diff --git a/scripts/indexnow.mjs b/scripts/indexnow.mjs
index 1139650..06cc26d 100644
--- a/scripts/indexnow.mjs
+++ b/scripts/indexnow.mjs
@@ -12,14 +12,19 @@ if (!key) {
 }
 
 const host = "unblocked-games.vercel.app";
+const locs = (xml) =>
+  [...xml.matchAll(/<loc>([^<]+)<\/loc>/g)].map((m) => m[1]);
 let urls = [];
 try {
-  const xml = readFileSync("dist/sitemap.xml", "utf8");
-  urls = [...xml.matchAll(/<loc>([^<]+)<\/loc>/g)]
-    .map((m) => m[1])
-    .slice(0, 10000);
+  // ponytail: astro emits sitemap-index.xml + sitemap-N.xml, never sitemap.xml
+  const index = readFileSync("dist/sitemap-index.xml", "utf8");
+  const children = locs(index).map((u) => u.split("/").pop());
+  for (const file of children) {
+    urls.push(...locs(readFileSync(`dist/${file}`, "utf8")));
+  }
+  urls = urls.slice(0, 10000);
 } catch {
-  console.log("IndexNow: dist/sitemap.xml not found, run build first.");
+  console.log("IndexNow: dist/sitemap-index.xml not found, run build first.");
   process.exit(1);
 }
 
diff --git a/src/components/flash.astro b/src/components/flash.astro
index 1ccd4e6..bf4d170 100644
--- a/src/components/flash.astro
+++ b/src/components/flash.astro
@@ -83,6 +83,9 @@ const { gamePath } = Astro.props;
         var headerOffset = isFs ? 56 : 120;
         var maxW = isFs ? vw : Math.min(vw - pad * 2, 1040);
         var maxH = vh - headerOffset - pad * 2;
+        // ponytail: clamp so short viewports never yield negative px sizes
+        maxW = Math.max(200, maxW);
+        maxH = Math.max(200, maxH);
         var w = maxW;
         var h = w / ASPECT_RATIO;
         if (h > maxH) {
@@ -114,6 +117,10 @@ const { gamePath } = Astro.props;
     function ready() {
       if (destroyed) return;
       // ponytail: fail fast on script 404/offline, keep polling for slow networks
+      if (!GAME_PATH) {
+        showError("Game not available.");
+        return;
+      }
       if (window.__ruffleFailed) {
         showError("Failed to load Flash player. Please refresh the page.");
         return;
diff --git a/src/layout/layout.astro b/src/layout/layout.astro
index d72c775..3a65c54 100644
--- a/src/layout/layout.astro
+++ b/src/layout/layout.astro
@@ -47,10 +47,12 @@ const gameYear = seo?.year || "";
 const pageUrl = slug ? `${siteUrl}/games/${slug}` : siteUrl;
 
 // More Games cross-linking — same genre first, then fill from popular
-// ponytail: two passes over defaultGames, no new data structures
+// ponytail: two passes over knownGames, no new data structures
+// ponytail: drop unknown slugs so one stale entry can't crash every page
+const knownGames = defaultGames.filter((s) => gamesMap[s]);
 const moreGames = (() => {
-  if (!slug || !seo) return defaultGames.slice(0, MORE_GAMES_COUNT);
-  const rest = defaultGames.filter((s) => s !== slug);
+  if (!slug || !seo) return knownGames.slice(0, MORE_GAMES_COUNT);
+  const rest = knownGames.filter((s) => s !== slug);
   return [
     ...rest.filter((s) => gamesMap[s].genre === seo.genre),
     ...rest.filter((s) => gamesMap[s].genre !== seo.genre),
@@ -346,7 +348,7 @@ const moreGames = (() => {
         sync();
       })();
     </script>
-    <script is:inline define:vars={{ slugs: defaultGames }}>
+    <script is:inline define:vars={{ slugs: knownGames }}>
       // ponytail: static build, so pick random client-side
       document.addEventListener("click", function (e) {
         var b = e.target && e.target.closest ? e.target.closest("#random-game") : null;
diff --git a/src/pages/games/[slug].astro b/src/pages/games/[slug].astro
index cdf444e..9f9b841 100644
--- a/src/pages/games/[slug].astro
+++ b/src/pages/games/[slug].astro
@@ -8,8 +8,11 @@ export async function getStaticPaths() {
   return Object.keys(gamesMap).map((slug) => ({ params: { slug } }));
 }
 
-const { slug } = Astro.params!;
-const seo = gamesMap[slug];
+const { slug } = Astro.params;
+const seo = slug ? gamesMap[slug] : undefined;
+if (!seo) {
+  return new Response(null, { status: 404, statusText: "Not Found" });
+}
 ---
 
 <Layout slug={slug}>
diff --git a/src/pages/index.astro b/src/pages/index.astro
index e30ac8c..55307d0 100644
--- a/src/pages/index.astro
+++ b/src/pages/index.astro
@@ -6,7 +6,8 @@ import { gamesMap, defaultGames, POPULAR_COUNT } from "../data/game-seo";
 const pageTitle =
   "Superfun Games - Unblocked Games for School Chromebook | No Flash Required (2026)";
 
-const popularGames = defaultGames.slice(0, POPULAR_COUNT);
+const knownGames = defaultGames.filter((s) => gamesMap[s]);
+const popularGames = knownGames.slice(0, POPULAR_COUNT);
 ---
 
 <Layout pageTitle={pageTitle} isHome={true}>
@@ -61,7 +62,7 @@ const popularGames = defaultGames.slice(0, POPULAR_COUNT);
     </div>
     <hr class="mx-5 my-4 border-gray-400 dark:border-neutral-700" />
   </section>
-  <script is:inline define:vars={{ valid: defaultGames }}>
+    <script is:inline define:vars={{ valid: knownGames }}>
     (function () {
       try {
         var r = JSON.parse(localStorage.getItem("recently-played") || "[]");
@@ -97,7 +98,7 @@ const popularGames = defaultGames.slice(0, POPULAR_COUNT);
   <h2 class="sr-only">All unblocked games</h2>
   <div class="grid grid-cols-[repeat(auto-fill,minmax(min(100%,280px),1fr))] gap-[10px]">
     {
-      defaultGames.map((slug) => {
+      knownGames.map((slug) => {
         const seo = gamesMap[slug];
         return (
           <Gametile