diff --git a/index.html b/index.html
index d7601f2..fdd42f3 100644
--- a/index.html
+++ b/index.html
@@ -527,5 +527,6 @@ With the recent trend of internet censorship I have been thinking about alternat
     <script src="javascript/carousel.js"></script>
     <script src="javascript/view-counter.js"></script>
     <script src="javascript/nav-music.js"></script>
+    <script src="javascript/legacy-check.js"
   </body>
 </html>
diff --git a/javascript/legacy-check.js b/javascript/legacy-check.js
new file mode 100644
index 0000000..65a618f
--- /dev/null
+++ b/javascript/legacy-check.js
@@ -0,0 +1,39 @@
+// legacy-redirect.js
+
+(function () {
+    const legacyURL = "http://www.veltron.net/legacy.html";
+
+    const ua = navigator.userAgent || "";
+
+    // --- Target DSi / 3DS specifically ---
+    const isDSiOr3DS =
+    ua.includes("Nintendo DSi") ||
+    ua.includes("Nintendo 3DS");
+
+    // --- Optional broader legacy browser checks ---
+    const isOldIE =
+    ua.includes("MSIE") || ua.includes("Trident/");
+
+    const isOperaMini =
+    ua.includes("Opera Mini");
+
+    // Very old / limited mobile browsers fallback (optional)
+    const isVeryOldMobile =
+    /Android 2|Android 3|Symbian|webOS|BlackBerry/i.test(ua);
+
+    // Combine rules
+    const isLegacyBrowser =
+    isDSiOr3DS || isOldIE || isOperaMini || isVeryOldMobile;
+
+    // Prevent redirect loop
+    const alreadyOnLegacy =
+    window.location.href.startsWith(legacyURL);
+
+    // Optional override (useful for testing)
+    const bypass =
+    new URLSearchParams(window.location.search).has("noredirect");
+
+    if (isLegacyBrowser && !alreadyOnLegacy && !bypass) {
+        window.location.href = legacyURL;
+    }
+})();