diff --git a/www/html/Game/public/js/play.js b/www/html/Game/public/js/play.js
index d96e86d..16e8ccc 100644
--- a/www/html/Game/public/js/play.js
+++ b/www/html/Game/public/js/play.js
@@ -382,17 +382,20 @@
     }
   }
 
-  function drawStackTowerScrollBgFullCanvas(cw, ch) {
+  /** zDrawPan = zoom ตอนวาด stack — ผูกเลื่อนแถบ BG กับกล้องโลก (px จอ = boostWorld * z) */
+  function drawStackTowerScrollBgFullCanvas(cw, ch, zDrawPan) {
     const intro = stackTowerScrollBgIntroImg;
     const loop = stackTowerScrollBgLoopImg;
     if (!intro || !intro.complete || !loop || !loop.complete) return;
+    const zPan = Number(zDrawPan) > 0 ? zDrawPan : zoom;
     const cwR = Math.max(1, Math.round(cw));
     const chR = Math.max(1, Math.round(ch));
     const scaleI = cwR / intro.naturalWidth;
     const drawHIntro = Math.round(intro.naturalHeight * scaleI);
     const scaleL = cwR / loop.naturalWidth;
     const drawHLoop = Math.max(1, Math.round(loop.naturalHeight * scaleL));
-    const S = stackTowerScrollBgPx;
+    const camFollowScreen = isStackTowerMissionUiMapPlay() ? getStackTowerBgScrollHeightBoostPx() * zPan : 0;
+    const S = stackTowerScrollBgPx + camFollowScreen;
     const vp0 = S;
     const vp1 = S + chR;
     const yLimit = vp1 + drawHLoop * 2;
@@ -453,7 +456,7 @@
     const scaleL = cwR / loop.naturalWidth;
     const drawHLoop = Math.max(1, Math.round(loop.naturalHeight * scaleL));
     const skyScreenH = Math.min(chR, Math.ceil(-worldMinY * zDraw) + 4);
-    const scroll = (stackTowerScrollBgPx + getStackTowerBgScrollHeightBoostPx()) % drawHLoop;
+    const scroll = (stackTowerScrollBgPx + getStackTowerBgScrollHeightBoostPx() * zDraw) % drawHLoop;
     let y = -scroll;
     ctx.save();
     ctx.imageSmoothingEnabled = false;
@@ -12965,7 +12968,7 @@
     } else if (stackTowerScrollBgDrawActive()) {
       ctx.fillStyle = '#0a0e22';
       ctx.fillRect(0, 0, canvas.width, canvas.height);
-      drawStackTowerScrollBgFullCanvas(canvas.width, canvas.height);
+      drawStackTowerScrollBgFullCanvas(canvas.width, canvas.height, zDraw);
     } else if (mapBackgroundImg && mapBackgroundImg.complete && mapBackgroundImg.naturalWidth) {
       /* กล้องเห็นพื้นที่นอก [0,map] ได้ — ห้ามสุ่มต้นทาง drawImage เกินขอบภาพ (จะเกิดซ้ำ/เส้นตัด/ซ้อนกันที่ขอบจอ) */
       ctx.fillStyle = (isSpaceShooter() || isBalloonBoss()) ? '#0a0e22' : '#1a1b26';
diff --git a/www/html/Game/public/play.html b/www/html/Game/public/play.html
index b72e4f8..a726052 100644
--- a/www/html/Game/public/play.html
+++ b/www/html/Game/public/play.html
@@ -2009,7 +2009,7 @@
   </div>
   <script src="/Game/socket.io/socket.io.js"></script>
   <script src="js/version.js?v=0.0184"></script>
-  <script src="js/play.js?v=0.272"></script>
+  <script src="js/play.js?v=0.273"></script>
   <div class="version-tag">v —</div>
 </body>
 </html>