diff --git a/favicon.php b/favicon.php
new file mode 100644
index 0000000..47c5879
--- /dev/null
+++ b/favicon.php
@@ -0,0 +1,61 @@
+<?php
+    header ("Content-type: image/png");
+    const UNKNOWN = ".";
+    $gridStr = strip_tags($_GET['grid']);
+    $size = (int) $_GET['size'];
+    $icon = imagecreate($size, $size);
+    $transparent = imagecolorallocate($icon, 1, 1, 1);
+    imagecolortransparent($icon, $transparent);
+    $gridBorder = imagecolorallocate($icon, 0, 0, 0);
+    $known = imagecolorallocate($icon, 102, 102, 255);
+    $unknown = imagecolorallocate($icon, 255, 255, 255);
+    
+    if ($size == 16) {
+        ImageLine($icon,  2,  1, 12,  1, $gridBorder);
+        ImageLine($icon,  2,  5, 12,  5, $gridBorder);
+        ImageLine($icon,  2,  9, 12,  9, $gridBorder);
+        ImageLine($icon,  2, 13, 12, 13, $gridBorder);
+        ImageLine($icon,  1,  2,  1, 12, $gridBorder);
+        ImageLine($icon,  5,  2,  5, 12, $gridBorder);
+        ImageLine($icon,  9,  2,  9, 12, $gridBorder);
+        ImageLine($icon, 13,  2, 13, 12, $gridBorder);
+        $x = 1;
+        $y = 0;
+        foreach(str_split($gridStr) as $i => $value) {
+            $x++;
+            if ($i % 3 == 0) $x++;
+            if ($i % 9 == 0) {
+                $y++;
+                $x = 2;
+            }
+            if ($i % 27 == 0) $y++;
+            if ($value == UNKNOWN) $pixelColor = $unknown;
+            else $pixelColor = $known;
+            ImageSetPixel($icon, $x, $y, $pixelColor);
+        }
+    } else {
+        $boxSize = floor(($size-5) / 9);
+        $start = 1;
+        $end = 9*$boxSize + 2;
+        for ($y=0; $y < $size; $y += 3*$boxSize + 1)
+            ImageLine($icon,  $start,  $y, $end,  $y, $gridBorder);
+        for ($x=0; $x < $size; $x += 3*$boxSize +1)
+            ImageLine($icon,  $x,  $start,  $x, $end, $gridBorder);
+        $x = 0;
+        $y = 0;
+        $boxSizeMinusOne = $boxSize - 1;
+        foreach(str_split($gridStr) as $i => $value) {
+            if ($i % 3 == 0) $x++;
+            if ($i % 27 == 0) $y++;
+            if ($value == UNKNOWN) $color = $unknown;
+            else $color = $known;
+            imagefilledrectangle($icon, $x, $y, $x+$boxSizeMinusOne, $y+$boxSizeMinusOne, $color);
+            $x += $boxSize;
+            if ($i % 9 == 8) {
+                $y += $boxSize;
+                $x = 0;
+            }
+        }
+    }
+    imagepng($icon);
+?>
diff --git a/game.php b/game.php
index 7c23ae5..3e2e95a 100644
--- a/game.php
+++ b/game.php
@@ -13,7 +13,8 @@
         <title>Sudoku</title>
         <link rel='stylesheet' type='text/css' href='style.css' />
         <script src='app.js'></script>
-        <link rel="icon" type="image/png" href="favicon.png">
+        <link rel="icon" type="image/png" href="favicon.php?size=16&grid=<?=$gridStr?>" sizes="16x16">
+        <link rel="icon" type="image/png" href="favicon.php?size=32&grid=<?=$gridStr?>" sizes="32x32">
     </head>
     <body>
         <header>
@@ -102,12 +103,13 @@
         $urlExample = $urlDir . "/" . $grid->toString();
 ?>
 <!DOCTYPE html>
-<html>
+<html lang='fr'>
     <head>
         <meta charset='utf-8' />
         <meta name='viewport' content='width=device-width' />
         <title>Grille incorrecte</title>
         <link rel='stylesheet' type='text/css' href='style.css' />
+        <link rel="icon" type="image/png" href="favicon.png">
     </head>
     <body>
         <header>
