diff --git a/src/components/NavBar.astro b/src/components/NavBar.astro
index 5b7c442..916bf0b 100644
--- a/src/components/NavBar.astro
+++ b/src/components/NavBar.astro
@@ -3,5 +3,5 @@ export interface Props { showBack?: boolean; }
 const { showBack = true } = Astro.props;
 ---
 <div class="nav-bar">
-  {showBack && <a href="#" onclick="event.preventDefault(); history.back();">[B] Back</a>}
+  {showBack && <a href="/bbs/">[B] Back to Main Menu</a>}
 </div>
diff --git a/src/components/TerminalShell.tsx b/src/components/TerminalShell.tsx
index 354d62c..486c337 100644
--- a/src/components/TerminalShell.tsx
+++ b/src/components/TerminalShell.tsx
@@ -7,7 +7,6 @@ export default function TerminalShell({ children }: { children?: React.ReactNode
       if (e.metaKey || e.ctrlKey || e.altKey) return;
       const entry = findKeyEntry(e.key);
       if (!entry) return;
-      if (entry.href === 'back') { window.history.back(); return; }
       if (entry.href === 'disconnect') { resetConnected(); window.location.href = '/'; return; }
       window.location.href = entry.href;
     }
diff --git a/src/lib/keymap.ts b/src/lib/keymap.ts
index 55e0220..a00d64a 100644
--- a/src/lib/keymap.ts
+++ b/src/lib/keymap.ts
@@ -1,6 +1,6 @@
 export type KeymapEntry = { key: string; href: string; label: string };
 export const GLOBAL_NAV_KEYS: KeymapEntry[] = [
-  { key: 'B', href: 'back', label: 'Back' },
+  { key: 'B', href: '/bbs/', label: 'Back to Main Menu' },
   { key: 'Q', href: 'disconnect', label: 'Disconnect' },
   { key: 'I', href: '/bbs/legal-notice', label: 'Legal Notice' },
 ];
diff --git a/src/pages/404.astro b/src/pages/404.astro
new file mode 100644
index 0000000..f3b8d18
--- /dev/null
+++ b/src/pages/404.astro
@@ -0,0 +1,33 @@
+---
+import TerminalLayout from '../layouts/TerminalLayout.astro';
+import StatusBar from '../components/StatusBar.astro';
+import LetterFooter from '../components/LetterFooter.astro';
+const W = 50;
+const hr = '\u2550'.repeat(W - 2);
+const sp = (n: number) => ' '.repeat(n);
+const pad = (textLen: number) => sp(W - 4 - textLen);
+const box = `<span class="c-main-red">\u2554${hr}\u2557
+\u2551${sp(W - 2)}\u2551
+\u2551  <span class="c-white">*** ERROR 404 ***</span>${pad(17)}\u2551
+\u2551${sp(W - 2)}\u2551
+\u2551  <span class="c-grey">Node not found in nodelist.</span>${pad(27)}\u2551
+\u2551  <span class="c-grey">The address you are trying to reach</span>${pad(35)}\u2551
+\u2551  <span class="c-grey">does not exist on this BBS.</span>${pad(27)}\u2551
+\u2551${sp(W - 2)}\u2551
+\u2551  <span class="c-cyan">Check the nodelist and try again.</span>${pad(33)}\u2551
+\u2551${sp(W - 2)}\u2551
+\u255A${hr}\u255D</span>`;
+---
+<TerminalLayout title="404 - Node not found" description="The requested BBS node does not exist.">
+  <div style="margin-top: 4rem; text-align: center;">
+    <pre class="ansi-text" style="display:inline-block; text-align:left;" set:html={box} />
+    <p style="margin-top: 2rem;">
+      <a href="/bbs/" style="border:1px solid var(--red-dark); padding:0.4rem 1rem; display:inline-block; text-decoration:none;">[B] Back to Main Menu</a>
+    </p>
+    <p style="color: var(--grey); font-size: 0.85em; margin-top: 1rem;">
+      Press <span class="c-main-red">B</span> to return to the main menu.
+    </p>
+  </div>
+  <LetterFooter />
+  <StatusBar />
+</TerminalLayout>