update screenshot in README
update screenshot in README

file:a/README.md -> file:b/README.md
--- a/README.md
+++ b/README.md
@@ -3,5 +3,5 @@
 
 Made just for fun.
 
-[![Screenshot](http://pictures.gabrielecirulli.com/2048-20140305-170629.png)](http://pictures.gabrielecirulli.com/2048-20140305-170629.png)
+[![Screenshot](http://pictures.gabrielecirulli.com/2048-20140305-231246.png)](http://pictures.gabrielecirulli.com/2048-20140305-231246.png)
 

file:a/index.html -> file:b/index.html
--- a/index.html
+++ b/index.html
@@ -9,6 +9,7 @@
 <body>
   <div class="container">
     <h1>2048</h1>
+    <p class="game-intro">Join the numbers and get to the <strong>2048 tile!</strong></p>
 
     <div class="game-container">
       <div class="grid-container">
@@ -42,38 +43,25 @@
         <div class="tile tile-2 tile-position-1-1">
           2
         </div>
-        <div class="tile tile-4 tile-position-2-1">
-          4
-        </div>
-        <div class="tile tile-8 tile-position-3-1">
-          8
-        </div>
-        <div class="tile tile-16 tile-position-4-1">
-          16
-        </div>
-        <div class="tile tile-32 tile-position-1-2">
-          32
-        </div>
-        <div class="tile tile-64 tile-position-2-2">
-          64
-        </div>
-        <div class="tile tile-128 tile-position-3-2">
-          128
-        </div>
-        <div class="tile tile-256 tile-position-4-2">
-          256
-        </div>
-        <div class="tile tile-512 tile-position-1-3">
-          512
-        </div>
-        <div class="tile tile-1024 tile-position-2-3">
-          1024
-        </div>
-        <div class="tile tile-2048 tile-position-3-3">
-          2048
-        </div>
+         <div class="tile tile-4 tile-position-2-3">
+            4
+          </div>
+          <div class="tile tile-512 tile-position-3-2">
+            512
+          </div>
+          <div class="tile tile-2048 tile-position-4-4">
+            2048
+          </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>
+      Created by <a href="http://gabrielecirulli.com" target="_blank">Gabriele Cirulli.</a> Based on <a href="https://itunes.apple.com/us/app/1024!/id823499224" target="_blank">1024 by Veewo Studio.</a>
+    </p>
   </div>
 </body>
 </html>

--- a/style/main.css
+++ b/style/main.css
@@ -4,7 +4,8 @@
   padding: 0;
   background: #faf8ef;
   color: #776e65;
-  font-family: "Clear Sans", "Helvetica Neue", Arial, sans-serif; }
+  font-family: "Clear Sans", "Helvetica Neue", Arial, sans-serif;
+  font-size: 18px; }
 
 body {
   margin: 80px 0; }
@@ -14,12 +15,31 @@
   font-weight: bold;
   margin: 0; }
 
+p {
+  margin-top: 0;
+  margin-bottom: 10px;
+  line-height: 1.65; }
+
+a {
+  color: #776e65;
+  font-weight: bold;
+  text-decoration: underline; }
+
+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; }
 
 .game-container {
-  margin-top: 50px;
+  margin-top: 40px;
   position: relative;
   padding: 15px;
   cursor: default;
@@ -144,39 +164,50 @@
     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 {
-    background: #edddb7;
+    color: #f9f6f2;
+    background: #f2b179;
     box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0), inset 0 0 0 1px rgba(255, 255, 255, 0); }
   .tile.tile-16 {
-    background: #edd9a6;
+    color: #f9f6f2;
+    background: #f59563;
     box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0), inset 0 0 0 1px rgba(255, 255, 255, 0); }
   .tile.tile-32 {
-    background: #edd695;
-    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0.09524), inset 0 0 0 1px rgba(255, 255, 255, 0.04762); }
+    color: #f9f6f2;
+    background: #f67c5f;
+    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0.07937), inset 0 0 0 1px rgba(255, 255, 255, 0.04762); }
   .tile.tile-64 {
-    background: #edd384;
-    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0.19048), inset 0 0 0 1px rgba(255, 255, 255, 0.09524); }
+    color: #f9f6f2;
+    background: #f65e3b;
+    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0.15873), inset 0 0 0 1px rgba(255, 255, 255, 0.09524); }
   .tile.tile-128 {
+    color: #f9f6f2;
     background: #edcf72;
-    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0.28571), inset 0 0 0 1px rgba(255, 255, 255, 0.14286);
+    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; }
   .tile.tile-256 {
+    color: #f9f6f2;
     background: #edcc61;
-    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0.38095), inset 0 0 0 1px rgba(255, 255, 255, 0.19048);
-    color: #ede9e5;
+    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; }
   .tile.tile-512 {
+    color: #f9f6f2;
     background: #edc850;
-    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0.47619), inset 0 0 0 1px rgba(255, 255, 255, 0.2381);
-    color: #f9f6f2;
+    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; }
   .tile.tile-1024 {
+    color: #f9f6f2;
     background: #edc53f;
-    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0.57143), inset 0 0 0 1px rgba(255, 255, 255, 0.28571);
-    color: #f9f6f2;
+    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; }
   .tile.tile-2048 {
+    color: #f9f6f2;
     background: #edc22e;
-    box-shadow: 0 0 30px 10px rgba(243, 215, 116, 0.66667), inset 0 0 0 1px rgba(255, 255, 255, 0.33333);
-    color: #f9f6f2;
+    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; }
 
+.game-intro {
+  margin-bottom: 0; }
+
+.game-explanation {
+  margin-top: 50px; }
+

--- a/style/main.scss
+++ b/style/main.scss
@@ -8,7 +8,7 @@
 $tile-border-radius: 3px;
 
 $text-color: #776E65;
-$gold-text-color: #f9f6f2;
+$bright-text-color: #f9f6f2;
 
 $tile-color: #eee4da;
 $tile-gold-color: #edc22e;
@@ -21,6 +21,7 @@
   background: #faf8ef;
   color: $text-color;
   font-family: "Clear Sans", "Helvetica Neue", Arial, sans-serif;
+  font-size: 18px;
 }
 
 body {
@@ -33,13 +34,38 @@
   margin: 0;
 }
 
+p {
+  margin-top: 0;
+  margin-bottom: 10px;
+  line-height: 1.65;
+}
+
+a {
+  color: $text-color;
+  font-weight: bold;
+  text-decoration: underline;
+}
+
+strong {
+  &.important {
+    text-transform: uppercase;
+  }
+}
+
+hr {
+  border: none;
+  border-bottom: 1px solid lighten($text-color, 40%);
+  margin-top: 20px;
+  margin-bottom: 30px;
+}
+
 .container {
   width: $field-width;
   margin: 0 auto;
 }
 
 .game-container {
-  margin-top: 50px;
+  margin-top: 40px;
   position: relative;
   padding: $grid-spacing;
 
@@ -109,6 +135,7 @@
   @include transition(200ms ease);
   @include transition-property(top, left);
 
+  // Build position classes
   @for $x from 1 through $grid-row-cells {
     @for $y from 1 through $grid-row-cells {
       &.tile-position-#{$x}-#{$y} {
@@ -123,25 +150,50 @@
   $exponent: 1;
   $limit: 11;
 
+  // Colors for all 11 states, false = no special color
+  $special-colors: false false, // 2
+                   false false, // 4
+                   #f78e48 true, // 8
+                   #fc5e2e true, // 16
+                   #ff3333 true, // 32
+                   #ff0000 true, // 64
+                   false true, // 128
+                   false true, // 256
+                   false true, // 512
+                   false true, // 1024
+                   false true; // 2048
+
+  // Build tile colors
   @while $exponent <= $limit {
     $power: pow($base, $exponent);
 
-    $gold-percent: ($exponent - 1) / ($limit - 1) * 100;
-
-    $gold-text-percent: min($exponent + 2, $limit) / ($limit) * 100;
-
-    $glow-opacity: max($exponent - 4, 0) / ($limit - 4);
-
     &.tile-#{$power} {
-      background: mix($tile-gold-color, $tile-color, $gold-percent);
-
-      box-shadow: 0 0 30px 10px rgba($tile-gold-glow-color, $glow-opacity / 1.5),
+      // Calculate base background color
+      $gold-percent: ($exponent - 1) / ($limit - 1) * 100;
+      $mixed-background: mix($tile-gold-color, $tile-color, $gold-percent);
+
+      $nth-color: nth($special-colors, $exponent);
+
+      $special-background: nth($nth-color, 1);
+      $bright-color: nth($nth-color, 2);
+
+      @if $special-background {
+        $mixed-background: mix($special-background, $mixed-background, 55%);
+      }
+
+      @if $bright-color {
+        color: $bright-text-color;
+      }
+
+      // Set background
+      background: $mixed-background;
+
+      // Add glow
+      $glow-opacity: max($exponent - 4, 0) / ($limit - 4);
+      box-shadow: 0 0 30px 10px rgba($tile-gold-glow-color, $glow-opacity / 1.8),
                   inset 0 0 0 1px rgba(white, $glow-opacity / 3);
 
-      @if $exponent >= 8 {
-        color: mix($gold-text-color, $text-color, $gold-text-percent);
-      }
-
+      // Adjust font size for bigger numbers
       @if $power >= 100 and $power < 1000 {
         font-size: 45px;
       } @else if $power >= 1000 {
@@ -153,5 +205,11 @@
   }
 }
 
-
-
+.game-intro {
+  margin-bottom: 0;
+}
+
+.game-explanation {
+  margin-top: 50px;
+}
+

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