="MobileOptimized" content="320">
  <meta name="viewport" content="width=device-width, target-densitydpi=160dpi, initial-scale=1.0, maximum-scale=1, user-scalable=no, minimal-ui">
  <meta name="format-detection" content="telephone=no">

  <meta property="og:title" content="2048 game">
  <meta property="og:site_name" content="2048 game">
  <meta property="og:description" content="Join the numbers and get to the 2048 tile! Careful: this game is extremely addictive!">
  <meta property="og:image" content="https://gabrielecirulli.github.io/2048/meta/og_image.png">
<style type="text/css"></style></head>
    <body data-twttr-rendered="true">
  <div class="container">
    <div class="heading">
      <h1 class="title">2048</h1>
      <div class="scores-container">
        <div class="score-container">4<div class="score-addition">+4</div></div>
        <div class="best-container">4</div>
      </div>
    </div>

    <div class="above-game">
      <p class="game-intro">Join the numbers and get to the <strong>2048 tile!</strong></p>
      <a class="restart-button">New Game</a>
    </div>

    <div class="game-container">
      <div class="game-message">
        <p></p>
        <div class="lower">
	        <a class="keep-playing-button">Keep going</a>
          <a class="retry-button">Try again</a>
          <div class="score-sharing"></div>
          <div class="mailing-list">
            <!-- MailChimp Signup Form -->
            <form action="http://gabrielecirulli.us8.list-manage.com/subscribe/post?u=991201206817cfb4e4247ed6c&amp;id=7928ea817b" method="post" name="mc-embedded-subscribe-form" class="mailing-list-form" target="_blank">
              <strong>Get email updates from Gabriele</strong>

              <input type="email" value="" name="EMAIL" class="mailing-list-email-field" placeholder="Your email address" spellcheck="false">

              <!-- real people should not fill this in and expect good things - do not remove this or risk form bot signups-->
              <div style="position: absolute; left: -9999px;">
                <input type="text" name="b_991201206817cfb4e4247ed6c_7928ea817b" value="">
              </div>

              <input type="submit" value="Go" name="subscribe" class="mailing-list-subscribe-button">
            </form>
          </div>
        </div>
      </div>

      <div class="grid-container">
        <div class="grid-row">
          <div class="grid-cell"></div>
          <div class="grid-cell"></div>
          <div class="grid-cell"></div>
          <div class="grid-cell"></div>
        </div>
        <div class="grid-row">
          <div class="grid-cell"></div>
          <div class="grid-cell"></div>
          <div class="grid-cell"></div>
          <div class="grid-cell"></div>
        </div>
        <div class="grid-row">
          <div class="grid-cell"></div>
          <div class="grid-cell"></div>
          <div class="grid-cell"></div>
          <div class="grid-cell"></div>
        </div>
        <div class="grid-row">
          <div class="grid-cell"></div>
          <div class="grid-cell"></div>
          <div class="grid-cell"></div>
          <div class="grid-cell"></div>
        </div>
      </div>

      <div class="tile-container"><div class="tile tile-2 tile-position-1-4"><div class="tile-inner">2</div></div><div class="tile tile-2 tile-position-1-4"><div class="tile-inner">2</div></div><div class="tile tile-4 tile-position-1-4 tile-merged"><div class="tile-inner">4</div></div><div class="tile tile-2 tile-position-2-3 tile-new"><div class="tile-inner">2</div></div></div>
    </div>

    <p class="game-explanation">
      <strong class="important">How to play:</strong> Use your <strong>arrow keys</strong> to move the tiles. When two tiles with the same number touch, they <strong>merge into one!</strong>
    </p>
    <hr>
    <p>
    <strong 
    </p>
    <hr>
    <p>
   
    </p>


    </div>
  </div>

  <script src="js/bind_polyfill.js"></script>
  <script src="js/classlist_polyfill.js"></script>
  <script src="js/animframe_polyfill.js"></script>
  <script src="js/keyboard_input_manager.js"></script>
  <script src="js/html_actuator.js"></script>
  <script src="js/grid.js"></script>
  <script src="js/tile.js"></script>
  <script src="js/local_storage_manager.js"></script>
  <script src="js/game_manager.js"></script>
  <script src="js/application.js"></script>

  <script>
    (function(i,s,o,g,r,a,m){i["GoogleAnalyticsObject"]=r;i[r]=i[r]||function(){
    (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
    m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
    })(window,document,"script","//www.google-analytics.com/analytics.js","ga");

 
  </script>


</body>
!

CSS 

              
                @import url(fonts/clear-sans.css);
html, body {
  margin: 0;
  padding: 0;
  background: #69C261;
  color: #776e65;
font-family: "fangsong"
  font-size: 18px; }

body {
  margin: 80px 0; }

input {
  display: inline-block;
  background: #8f7a66;
  border-radius: 3px;
  padding: 0 20px;
  text-decoration: none;
  color: #f9f6f2;
  height: 40px;
  line-height: 42px;
  cursor: pointer;
  font: inherit;
  border: none;
  outline: none;
  box-sizing: border-box;
  font-weight: bold;
  margin: 0;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none; }
  input[type="text"], input[type="email"] {
    cursor: auto;
    background: #fcfbf9;
    font-weight: normal;
    color: #776e65;
    padding: 0 15px; }
    input[type="text"]::-webkit-input-placeholder, input[type="email"]::-webkit-input-placeholder {
      color: #9d948c; }
    input[type="text"]::-moz-placeholder, input[type="email"]::-moz-placeholder {
      color: #9d948c; }
    input[type="text"]:-ms-input-placeholder, input[type="email"]:-ms-input-placeholder {
      color: #9d948c; }

.heading:after {
  content: "";
  display: block;
  clear: both; }

h1.title {
  font-size: 80px;
  font-weight: bold;
  margin: 0;
  display: block;
  float: left; }

@-webkit-keyframes move-up {
  0% {
    top: 25px;
    opacity: 1; }

  100% {
    top: -50px;
    opacity: 0; } }
@-moz-keyframes move-up {
  0% {
    top: 25px;
    opacity: 1; }

  100% {
    top: -50px;
    opacity: 0; } }
@keyframes move-up {
  0% {
    top: 25px;
    opacity: 1; }

  100% {
    top: -50px;
    opacity: 0; } }
.scores-container {
  float: right;
  text-align: right; }

.score-container, .best-container {
  position: relative;
  display: inline-block;
  background: #bbada0;
  padding: 15px 25px;
  font-size: 25px;
  height: 25px;
  line-height: 47px;
  font-weight: bold;
  border-radius: 3px;
  color: white;
  margin-top: 8px;
  text-align: center; }
  .score-container:after, .best-container:after {
    position: absolute;
    width: 100%;
    top: 10px;
    left: 0;
    text-transform: uppercase;
    font-size: 13px;
    line-height: 13px;
    text-align: center;
    color: #eee4da; }
  .score-container .score-addition, .best-container .score-addition {
    position: absolute;
    right: 30px;
    color: red;
    font-size: 25px;
    line-height: 25px;
    font-weight: bold;
    color: rgba(119, 110, 101, 0.9);
    z-index: 100;
    -webkit-animation: move-up 600ms ease-in;
    -moz-animation: move-up 600ms ease-in;
    animation: move-up 600ms ease-in;
    -webkit-animation-fill-mode: both;
    -moz-animation-fill-mode: both;
    animation-fill-mode: both; }

.score-container:after {
  content: "Score"; }

.best-container:after {
  content: "Best"; }

p {
  margin-top: 0;
  margin-bottom: 10px;
  line-height: 1.65; }

a {
  color: #776e65;
  font-weight: bold;
  text-decoration: underline;
  cursor: pointer; }

strong.important {
  text-transform: uppercase; }

hr {
  border: none;
  border-bottom: 1px solid #d8d4d0;
  margin-top: 20px;
  margin-bottom: 30px; }

.container {
  width: 500px;
  margin: 0 auto; }

@-webkit-keyframes fade-in {
  0% {
    opacity: 0; }

  100% {
    opacity: 1; } }
@-moz-keyframes fade-in {
  0% {
    opacity: 0; }

  100% {
    opacity: 1; } }
@keyframes fade-in {
  0% {
    opacity: 0; }

  100% {
    opacity: 1; } }
@-webkit-keyframes slide-up {
  0% {
    margin-top: 32%; }

  100% {
    margin-top: 20%; } }
@-moz-keyframes slide-up {
  0% {
    margin-top: 32%; }

  100% {
    margin-top: 20%; } }
@keyframes slide-up {
  0% {
    margin-top: 32%; }

  100% {
    margin-top: 20%; } }
.game-container {
  margin-top: 40px;
  position: relative;
  padding: 15px;
  cursor: default;
  -webkit-touch-callout: none;
  -ms-touch-callout: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  -ms-touch-action: none;
  touch-action: none;
  background: #bbada0;
  border-radius: 6px;
  width: 500px;
  height: 500px;
  -webkit-box-sizing: border-box;
  -moz-box-sizing: border-box;
  box-sizing: border-box; }

.game-message {
  display: none;
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background: rgba(238, 228, 218, 0.73);
  z-index: 100;
  padding-top: 40px;
  text-align: center;
  -webkit-animation: fade-in 800ms ease 1200ms;
  -moz-animation: fade-in 800ms ease 1200ms;
  animation: fade-in 800ms ease 1200ms;
  -webkit-animation-fill-mode: both;
  -moz-animation-fill-mode: both;
  animation-fill-mode: both; }
  .game-message p {
    font-size: 60px;
    font-weight: bold;
    height: 60px;
    line-height: 60px;
    margin-top: 222px; }
  .game-message .lower {
    display: block;
    margin-top: 29px; }
  .game-message .mailing-list {
    margin-top: 52px; }
    .game-message .mailing-list strong {
      display: block;
      margin-bottom: 10px; }
    .game-message .mailing-list .mailing-list-email-field {
      width: 230px;
      margin-right: 5px; }
  .game-message a {
    display: inline-block;
    background: #8f7a66;
    border-radius: 3px;
    padding: 0 20px;
    text-decoration: none;
    color: #f9f6f2;
    height: 40px;
    line-height: 42px;
    cursor: pointer;
    margin-left: 9px; }
    .game-message a.keep-playing-button {
      display: none; }
  .game-message .score-sharing {
    display: inline-block;
    vertical-align: middle;
    margin-left: 10px; }
  .game-message.game-won {
    background: rgba(237, 194, 46, 0.5);
    color: #f9f6f2; }
    .game-message.game-won a.keep-playing-button {
      display: inline-block; }
  .game-message.game-won, .game-message.game-over {
    display: block; }
    .game-message.game-won p, .game-message.game-over p {
      -webkit-animation: slide-up 1.5s ease-in-out 2500ms;
      -moz-animation: slide-up 1.5s ease-in-out 2500ms;
      animation: slide-up 1.5s ease-in-out 2500ms;
      -webkit-animation-fill-mode: both;
      -moz-animation-fill-mode: both;
      animation-fill-mode: both; }
    .game-message.game-won .mailing-list, .game-message.game-over .mailing-list {
      -webkit-animation: fade-in 1.5s ease-in-out 2500ms;
      -moz-animation: fade-in 1.5s ease-in-out 2500ms;
      animation: fade-in 1.5s ease-in-out 2500ms;
      -webkit-animation-fill-mode: both;
      -moz-animation-fill-mode: both;
      animation-fill-mode: both; }

.grid-container {
  position: absolute;
  z-index: 1; }

.grid-row {
  margin-bottom: 15px; }
  .grid-row:last-child {
    margin-bottom: 0; }
  .grid-row:after {
    content: "";
    display: block;
    clear: both; }

.grid-cell {
  width: 106.25px;
  height: 106.25px;
  margin-right: 15px;
  float: left;
  border-radius: 3px;
  background: rgba(238, 228, 218, 0.35); }
  .grid-cell:last-child {
    margin-right: 0; }

.tile-container {
  position: absolute;
  z-index: 2; }

.tile, .tile .tile-inner {
  width: 107px;
  height: 107px;
  line-height: 116.25px; }
.tile.tile-position-1-1 {
  -webkit-transform: translate(0px, 0px);
  -moz-transform: translate(0px, 0px);
  transform: translate(0px, 0px); }
.tile.tile-position-1-2 {
  -webkit-transform: translate(0px, 121px);
  -moz-transform: translate(0px, 121px);
  transform: translate(0px, 121px); }
.tile.tile-position-1-3 {
  -webkit-transform: translate(0px, 242px);
  -moz-transform: translate(0px, 242px);
  transform: translate(0px, 242px); }
.tile.tile-position-1-4 {
  -webkit-transform: translate(0px, 363px);
  -moz-transform: translate(0px, 363px);
  transform: translate(0px, 363px); }
.tile.tile-position-2-1 {
  -webkit-transform: translate(121px, 0px);
  -moz-transform: translate(121px, 0px);
  transform: translate(121px, 0px); }
.tile.tile-position-2-2 {
  -webkit-transform: translate(121px, 121px);
  -moz-transform: translate(121px, 121px);
  transform: translate(121px, 121px); }
.tile.tile-position-2-3 {
  -webkit-transform: translate(121px, 242px);
  -moz-transform: translate(121px, 242px);
  transform: translate(121px, 242px); }
.tile.tile-position-2-4 {
  -webkit-transform: translate(121px, 363px);
  -moz-transform: translate(121px, 363px);
  transform: translate(121px, 363px); }
.tile.tile-position-3-1 {
  -webkit-transform: translate(242px, 0px);
  -moz-transform: translate(242px, 0px);
  transform: translate(242px, 0px); }
.tile.tile-position-3-2 {
  -webkit-transform: translate(242px, 121px);
  -moz-transform: translate(242px, 121px);
  transform: translate(242px, 121px); }
.tile.tile-position-3-3 {
  -webkit-transform: translate(242px, 242px);
  -moz-transform: translate(242px, 242px);
  transform: translate(242px, 242px); }
.tile.tile-position-3-4 {
  -webkit-transform: translate(242px, 363px);
  -moz-transform: translate(242px, 363px);
  transform: translate(242px, 363px); }
.tile.tile-position-4-1 {
  -webkit-transform: translate(363px, 0px);
  -moz-transform: translate(363px, 0px);
  transform: translate(363px, 0px); }
.tile.tile-position-4-2 {
  -webkit-transform: translate(363px, 121px);
  -moz-transform: translate(363px, 121px);
  transform: translate(363px, 121px); }
.tile.tile-position-4-3 {
  -webkit-transform: translate(363px, 242px);
  -moz-transform: translate(363px, 242px);
  transform: translate(363px, 242px); }
.tile.tile-position-4-4 {
  -webkit-transform: translate(363px, 363px);
  -moz-transform: translate(363px, 363px);
  transform: translate(363px, 363px); }

.tile {
  position: absolute;
  -webkit-transition: 100ms ease-in-out;
  -moz-transition: 100ms ease-in-out;
  transition: 100ms ease-in-out;
  -webkit-transition-property: -webkit-transform;
  -moz-transition-property: -moz-transform;
  transition-property: transform; }
  .tile .tile-inner {
    border-radius: 3px;
    background: #eee4da;
    text-align: center;
    font-weight: bold;
    z-index: 10;
    font-size: 55px; }
  .tile.tile-2 .tile-inner {
    background: #eee4da;
    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0), inset 0 0 0 1px rgba(255, 255, 255, 0); }
  .tile.tile-4 .tile-inner {
    background: #ede0c8;
    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0), inset 0 0 0 1px rgba(255, 255, 255, 0); }
  .tile.tile-8 .tile-inner {
    color: #f9f6f2;
    background: #f2b179; }
  .tile.tile-16 .tile-inner {
    color: #f9f6f2;
    background: #f59563; }
  .tile.tile-32 .tile-inner {
    color: #f9f6f2;
    background: #f67c5f; }
  .tile.tile-64 .tile-inner {
    color: #f9f6f2;
    background: #f65e3b; }
  .tile.tile-128 .tile-inner {
    color: #f9f6f2;
    background: #edcf72;
    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0.2381), inset 0 0 0 1px rgba(255, 255, 255, 0.14286);
    font-size: 45px; }
    @media screen and (max-width: 520px) {
      .tile.tile-128 .tile-inner {
        font-size: 25px; } }
  .tile.tile-256 .tile-inner {
    color: #f9f6f2;
    background: #edcc61;
    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0.31746), inset 0 0 0 1px rgba(255, 255, 255, 0.19048);
    font-size: 45px; }
    @media screen and (max-width: 520px) {
      .tile.tile-256 .tile-inner {
        font-size: 25px; } }
  .tile.tile-512 .tile-inner {
    color: #f9f6f2;
    background: #edc850;
    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0.39683), inset 0 0 0 1px rgba(255, 255, 255, 0.2381);
    font-size: 45px; }
    @media screen and (max-width: 520px) {
      .tile.tile-512 .tile-inner {
        font-size: 25px; } }
  .tile.tile-1024 .tile-inner {
    color: #f9f6f2;
    background: #edc53f;
    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0.47619), inset 0 0 0 1px rgba(255, 255, 255, 0.28571);
    font-size: 35px; }
    @media screen and (max-width: 520px) {
      .tile.tile-1024 .tile-inner {
        font-size: 15px; } }
  .tile.tile-2048 .tile-inner {
    color: #f9f6f2;
    background: #edc22e;
    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0.55556), inset 0 0 0 1px rgba(255, 255, 255, 0.33333);
    font-size: 35px; }
    @media screen and (max-width: 520px) {
      .tile.tile-2048 .tile-inner {
        font-size: 15px; } }
  .tile.tile-super .tile-inner {
    color: #f9f6f2;
    background: #3c3a32;
    font-size: 30px; }
    @media screen and (max-width: 520px) {
      .tile.tile-super .tile-inner {
        font-size: 10px; } }

@-webkit-keyframes appear {
  0% {
    opacity: 0;
    -webkit-transform: scale(0);
    -moz-transform: scale(0);
    transform: scale(0); }

  100% {
    opacity: 1;
    -webkit-transform: scale(1);
    -moz-transform: scale(1);
    transform: scale(1); } }
@-moz-keyframes appear {
  0% {
    opacity: 0;
    -webkit-transform: scale(0);
    -moz-transform: scale(0);
    transform: scale(0); }

  100% {
    opacity: 1;
    -webkit-transform: scale(1);
    -moz-transform: scale(1);
    transform: scale(1); } }
@keyframes appear {
  0% {
    opacity: 0;
    -webkit-transform: scale(0);
    -moz-transform: scale(0);
    transform: scale(0); }

  100% {
    opacity: 1;
    -webkit-transform: scale(1);
    -moz-transform: scale(1);
    transform: scale(1); } }
.tile-new .tile-inner {
  -webkit-animation: appear 200ms ease 100ms;
  -moz-animation: appear 200ms ease 100ms;
  animation: appear 200ms ease 100ms;
  -webkit-animation-fill-mode: backwards;
  -moz-animation-fill-mode: backwards;
  animation-fill-mode: backwards; }

@-webkit-keyframes pop {
  0% {
    -webkit-transform: scale(0);
    -moz-transform: scale(0);
    transform: scale(0); }

  50% {
    -webkit-transform: scale(1.2);
    -moz-transform: scale(1.2);
    transform: scale(1.2); }

  100% {
    -webkit-transform: scale(1);
    -moz-transform: scale(1);
    transform: scale(1); } }
@-moz-keyframes pop {
  0% {
    -webkit-transform: scale(0);
    -moz-transform: scale(0);
    transform: scale(0); }

  50% {
    -webkit-transform: scale(1.2);
    -moz-transform: scale(1.2);
    transform: scale(1.2); }

  100% {
    -webkit-transform: scale(1);
    -moz-transform: scale(1);
    transform: scale(1); } }
@keyframes pop {
  0% {
    -webkit-transform: scale(0);
    -moz-transform: scale(0);
    transform: scale(0); }

  50% {
    -webkit-transform: scale(1.2);
    -moz-transform: scale(1.2);
    transform: scale(1.2); }

  100% {
    -webkit-transform: scale(1);
    -moz-transform: scale(1);
    transform: scale(1); } }
.tile-merged .tile-inner {
  z-index: 20;
  -webkit-animation: pop 200ms ease 100ms;
  -moz-animation: pop 200ms ease 100ms;
  animation: pop 200ms ease 100ms;
  -webkit-animation-fill-mode: backwards;
  -moz-animation-fill-mode: backwards;
  animation-fill-mode: backwards; }

.above-game:after {
  content: "";
  display: block;
  clear: both; }

.game-intro {
  float: left;
  line-height: 42px;
  margin-bottom: 0; }

.restart-button {
  display: inline-block;
  background: #8f7a66;
  border-radius: 3px;
  padding: 0 20px;
  text-decoration: none;
  color: #f9f6f2;
  height: 40px;
  line-height: 42px;
  cursor: pointer;
  display: block;
  text-align: center;
  float: right; }

.game-explanation {
  margin-top: 50px; }

.sharing {
  margin-top: 20px;
  text-align: center; }
  .sharing > iframe, .sharing > span, .sharing > form {
    display: inline-block;
    vertical-align: middle; }

@media screen and (max-width: 520px) {
  html, body {
    font-size: 15px; }

  body {
    margin: 20px 0;
    padding: 0 20px; }

  h1.title {
    font-size: 27px;
    margin-top: 15px; }

  .container {
    width: 280px;
    margin: 0 auto; }

  .score-container, .best-container {
    margin-top: 0;
    padding: 15px 10px;
    min-width: 40px; }

  .heading {
    margin-bottom: 10px; }

  .game-intro {
    width: 55%;
    display: block;
    box-sizing: border-box;
    line-height: 1.65; }

  .restart-button {
    width: 42%;
    padding: 0;
    display: block;
    box-sizing: border-box;
    margin-top: 2px; }

  .game-container {
    margin-top: 17px;
    position: relative;
    padding: 10px;
    cursor: default;
    -webkit-touch-callout: none;
    -ms-touch-callout: none;
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    -ms-touch-action: none;
    touch-action: none;
    background: #bbada0;
    border-radius: 6px;
    width: 280px;
    height: 280px;
    -webkit-box-sizing: border-box;
    -moz-box-sizing: border-box;
    box-sizing: border-box; }

  .game-message {
    display: none;
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    background: rgba(238, 228, 218, 0.73);
    z-index: 100;
    padding-top: 40px;
    text-align: center;
    -webkit-animation: fade-in 800ms ease 1200ms;
    -moz-animation: fade-in 800ms ease 1200ms;
    animation: fade-in 800ms ease 1200ms;
    -webkit-animation-fill-mode: both;
    -moz-animation-fill-mode: both;
    animation-fill-mode: both; }
    .game-message p {
      font-size: 60px;
      font-weight: bold;
      height: 60px;
      line-height: 60px;
      margin-top: 222px; }
    .game-message .lower {
      display: block;
      margin-top: 29px; }
    .game-message .mailing-list {
      margin-top: 52px; }
      .game-message .mailing-list strong {
        display: block;
        margin-bottom: 10px; }
      .game-message .mailing-list .mailing-list-email-field {
        width: 230px;
        margin-right: 5px; }
    .game-message a {
      display: inline-block;
      background: #8f7a66;
      border-radius: 3px;
      padding: 0 20px;
      text-decoration: none;
      color: #f9f6f2;
      height: 40px;
      line-height: 42px;
      cursor: pointer;
      margin-left: 9px; }
      .game-message a.keep-playing-button {
        display: none; }
    .game-message .score-sharing {
      display: inline-block;
      vertical-align: middle;
      margin-left: 10px; }
    .game-message.game-won {
      background: rgba(237, 194, 46, 0.5);
      color: #f9f6f2; }
      .game-message.game-won a.keep-playing-button {
        display: inline-block; }
    .game-message.game-won, .game-message.game-over {
      display: block; }
      .game-message.game-won p, .game-message.game-over p {
        -webkit-animation: slide-up 1.5s ease-in-out 2500ms;
        -moz-animation: slide-up 1.5s ease-in-out 2500ms;
        animation: slide-up 1.5s ease-in-out 2500ms;
        -webkit-animation-fill-mode: both;
        -moz-animation-fill-mode: both;
        animation-fill-mode: both; }
      .game-message.game-won .mailing-list, .game-message.game-over .mailing-list {
        -webkit-animation: fade-in 1.5s ease-in-out 2500ms;
        -moz-animation: fade-in 1.5s ease-in-out 2500ms;
        animation: fade-in 1.5s ease-in-out 2500ms;
        -webkit-animation-fill-mode: both;
        -moz-animation-fill-mode: both;
        animation-fill-mode: both; }

  .grid-container {
    position: absolute;
    z-index: 1; }

  .grid-row {
    margin-bottom: 10px; }
    .grid-row:last-child {
      margin-bottom: 0; }
    .grid-row:after {
      content: "";
      display: block;
      clear: both; }

  .grid-cell {
    width: 57.5px;
    height: 57.5px;
    margin-right: 10px;
    float: left;
    border-radius: 3px;
    background: rgba(238, 228, 218, 0.35); }
    .grid-cell:last-child {
      margin-right: 0; }

  .tile-container {
    position: absolute;
    z-index: 2; }

  .tile, .tile .tile-inner {
    width: 58px;
    height: 58px;
    line-height: 67.5px; }
  .tile.tile-position-1-1 {
    -webkit-transform: translate(0px, 0px);
    -moz-transform: translate(0px, 0px);
    transform: translate(0px, 0px); }
  .tile.tile-position-1-2 {
    -webkit-transform: translate(0px, 67px);
    -moz-transform: translate(0px, 67px);
    transform: translate(0px, 67px); }
  .tile.tile-position-1-3 {
    -webkit-transform: translate(0px, 135px);
    -moz-transform: translate(0px, 135px);
    transform: translate(0px, 135px); }
  .tile.tile-position-1-4 {
    -webkit-transform: translate(0px, 202px);
    -moz-transform: translate(0px, 202px);
    transform: translate(0px, 202px); }
  .tile.tile-position-2-1 {
    -webkit-transform: translate(67px, 0px);
    -moz-transform: translate(67px, 0px);
    transform: translate(67px, 0px); }
  .tile.tile-position-2-2 {
    -webkit-transform: translate(67px, 67px);
    -moz-transform: translate(67px, 67px);
    transform: translate(67px, 67px); }
  .tile.tile-position-2-3 {
    -webkit-transform: translate(67px, 135px);
    -moz-transform: translate(67px, 135px);
    transform: translate(67px, 135px); }
  .tile.tile-position-2-4 {
    -webkit-transform: translate(67px, 202px);
    -moz-transform: translate(67px, 202px);
    transform: translate(67px, 202px); }
  .tile.tile-position-3-1 {
    -webkit-transform: translate(135px, 0px);
    -moz-transform: translate(135px, 0px);
    transform: translate(135px, 0px); }
  .tile.tile-position-3-2 {
    -webkit-transform: translate(135px, 67px);
    -moz-transform: translate(135px, 67px);
    transform: translate(135px, 67px); }
  .tile.tile-position-3-3 {
    -webkit-transform: translate(135px, 135px);
    -moz-transform: translate(135px, 135px);
    transform: translate(135px, 135px); }
  .tile.tile-position-3-4 {
    -webkit-transform: translate(135px, 202px);
    -moz-transform: translate(135px, 202px);
    transform: translate(135px, 202px); }
  .tile.tile-position-4-1 {
    -webkit-transform: translate(202px, 0px);
    -moz-transform: translate(202px, 0px);
    transform: translate(202px, 0px); }
  .tile.tile-position-4-2 {
    -webkit-transform: translate(202px, 67px);
    -moz-transform: translate(202px, 67px);
    transform: translate(202px, 67px); }
  .tile.tile-position-4-3 {
    -webkit-transform: translate(202px, 135px);
    -moz-transform: translate(202px, 135px);
    transform: translate(202px, 135px); }
  .tile.tile-position-4-4 {
    -webkit-transform: translate(202px, 202px);
    -moz-transform: translate(202px, 202px);
    transform: translate(202px, 202px); }

  .tile .tile-inner {
    font-size: 35px; }

  .game-message {
    padding-top: 0; }
    .game-message p {
      font-size: 30px !important;
      height: 30px !important;
      line-height: 30px !important;
      margin-top: 32% !important;
      margin-bottom: 0 !important; }
    .game-message .lower {
      margin-top: 10px !important; }
    .game-message.game-won .score-sharing {
      margin-top: 10px; }
    .game-message.game-over .mailing-list {
      margin-top: 25px; }
    .game-message .mailing-list {
      margin-top: 10px; }
      .game-message .mailing-list .mailing-list-email-field {
        width: 180px; }

  .sharing > iframe, .sharing > span, .sharing > form {
    display: block;
    margin: 0 auto;
    margin-bottom: 20px; } }
.pp-donate button {
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
  border: none;
  font: inherit;
  color: inherit;
  display: inline-block;
  background: #8f7a66;
  border-radius: 3px;
  padding: 0 20px;
  text-decoration: none;
  color: #f9f6f2;
  height: 40px;
  line-height: 42px;
  cursor: pointer; }
  .pp-donate button img {
    vertical-align: -4px;
    margin-right: 8px; }

.btc-donate {
  position: relative;
  margin-left: 10px;
  display: inline-block;
  background: #8f7a66;
  border-radius: 3px;
  padding: 0 20px;
  text-decoration: none;
  color: #f9f6f2;
  height: 40px;
  line-height: 42px;
  cursor: pointer; }
  .btc-donate img {
    vertical-align: -4px;
    margin-right: 8px; }
  .btc-donate a {
    color: #f9f6f2;
    text-decoration: none;
    font-weight: normal; }
  .btc-donate .address {
    cursor: auto;
    position: absolute;
    width: 340px;
    right: 50%;
    margin-right: -170px;
    padding-bottom: 7px;
    top: -30px;
    opacity: 0;
    pointer-events: none;
    -webkit-transition: 400ms ease;
    -moz-transition: 400ms ease;
    transition: 400ms ease;
    -webkit-transition-property: top, opacity;
    -moz-transition-property: top, opacity;
    transition-property: top, opacity; }
    .btc-donate .address:after {
      position: absolute;
      border-top: 10px solid #bbada0;
      border-right: 7px solid transparent;
      border-left: 7px solid transparent;
      content: "";
      bottom: 0px;
      left: 50%;
      margin-left: -7px; }
    .btc-donate .address code {
      background-color: #bbada0;
      padding: 10px 15px;
      width: 100%;
      border-radius: 3px;
      line-height: 1;
      font-weight: normal;
      font-size: 15px;
      font-family: Consolas, "Liberation Mono", Courier, monospace;
      text-align: center; }
  .btc-donate:hover .address, .btc-donate .address:hover .address {
    opacity: 1;
    top: -45px;
    pointer-events: auto; }
  @media screen and (max-width: 480px) {
    .btc-donate {
      width: 120px; }
      .btc-donate .address {
        margin-right: -150px;
        width: 300px; }
        .btc-donate .address code {
          font-size: 13px; }
        .btc-donate .address:after {
          left: 50%;
          bottom: 2px; } }
!

JS 

              
                (function() {
  var lastTime = 0;
  var vendors = ['webkit', 'moz'];
  for(var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
    window.requestAnimationFrame = window[vendors[x]+'RequestAnimationFrame'];
    window.cancelAnimationFrame =
    window[vendors[x]+'CancelAnimationFrame'] || window[vendors[x]+'CancelRequestAnimationFrame'];
  }

  if (!window.requestAnimationFrame) {
    window.requestAnimationFrame = function(callback, element) {
      var currTime = new Date().getTime();
      var timeToCall = Math.max(0, 16 - (currTime - lastTime));
      var id = window.setTimeout(function() { callback(currTime + timeToCall); },
      timeToCall);
      lastTime = currTime + timeToCall;
      return id;
    };
  }

  if (!window.cancelAnimationFrame) {
    window.cancelAnimationFrame = function(id) {
      clearTimeout(id);
    };
  }
}());
// Wait till the browser is ready to render the game (avoids glitches)
window.requestAnimationFrame(function () {
  new GameManager(4, KeyboardInputManager, HTMLActuator, LocalStorageManager);
});
Function.prototype.bind = Function.prototype.bind || function (target) {
  var self = this;
  return function (args) {
    if (!(args instanceof Array)) {
      args = [args];
    }
    self.apply(target, args);
  };
};
  return cells;
};

Grid.prototype.fromState = function (state) {
  var cells = [];

  for (var x = 0; x < this.size; x++) {
    var row = cells[x] = [];

    for (var y = 0; y < this.size; y++) {
      var tile = state[x][y];
      row.push(tile ? new Tile(tile.position, tile.value) : null);
    }
  }

  return cells;
};

// Find the first available random position
Grid.prototype.randomAvailableCell = function () {
  var cells = this.availableCells();

  if (cells.length) {
    return cells[Math.floor(Math.random() * cells.length)];
  }
};

Grid.prototype.availableCells = function () {
  var cells = [];

  this.eachCell(function (x, y, tile) {
    if (!tile) {
      cells.push({ x: x, y: y });
    }
  });

  return cells;
};

// Call callback for every cell
Grid.prototype.eachCell = function (callback) {
  for (var x = 0; x < this.size; x++) {
    for (var y = 0; y < this.size; y++) {
      callback(x, y, this.cells[x][y]);
    }
  }
};

// Check if there are any cells available
Grid.prototype.cellsAvailable = function () {
  return !!this.availableCells().length;
};

// Check if the specified cell is taken
Grid.prototype.cellAvailable = function (cell) {
  return !this.cellOccupied(cell);
};

Grid.prototype.cellOccupied = function (cell) {
  return !!this.cellContent(cell);
};

Grid.prototype.cellContent = function (cell) {
  if (this.withinBounds(cell)) {
    return this.cells[cell.x][cell.y];
  } else {
    return null;
  }
};

// Inserts a tile at its position
Grid.prototype.insertTile = function (tile) {
  this.cells[tile.x][tile.y] = tile;
};

Grid.prototype.removeTile = function (tile) {
  this.cells[tile.x][tile.y] = null;
};

Grid.prototype.withinBounds = function (position) {
  return position.x >= 0 && position.x < this.size &&
         position.y >= 0 && position.y < this.size;
};

Grid.prototype.serialize = function () {
  var cellState = [];

  for (var x = 0; x < this.size; x++) {
    var row = cellState[x] = [];

    for (var y = 0; y < this.size; y++) {
      row.push(this.cells[x][y] ? this.cells[x][y].serialize() : null);
    }
  }

  return {
    size: this.size,
    cells: cellState
  };
};
!
999px

Console