diff --git a/www/html/Game/public/js/room-lobby.js b/www/html/Game/public/js/room-lobby.js
index 9ad484d..9705ce3 100644
--- a/www/html/Game/public/js/room-lobby.js
+++ b/www/html/Game/public/js/room-lobby.js
@@ -3121,6 +3121,11 @@
       }
       mapData = res.mapData;
       roomJoinReady = true;
+      /* ไอคอนกุญแจ 🔒 โชว์เฉพาะห้อง private (จาก res.isPrivate) — public ไม่โชว์ */
+      try {
+        const lockEl = document.getElementById('room-id-lock');
+        if (lockEl) lockEl.style.display = res.isPrivate ? '' : 'none';
+      } catch (eLk) { /* ignore */ }
       maybeHideRoomLoading();
       markRoomCzInteractiveCell();
       markHostHcInteractiveCell();
diff --git a/www/html/Game/public/room-lobby.html b/www/html/Game/public/room-lobby.html
index 146c919..92e5410 100644
--- a/www/html/Game/public/room-lobby.html
+++ b/www/html/Game/public/room-lobby.html
@@ -1487,7 +1487,7 @@
     <div class="room-lobby-room-id-pill" aria-label="Room ID">
       <span class="room-lobby-room-id-label">Room ID :</span>
       <strong id="room-id-value">—</strong>
-      <span class="room-lobby-room-id-lock" aria-hidden="true">🔒</span>
+      <span class="room-lobby-room-id-lock" id="room-id-lock" aria-hidden="true" style="display:none">🔒</span>
     </div>
     <div class="room-lobby-exit-fixed">
       <button type="button" id="btn-leave-lobby" class="btn-exit-icon" title="ออกจากห้อง" aria-label="ออกจากห้อง กลับไปสร้างห้อง">
@@ -1617,7 +1617,7 @@
   <script src="js/version.js?v=0.0122"></script>
   <script src="js/customize-popup.js?v=40" data-customize-triggers="" data-customize-asset-base="img/03-5-Customize"></script>
   <script src="js/achievements.js?v=0.002" data-asset-base="img/03-6-Profile"></script>
-  <script src="js/room-lobby.js?v=0.0301"></script>
+  <script src="js/room-lobby.js?v=0.0302"></script>
   <div class="version-tag">v —</div>
 </body>
 </html>