diff --git a/head.php b/head.php
index bb624cf..ab48b17 100644
--- a/head.php
+++ b/head.php
@@ -7,26 +7,26 @@
 <link href="https://cdn.jsdelivr.net/npm/bootstrap-dark-5@1.1.3/dist/css/bootstrap-night.min.css" rel="alternate stylesheet" type="text/css" title="Sombre" />
 <link href="https://cdn.jsdelivr.net/npm/remixicon@3.2.0/fonts/remixicon.css" rel="stylesheet">
 <link rel="stylesheet" type="text/css" href="css/style.css" />
-<link rel="apple-touch-icon" href="thumbnail.php?size=57" sizes="57x57">
-<link rel="apple-touch-icon" href="thumbnail.php?size=114" sizes="114x114">
-<link rel="apple-touch-icon" href="thumbnail.php?size=72" sizes="72x72">
-<link rel="apple-touch-icon" href="thumbnail.php?size=144" sizes="144x144">
-<link rel="apple-touch-icon" href="thumbnail.php?size=60" sizes="60x60">
-<link rel="apple-touch-icon" href="thumbnail.php?size=120" sizes="120x120">
-<link rel="apple-touch-icon" href="thumbnail.php?size=76" sizes="76x76">
-<link rel="apple-touch-icon" href="thumbnail.php?size=152" sizes="152x152">
-<link rel="icon" type="image/png" href="thumbnail.php?size=196" sizes="196x196">
-<link rel="icon" type="image/png" href="thumbnail.php?size=160" sizes="160x160">
-<link rel="icon" type="image/png" href="thumbnail.php?size=96" sizes="96x96">
-<link rel="icon" type="image/png" href="thumbnail.php?size=16" sizes="16x16">
-<link rel="icon" type="image/png" href="thumbnail.php?size=32" sizes="32x32">
-<link rel="manifest" href="manifest.php">
+<link rel="apple-touch-icon" href="thumbnail.php?size=57&grid=<?=$currentGrid?>" sizes="57x57">
+<link rel="apple-touch-icon" href="thumbnail.php?size=114&grid=<?=$currentGrid?>" sizes="114x114">
+<link rel="apple-touch-icon" href="thumbnail.php?size=72&grid=<?=$currentGrid?>" sizes="72x72">
+<link rel="apple-touch-icon" href="thumbnail.php?size=144&grid=<?=$currentGrid?>" sizes="144x144">
+<link rel="apple-touch-icon" href="thumbnail.php?size=60&grid=<?=$currentGrid?>" sizes="60x60">
+<link rel="apple-touch-icon" href="thumbnail.php?size=120&grid=<?=$currentGrid?>" sizes="120x120">
+<link rel="apple-touch-icon" href="thumbnail.php?size=76&grid=<?=$currentGrid?>" sizes="76x76">
+<link rel="apple-touch-icon" href="thumbnail.php?size=152&grid=<?=$currentGrid?>" sizes="152x152">
+<link rel="icon" type="image/png" href="thumbnail.php?size=196&grid=<?=$currentGrid?>" sizes="196x196">
+<link rel="icon" type="image/png" href="thumbnail.php?size=160&grid=<?=$currentGrid?>" sizes="160x160">
+<link rel="icon" type="image/png" href="thumbnail.php?size=96&grid=<?=$currentGrid?>" sizes="96x96">
+<link rel="icon" type="image/png" href="thumbnail.php?size=16&grid=<?=$currentGrid?>" sizes="16x16">
+<link rel="icon" type="image/png" href="thumbnail.php?size=32&grid=<?=$currentGrid?>" sizes="32x32">
+<link rel="manifest" href="manifest.php?grid=<?=$currentGrid?>">
 <meta property="og:title" content="Sudoku" />
 <meta property="og:type" content="website" />
 <meta property="og:url"
     content="<?=$_SERVER["REQUEST_SCHEME"]."://".$_SERVER["HTTP_HOST"].$_SERVER["DOCUMENT_URI"]?>" />
 <meta property="og:image"
-    content="<?=$_SERVER["REQUEST_SCHEME"]."://".$_SERVER["HTTP_HOST"].dirname($_SERVER["DOCUMENT_URI"])?>/thumbnail.php?size=200" />
+    content="<?=$_SERVER["REQUEST_SCHEME"]."://".$_SERVER["HTTP_HOST"].dirname($_SERVER["DOCUMENT_URI"])?>/thumbnail.php?size=200&grid=<?=$currentGrid?>" />
 <meta property="og:image:width" content="200" />
 <meta property="og:image:height" content="200" />
 <meta property="og:description"
diff --git a/manifest.php b/manifest.php
index 6e43c5b..1dc9c24 100644
--- a/manifest.php
+++ b/manifest.php
@@ -1,7 +1,6 @@
 <?php
-    session_start();
-    if (isset($_SESSION["currentGrid"]))
-        $currentGrid = $_SESSION["currentGrid"];
+    if (isset($_GET["grid"]))
+        $currentGrid = $_GET["grid"];
     else
         $currentGrid = ".";
 ?>
@@ -10,27 +9,27 @@
     "name": "Sudoku",
     "description": "Remplissez la grille de sorte que chaque ligne, colonne et région (carré de 3×3 cases) contienne tous les chiffres de 1 à 9.",
     "icons": [{
-        "src": "thumbnail.php?size=48",
+        "src": "thumbnail.php?size=48&grid=<?=$currentGrid?>",
         "sizes": "48x48",
         "type": "image/png"
     }, {
-        "src": "thumbnail.php?size=72",
+        "src": "thumbnail.php?size=72&grid=<?=$currentGrid?>",
         "sizes": "72x72",
         "type": "image/png"
     }, {
-        "src": "thumbnail.php?size=96",
+        "src": "thumbnail.php?size=96&grid=<?=$currentGrid?>",
         "sizes": "96x96",
         "type": "image/png"
     }, {
-        "src": "thumbnail.php?size=144",
+        "src": "thumbnail.php?size=144&grid=<?=$currentGrid?>",
         "sizes": "144x144",
         "type": "image/png"
     }, {
-        "src": "thumbnail.php?size=168",
+        "src": "thumbnail.php?size=168&grid=<?=$currentGrid?>",
         "sizes": "168x168",
         "type": "image/png"
     }, {
-        "src": "thumbnail.php?size=192",
+        "src": "thumbnail.php?size=192&grid=<?=$currentGrid?>",
         "sizes": "192x192",
         "type": "image/png"
     }],
@@ -47,27 +46,27 @@
             "description": "Continuer cette grille de sudoku",
             "url": "<?=$currentGrid?>",
             "icons": [{
-                    "src": "thumbnail.php?size=48",
+                    "src": "thumbnail.php?size=48&grid=<?=$currentGrid?>",
                     "sizes": "48x48",
                     "type": "image/png"
                 }, {
-                    "src": "thumbnail.php?size=72",
+                    "src": "thumbnail.php?size=72&grid=<?=$currentGrid?>",
                     "sizes": "72x72",
                     "type": "image/png"
                 }, {
-                    "src": "thumbnail.php?size=96",
+                    "src": "thumbnail.php?size=96&grid=<?=$currentGrid?>",
                     "sizes": "96x96",
                     "type": "image/png"
                 }, {
-                    "src": "thumbnail.php?size=144",
+                    "src": "thumbnail.php?size=144&grid=<?=$currentGrid?>",
                     "sizes": "144x144",
                     "type": "image/png"
                 }, {
-                    "src": "thumbnail.php?size=168",
+                    "src": "thumbnail.php?size=168&grid=<?=$currentGrid?>",
                     "sizes": "168x168",
                     "type": "image/png"
                 }, {
-                    "src": "thumbnail.php?size=192",
+                    "src": "thumbnail.php?size=192&grid=<?=$currentGrid?>",
                     "sizes": "192x192",
                     "type": "image/png"
             }]
@@ -78,27 +77,27 @@
             "description": "Grille de sudoku vierge",
             "url": ".................................................................................",
             "icons": [{
-                    "src": "thumbnail.php?size=48",
+                    "src": "thumbnail.php?size=48&grid=<?=$currentGrid?>",
                     "sizes": "48x48",
                     "type": "image/png"
                 }, {
-                    "src": "thumbnail.php?size=72",
+                    "src": "thumbnail.php?size=72&grid=<?=$currentGrid?>",
                     "sizes": "72x72",
                     "type": "image/png"
                 }, {
-                    "src": "thumbnail.php?size=96",
+                    "src": "thumbnail.php?size=96&grid=<?=$currentGrid?>",
                     "sizes": "96x96",
                     "type": "image/png"
                 }, {
-                    "src": "thumbnail.php?size=144",
+                    "src": "thumbnail.php?size=144&grid=<?=$currentGrid?>",
                     "sizes": "144x144",
                     "type": "image/png"
                 }, {
-                    "src": "thumbnail.php?size=168",
+                    "src": "thumbnail.php?size=168&grid=<?=$currentGrid?>",
                     "sizes": "168x168",
                     "type": "image/png"
                 }, {
-                    "src": "thumbnail.php?size=192",
+                    "src": "thumbnail.php?size=192&grid=<?=$currentGrid?>",
                     "sizes": "192x192",
                     "type": "image/png"
             }]
@@ -109,27 +108,27 @@
             "description": "Nouvelle grille de sudoku",
             "url": ".",
             "icons": [{
-                    "src": "thumbnail.php?size=48",
+                    "src": "thumbnail.php?size=48&grid=<?=$currentGrid?>",
                     "sizes": "48x48",
                     "type": "image/png"
                 }, {
-                    "src": "thumbnail.php?size=72",
+                    "src": "thumbnail.php?size=72&grid=<?=$currentGrid?>",
                     "sizes": "72x72",
                     "type": "image/png"
                 }, {
-                    "src": "thumbnail.php?size=96",
+                    "src": "thumbnail.php?size=96&grid=<?=$currentGrid?>",
                     "sizes": "96x96",
                     "type": "image/png"
                 }, {
-                    "src": "thumbnail.php?size=144",
+                    "src": "thumbnail.php?size=144&grid=<?=$currentGrid?>",
                     "sizes": "144x144",
                     "type": "image/png"
                 }, {
-                    "src": "thumbnail.php?size=168",
+                    "src": "thumbnail.php?size=168&grid=<?=$currentGrid?>",
                     "sizes": "168x168",
                     "type": "image/png"
                 }, {
-                    "src": "thumbnail.php?size=192",
+                    "src": "thumbnail.php?size=192&grid=<?=$currentGrid?>",
                     "sizes": "192x192",
                     "type": "image/png"
             }]
diff --git a/thumbnail.php b/thumbnail.php
index 12f1255..a5a2094 100644
--- a/thumbnail.php
+++ b/thumbnail.php
@@ -1,8 +1,7 @@
 <?php
     require("classes.php");
-    session_start();
-    if (isset($_SESSION["currentGrid"]))
-        $currentGrid = $_SESSION["currentGrid"];
+    if (isset($_GET["grid"]))
+        $currentGrid = $_GET["grid"];
     else
         $currentGrid = ".528.3....4.9.1...39.562......73.129...1.64.7...42.3656.13.5...28.6.4...4.5287...";
     header ("Content-type: image/png");