Fix "Back to Puzzles" link

Ensure "Back to Puzzles" link is displayed correctly on the pebble placement interactive page when accessed via the puzzles section.

src/pages/PebblePlacementGamePage.tsx

@@ -1,6 +1,28 @@
 import PebblePlacementGame from "@/components/PebblePlacementGame";
+import { useSearchParams } from "react-router-dom";
 
 const PebblePlacementGamePage = () => {
+  const [searchParams] = useSearchParams();
+  const from = searchParams.get('from');
+
+  if (from === 'puzzles') {
+    return (
+      <div className="min-h-screen bg-background">
+        <div className="container mx-auto px-4 py-8 space-y-6">
+          <div className="flex items-center gap-4">
+            <button 
+              onClick={() => window.location.href = '/themes/puzzles'}
+              className="text-primary hover:text-primary/80 font-medium"
+            >
+              ← Back to Puzzles
+            </button>
+          </div>
+          <PebblePlacementGame showSocialShare={true} />
+        </div>
+      </div>
+    );
+  }
+
   return <PebblePlacementGame showSocialShare={true} />;
 };