diff --git a/www/html/Game/public/js/play.js b/www/html/Game/public/js/play.js
index 02da3cb..6629aff 100644
--- a/www/html/Game/public/js/play.js
+++ b/www/html/Game/public/js/play.js
@@ -29,6 +29,8 @@
   const QUIZ_QUESTION_MISSION_MAP_ID = 'mng8a80o';
   /** Stack ซ้อนตึก — ฉากภารกิจ (HOWTO → นับถอยหลัง → เล่น → สรุป) รูปใน `/Game/img/TowerBlock` */
   const STACK_TOWER_MISSION_MAP_ID = 'mnn93hpi';
+  /** Mega Virus — balloon_boss ฉากภารกิจ (flow เดียวกับ crown / mno9kb07) รูปใน `/Game/img/MegaVirus` */
+  const BALLOON_BOSS_MISSION_MAP_ID = 'mnq1eml7';
   /** ครบชั้นนี้ขึ้นไป — ยกจุดแกว่ง/เชือกขึ้น (world px) ป้องกันชนกองสูง (เฉพาะ Tower mission) */
   const STACK_TOWER_SWING_LIFT_FROM_LAYER = 9;
   /** Stack — เกณฑ์ใกล้ความจริง: ทับมากขึ้น, จำกัดการเยื้องจากกลางฐาน, ทับน้อยแล้วโคลงง่ายขึ้น */
@@ -3428,9 +3430,16 @@
   function isGauntletCrownHeistMapPlay() {
     return isGauntletFaceRightMapMno9kb07();
   }
+  function isMegaVirusMissionShellMapPlay() {
+    return !!(mapData && mapData.gameType === 'balloon_boss' && currentPlayMapId() === BALLOON_BOSS_MISSION_MAP_ID);
+  }
+  /** Crown gauntlet หรือ Mega Virus — lobby HOWTO / Ready / นับถอยหลัง / held run */
+  function usesCrownLobbyShellPlay() {
+    return isGauntletCrownHeistMapPlay() || isMegaVirusMissionShellMapPlay();
+  }
   let gauntletCrownHowtoVisible = false;
   function isGauntletCrownPregameBlockingPlay() {
-    if (!isGauntletCrownHeistMapPlay()) return false;
+    if (!usesCrownLobbyShellPlay()) return false;
     if (gauntletCrownRunHeldRemote) return true;
     if (gauntletCrownPregamePhase != null && gauntletCrownPregamePhase !== 'live') return true;
     return false;
@@ -4227,6 +4236,29 @@
     return BASE + '/img/ViolentCrime/' + String(file || '').replace(/^\//, '');
   }
 
+  function megaVirusAssetUrl(file) {
+    return BASE + '/img/MegaVirus/' + String(file || '').replace(/^\//, '');
+  }
+
+  function applyMegaVirusMissionPanelImages() {
+    const howtoBg = document.querySelector('#gauntlet-crown-howto-overlay .gch-bg');
+    if (howtoBg) {
+      howtoBg.src = megaVirusAssetUrl('popup-Howto.png');
+      howtoBg.onerror = function () {
+        this.onerror = null;
+        this.src = BASE + '/img/gauntlet-assets/popup-Howto.png';
+      };
+    }
+    const resBg = document.querySelector('#gauntlet-crown-mission-overlay .gcm-bg');
+    if (resBg) {
+      resBg.src = megaVirusAssetUrl('popup-result.png');
+      resBg.onerror = function () {
+        this.onerror = null;
+        this.src = BASE + '/img/gauntlet-assets/popup-result.png';
+      };
+    }
+  }
+
   function applySpaceShooterMissionPanelImages() {
     const howtoBg = document.querySelector('#gauntlet-crown-howto-overlay .gch-bg');
     if (howtoBg) {
@@ -4475,6 +4507,149 @@
     };
   }
 
+  function balloonBossMergePreviewBotsMission(mission) {
+    if (!mission || mission.uiSkin !== 'mega_virus' || !previewFillBots || !others || typeof others.forEach !== 'function') return mission;
+    const seen = new Set();
+    (mission.ranked || []).forEach(function (r) {
+      if (r && r.id != null) seen.add(String(r.id));
+    });
+    const baseRows = (mission.ranked || []).map(function (r) {
+      return {
+        id: r.id,
+        nickname: r.nickname,
+        characterId: r.characterId,
+        baseScore: Math.max(0, Number(r.baseScore) || 0),
+        eliminated: !!r.eliminated,
+        rankBonus: 0,
+        finalScore: Math.max(0, Number(r.finalScore != null ? r.finalScore : r.baseScore) || 0),
+      };
+    });
+    others.forEach(function (o, id) {
+      if (!o || !isPreviewBotId(id)) return;
+      const sid = String(id);
+      if (seen.has(sid)) return;
+      seen.add(sid);
+      baseRows.push({
+        id: id,
+        nickname: (o.nickname && String(o.nickname).trim()) ? String(o.nickname).trim() : sid,
+        characterId: o.characterId ?? null,
+        baseScore: Math.max(0, Number(o.balloonBossScore) || 0),
+        eliminated: !!o.balloonBossEliminated,
+        rankBonus: 0,
+        finalScore: Math.max(0, Number(o.balloonBossScore) || 0),
+      });
+    });
+    baseRows.sort(function (a, b) {
+      if (b.baseScore !== a.baseScore) return b.baseScore - a.baseScore;
+      return String(a.nickname).localeCompare(String(b.nickname), 'th') || String(a.id).localeCompare(String(b.id));
+    });
+    const top = baseRows.slice(0, 5);
+    const ranked = top.map(function (row, idx) {
+      const pos = idx + 1;
+      const bs = Math.max(0, Number(row.baseScore) || 0);
+      return {
+        id: row.id,
+        nickname: row.nickname,
+        characterId: row.characterId,
+        baseScore: bs,
+        eliminated: !!row.eliminated,
+        rank: pos,
+        rankLabel: pos === 1 ? '1st' : pos === 2 ? '2nd' : pos === 3 ? '3rd' : String(pos),
+        rankBonus: 0,
+        finalScore: bs,
+      };
+    });
+    const totalParts = ranked.map(function (r) { return r.baseScore; });
+    const totalSum = totalParts.reduce(function (s, n) { return s + n; }, 0);
+    const n2 = ranked.length || 1;
+    const averageScore = Math.floor(totalSum / n2);
+    const maxHp = balloonBossMaxHpPlay();
+    const progress = Math.min(1, totalSum / Math.max(1, maxHp));
+    const score100 = Math.min(100, Math.floor(progress * 100));
+    let grade = 'C';
+    if (progress >= 1) grade = 'A';
+    else if (score100 >= 50) grade = 'B';
+    else if (totalSum <= 0) grade = 'F';
+    const rewardCard = grade === 'F' ? null : gauntletCrownRollRewardCardLocal(grade);
+    return {
+      ranked: ranked,
+      totalSum: totalSum,
+      averageScore: averageScore,
+      grade: grade,
+      rewardCard: rewardCard,
+      totalParts: totalParts,
+      uiSkin: 'mega_virus',
+      survivorCount: baseRows.filter(function (r) { return !r.eliminated; }).length,
+      participantCount: baseRows.length,
+      balloonBossEndReason: mission.balloonBossEndReason,
+    };
+  }
+
+  function balloonBossBuildMissionPayloadPlay(reason) {
+    const rows = [];
+    if (myId != null) {
+      rows.push({
+        id: myId,
+        nickname: ((me.nickname || nick || 'คุณ').trim() || 'คุณ'),
+        characterId: me.characterId ?? null,
+        baseScore: Math.max(0, me.balloonBossScore | 0),
+        eliminated: !!me.balloonBossEliminated,
+      });
+    }
+    others.forEach((o, id) => {
+      rows.push({
+        id: id,
+        nickname: (o && o.nickname) ? String(o.nickname).trim() : id,
+        characterId: o && o.characterId != null ? o.characterId : null,
+        baseScore: Math.max(0, o.balloonBossScore | 0),
+        eliminated: !!(o && o.balloonBossEliminated),
+      });
+    });
+    rows.sort((a, b) => b.baseScore - a.baseScore
+      || String(a.nickname).localeCompare(String(b.nickname), 'th')
+      || String(a.id).localeCompare(String(b.id)));
+    const top = rows.slice(0, 5);
+    const ranked = top.map((row, idx) => {
+      const pos = idx + 1;
+      const bs = Math.max(0, Number(row.baseScore) || 0);
+      return {
+        id: row.id,
+        nickname: row.nickname,
+        characterId: row.characterId,
+        baseScore: bs,
+        eliminated: !!row.eliminated,
+        rank: pos,
+        rankLabel: pos === 1 ? '1st' : pos === 2 ? '2nd' : pos === 3 ? '3rd' : String(pos),
+        rankBonus: 0,
+        finalScore: bs,
+      };
+    });
+    const totalParts = ranked.map((r) => r.baseScore);
+    const totalSum = totalParts.reduce((s, n) => s + n, 0);
+    const n2 = ranked.length || 1;
+    const averageScore = Math.floor(totalSum / n2);
+    const maxHp = balloonBossMaxHpPlay();
+    const progress = Math.min(1, totalSum / Math.max(1, maxHp));
+    const score100 = Math.min(100, Math.floor(progress * 100));
+    let grade = 'C';
+    if (reason === 'victory' || progress >= 1) grade = 'A';
+    else if (score100 >= 50) grade = 'B';
+    else if (totalSum <= 0) grade = 'F';
+    const rewardCard = grade === 'F' ? null : gauntletCrownRollRewardCardLocal(grade);
+    return {
+      ranked: ranked,
+      totalSum: totalSum,
+      averageScore: averageScore,
+      grade: grade,
+      rewardCard: rewardCard,
+      totalParts: totalParts,
+      uiSkin: 'mega_virus',
+      survivorCount: rows.filter((r) => !r.eliminated).length,
+      participantCount: rows.length,
+      balloonBossEndReason: reason,
+    };
+  }
+
   function endSpaceShooterMissionRound() {
     if (!isSpaceShooterMissionUiMapPlay() || spaceShooterGameEnded) return;
     spaceShooterGameEnded = true;
@@ -7434,7 +7609,7 @@
     }
     if (Object.prototype.hasOwnProperty.call(payload, 'gauntletCrownRunHeld')) {
       gauntletCrownRunHeldRemote = !!payload.gauntletCrownRunHeld;
-      if (!gauntletCrownRunHeldRemote && isGauntletCrownHeistMapPlay()) {
+      if (!gauntletCrownRunHeldRemote && usesCrownLobbyShellPlay()) {
         gauntletCrownPregamePhase = 'live';
       }
     }
@@ -7920,7 +8095,7 @@
   function updateGauntletCrownHowtoHud() {
     const st = document.getElementById('gauntlet-crown-howto-status');
     const btn = document.getElementById('btn-gch-ready');
-    if (!btn || !isGauntletCrownHeistMapPlay() || gauntletCrownPregamePhase !== 'howto') return;
+    if (!btn || !usesCrownLobbyShellPlay() || gauntletCrownPregamePhase !== 'howto') return;
     const humans = quizCarryPregameHumanIds();
     const tot = Math.max(1, quizCarryPregameTotalPlayers());
     const num = gauntletCrownPregameReadyNumerator();
@@ -7939,7 +8114,7 @@
   }
 
   function beginGauntletCrownCountdownThenRun() {
-    if (!isGauntletCrownHeistMapPlay()) return;
+    if (!usesCrownLobbyShellPlay()) return;
     if (gauntletCrownCountdownTimer) {
       clearTimeout(gauntletCrownCountdownTimer);
       gauntletCrownCountdownTimer = null;
@@ -7950,6 +8125,24 @@
     gauntletCrownHowtoVisible = false;
     const cd = document.getElementById('gauntlet-crown-countdown');
     const numEl = document.getElementById('gauntlet-crown-countdown-num');
+    function applyMegaBalloonLiveStartPlay() {
+      balloonBossSessionStartMs = performance.now();
+      balloonBossLastTickMs = performance.now();
+      balloonBossGameEnded = false;
+      balloonBossPendingShots = [];
+      balloonBossPlayerBullets = [];
+      balloonBossBossBullets = [];
+      balloonBossBossFireAcc = 0;
+      me.balloonBossScore = 0;
+      me.balloonBossBalloons = balloonBossBalloonsStartPlay();
+      me.balloonBossEliminated = false;
+      others.forEach((o) => {
+        o.balloonBossScore = 0;
+        o.balloonBossBalloons = balloonBossBalloonsStartPlay();
+        o.balloonBossEliminated = false;
+      });
+      if (mapData) applyBalloonBossSpawnLayoutPlay();
+    }
     const runFinish = () => {
       if (cd) cd.classList.add('is-hidden');
       if (gauntletCrownCountdownTimer) {
@@ -7958,10 +8151,14 @@
       }
       if (socket && socket.connected) {
         socket.emit('gauntlet-crown-begin-run', (res) => {
-          if (res && res.ok) gauntletCrownPregamePhase = 'live';
+          if (res && res.ok) {
+            gauntletCrownPregamePhase = 'live';
+            if (isMegaVirusMissionShellMapPlay()) applyMegaBalloonLiveStartPlay();
+          }
         });
       } else {
         gauntletCrownPregamePhase = 'live';
+        if (isMegaVirusMissionShellMapPlay()) applyMegaBalloonLiveStartPlay();
       }
     };
     if (!cd || !numEl) {
@@ -7985,8 +8182,9 @@
   }
 
   function showGauntletCrownHowtoOverlay() {
-    if (!isGauntletCrownHeistMapPlay()) return;
+    if (!usesCrownLobbyShellPlay()) return;
     hideConflictingOverlaysForGauntletCrown();
+    if (isMegaVirusMissionShellMapPlay()) applyMegaVirusMissionPanelImages();
     const cd = document.getElementById('gauntlet-crown-countdown');
     if (cd) cd.classList.add('is-hidden');
     if (gauntletCrownCountdownTimer) {
@@ -8020,6 +8218,10 @@
       const g = String(mission.grade || '').trim().toUpperCase().charAt(0);
       return g !== 'F';
     }
+    if (mission.uiSkin === 'mega_virus') {
+      const g = String(mission.grade || '').trim().toUpperCase().charAt(0);
+      return g !== 'F';
+    }
     const g = String(mission.grade || '').trim().toUpperCase().charAt(0);
     return g !== 'F';
   }
@@ -8053,7 +8255,7 @@
    */
   function gauntletCrownBuildDisplayMission(mission) {
     if (!mission || !Array.isArray(mission.ranked)) return mission;
-    if (mission.uiSkin === 'jumper' || mission.uiSkin === 'violent_crime' || mission.uiSkin === 'question_mission' || mission.uiSkin === 'stack_tower') return mission;
+    if (mission.uiSkin === 'jumper' || mission.uiSkin === 'violent_crime' || mission.uiSkin === 'question_mission' || mission.uiSkin === 'stack_tower' || mission.uiSkin === 'mega_virus') return mission;
     if (!(previewFillBots && isGauntletCrownHeistMapPlay() && others && typeof others.forEach === 'function')) return mission;
 
     const seen = new Set();
@@ -8142,6 +8344,8 @@
       disp = quizQuestionMissionMergePreviewBotsMission(disp) || disp;
     } else if (mission.uiSkin === 'stack_tower') {
       disp = stackTowerMissionMergePreviewBotsMission(disp) || disp;
+    } else if (mission.uiSkin === 'mega_virus') {
+      disp = balloonBossMergePreviewBotsMission(disp) || disp;
     }
     if (!disp || !Array.isArray(disp.ranked)) return;
     rowEl.innerHTML = '';
@@ -8206,10 +8410,11 @@
       nick.textContent = r.nickname || '—';
       const sc = document.createElement('div');
       sc.className = 'gcm-sc';
-      const jumpPlain = mission && (mission.uiSkin === 'jumper' || mission.uiSkin === 'violent_crime' || mission.uiSkin === 'question_mission' || mission.uiSkin === 'stack_tower');
+      const jumpPlain = mission && (mission.uiSkin === 'jumper' || mission.uiSkin === 'violent_crime' || mission.uiSkin === 'question_mission' || mission.uiSkin === 'stack_tower' || mission.uiSkin === 'mega_virus');
       const botScorePlain = (previewFillBots && isGauntletCrownHeistMapPlay() && isPreviewBotId(r.id))
         || (previewFillBots && mission && mission.uiSkin === 'question_mission' && isPreviewBotId(r.id))
-        || (previewFillBots && mission && mission.uiSkin === 'stack_tower' && isPreviewBotId(r.id));
+        || (previewFillBots && mission && mission.uiSkin === 'stack_tower' && isPreviewBotId(r.id))
+        || (previewFillBots && mission && mission.uiSkin === 'mega_virus' && isPreviewBotId(r.id));
       sc.textContent = (jumpPlain || botScorePlain)
         ? String(Math.max(0, Number(r.baseScore) || 0))
         : String(r.baseScore || 0) + '(+' + String(r.rankBonus || 0) + ')';
@@ -8240,6 +8445,9 @@
       } else if (mission && mission.uiSkin === 'stack_tower') {
         const pc = Math.max(0, Math.floor(Number(disp.participantCount) || 0));
         totalEl.innerHTML = 'คะแนนรวม <span class="gcm-total-nums">(' + parts.join('+') + ') = ' + sum + '</span> · ผู้เล่น ' + pc + ' → เกรด';
+      } else if (mission && mission.uiSkin === 'mega_virus') {
+        const pc = Math.max(0, Math.floor(Number(disp.participantCount) || 0));
+        totalEl.innerHTML = 'ความเสียหายรวม <span class="gcm-total-nums">(' + parts.join('+') + ') = ' + sum + '</span> · ผู้เล่น ' + pc + ' → เกรด';
       } else {
         totalEl.innerHTML = 'คะแนนรวม <span class="gcm-total-nums">(' + parts.join('+') + ') = ' + sum + '</span> · เฉลี่ย ' + avg + ' → เกรด';
       }
@@ -8260,9 +8468,10 @@
         row.style.gap = '8px';
         const chk = document.createElement('img');
         const stackTS = mission && mission.uiSkin === 'stack_tower';
-        chk.src = stackTS ? stackTowerAssetUrl('result-check.png') : (BASE + '/img/gauntlet-assets/result-check.png');
+        const megaVs = mission && mission.uiSkin === 'mega_virus';
+        chk.src = stackTS ? stackTowerAssetUrl('result-check.png') : (megaVs ? megaVirusAssetUrl('result-check.png') : (BASE + '/img/gauntlet-assets/result-check.png'));
         chk.alt = '';
-        if (stackTS) {
+        if (stackTS || megaVs) {
           chk.onerror = function () {
             this.onerror = null;
             this.src = BASE + '/img/gauntlet-assets/result-check.png';
@@ -8295,7 +8504,7 @@
     }
     const gcmHead = document.getElementById('gcm-heading');
     if (gcmHead) {
-      if (mission && (mission.uiSkin === 'question_mission' || mission.uiSkin === 'stack_tower')) gcmHead.classList.add('sr-only');
+      if (mission && (mission.uiSkin === 'question_mission' || mission.uiSkin === 'stack_tower' || mission.uiSkin === 'mega_virus')) gcmHead.classList.add('sr-only');
       else gcmHead.classList.remove('sr-only');
     }
     ov.classList.remove('is-hidden');
@@ -8309,7 +8518,7 @@
         if (previewMode && editorEmbedReturn) {
           ov.classList.add('is-hidden');
           if (gcmHead) gcmHead.classList.remove('sr-only');
-          if (mission && (mission.uiSkin === 'question_mission' || mission.uiSkin === 'stack_tower')) {
+          if (mission && (mission.uiSkin === 'question_mission' || mission.uiSkin === 'stack_tower' || mission.uiSkin === 'mega_virus')) {
             cancelQuizCarryResultEndAfterTimeup();
             hideQuizCarryTimeupOnDeskLayer();
             hideQuizCarryResultEndLayer();
@@ -9447,6 +9656,8 @@
   function balloonBossRemainingSecPlay() {
     const lim = balloonBossTimeLimitSecPlay();
     if (lim <= 0) return null;
+    if (isMegaVirusMissionShellMapPlay() && isGauntletCrownPregameBlockingPlay()) return lim;
+    if (!balloonBossSessionStartMs) return lim;
     const elapsed = (performance.now() - balloonBossSessionStartMs) / 1000;
     return Math.max(0, Math.ceil(lim - elapsed));
   }
@@ -9521,6 +9732,11 @@
     balloonBossPendingShots = [];
     balloonBossPlayerBullets = [];
     balloonBossBossBullets = [];
+    if (isMegaVirusMissionShellMapPlay()) {
+      applyMegaVirusMissionPanelImages();
+      showGauntletCrownMissionOverlay(balloonBossBuildMissionPayloadPlay(reason));
+      return;
+    }
     const ov = document.getElementById('gauntlet-ended-overlay');
     const msgEl = document.getElementById('gauntlet-ended-message');
     const titleEl = document.getElementById('gauntlet-ended-title');
@@ -9597,6 +9813,7 @@
 
   function balloonBossTickFrame() {
     if (!mapData || mapData.gameType !== 'balloon_boss') return;
+    if (isMegaVirusMissionShellMapPlay() && isGauntletCrownPregameBlockingPlay()) return;
     const w = mapData.width || 20, h = mapData.height || 15;
     const ts = tileSize;
     const mw = w * ts, mh = h * ts;
@@ -10884,8 +11101,13 @@
     if (mapData.gameType !== 'quiz_carry') {
       quizCarryWalkSpeedMultActive = QUIZ_CARRY_WALK_SPEED_MULT;
     }
-    if (res && res.mapId != null && String(res.mapId).trim() !== '') {
-      playSessionMapId = String(res.mapId).trim();
+    {
+      const qMap = (playMapIdFromQuery || '').trim();
+      const dataId = mapData && mapData.id != null && String(mapData.id).trim() !== '' ? String(mapData.id).trim() : '';
+      const resMap = res && res.mapId != null && String(res.mapId).trim() !== '' ? String(res.mapId).trim() : '';
+      if (qMap) playSessionMapId = qMap;
+      else if (dataId) playSessionMapId = dataId;
+      else if (resMap) playSessionMapId = resMap;
     }
     if (res && res.hostId != null) playHostId = res.hostId;
     if (!isQuizQuestionMissionUiMapPlay()) {
@@ -11208,6 +11430,20 @@
       const gccR = document.getElementById('gauntlet-crown-countdown');
       if (gccR) gccR.classList.add('is-hidden');
       setTimeout(function () { showGauntletCrownHowtoOverlay(); }, 50);
+    } else if (mapData.gameType === 'balloon_boss' && isMegaVirusMissionShellMapPlay()) {
+      hideConflictingOverlaysForGauntletCrown();
+      gauntletCrownPregamePhase = null;
+      gauntletCrownLobbyReadyMap = {};
+      if (gauntletCrownCountdownTimer) {
+        clearTimeout(gauntletCrownCountdownTimer);
+        gauntletCrownCountdownTimer = null;
+      }
+      const gccRm = document.getElementById('gauntlet-crown-countdown');
+      if (gccRm) gccRm.classList.add('is-hidden');
+      if (res && Object.prototype.hasOwnProperty.call(res, 'gauntletCrownRunHeld')) {
+        applyGauntletTimingFromServer({ gauntletCrownRunHeld: res.gauntletCrownRunHeld });
+      }
+      setTimeout(function () { showGauntletCrownHowtoOverlay(); }, 50);
     } else if (mapData.gameType === 'jump_survive' && isJumpSurviveMissionUiMapPlay()) {
       if (gauntletCrownCountdownTimer) {
         clearTimeout(gauntletCrownCountdownTimer);
@@ -11385,7 +11621,7 @@
     }
   });
   socket.on('gauntlet-crown-lobby-started', () => {
-    if (!isGauntletCrownHeistMapPlay()) return;
+    if (!usesCrownLobbyShellPlay()) return;
     beginGauntletCrownCountdownThenRun();
   });
   socket.on('user-move', (data) => {
@@ -11573,7 +11809,12 @@
   });
 
   socket.on('gauntlet-sync', (data) => {
-    if (!mapData || mapData.gameType !== 'gauntlet' || !data) return;
+    if (!data || typeof data !== 'object') return;
+    if (isMegaVirusMissionShellMapPlay()) {
+      applyGauntletTimingFromServer(data);
+      return;
+    }
+    if (!mapData || mapData.gameType !== 'gauntlet') return;
     applyGauntletTimingFromServer(data);
     if (Array.isArray(data.obstacles)) {
       gauntletObstacles = data.obstacles;
@@ -11795,10 +12036,12 @@
         }
       } else {
         gauntletEndsAtMs = null;
+        const megaShellGs = mapData.gameType === 'balloon_boss' && String(ev.mapId || '').trim() === BALLOON_BOSS_MISSION_MAP_ID;
         const skipHideCrownShell = (mapData.gameType === 'jump_survive' && isJumpSurviveMissionUiMapPlay())
           || (mapData.gameType === 'space_shooter' && isSpaceShooterMissionUiMapPlay())
           || (mapData.gameType === 'quiz' && isQuizQuestionMissionUiMapPlay())
-          || (mapData.gameType === 'stack' && isStackTowerMissionUiMapPlay());
+          || (mapData.gameType === 'stack' && isStackTowerMissionUiMapPlay())
+          || megaShellGs;
         if (!skipHideCrownShell) {
           const hto3 = document.getElementById('gauntlet-crown-howto-overlay');
           if (hto3) hto3.classList.add('is-hidden');
@@ -11927,7 +12170,6 @@
         balloonBossHitFx = [];
         balloonBossLastTickMs = performance.now();
         balloonBossPlayerFireCd = 0;
-        balloonBossSessionStartMs = performance.now();
         balloonBossLastMoveEmit = 0;
         balloonBossBossFireAcc = 0;
         me.balloonBossScore = 0;
@@ -11938,10 +12180,36 @@
           o.balloonBossBalloons = balloonBossBalloonsStartPlay();
           o.balloonBossEliminated = false;
         });
-        fetch(BASE + '/api/game-timing?_=' + Date.now(), { cache: 'no-store' })
-          .then((r) => (r.ok ? r.json() : null))
-          .then((t) => { if (t) applyGauntletTimingFromServer(t); })
-          .catch(() => {});
+        if (String(ev.mapId || '').trim() === BALLOON_BOSS_MISSION_MAP_ID) {
+          balloonBossSessionStartMs = 0;
+          if (Object.prototype.hasOwnProperty.call(ev, 'gauntletCrownRunHeld')) {
+            applyGauntletTimingFromServer({ gauntletCrownRunHeld: ev.gauntletCrownRunHeld });
+          }
+          fetch(BASE + '/api/game-timing?_=' + Date.now(), { cache: 'no-store' })
+            .then((r) => (r.ok ? r.json() : null))
+            .then((t) => {
+              if (t) applyGauntletTimingFromServer(t);
+              if (Object.prototype.hasOwnProperty.call(ev, 'gauntletCrownRunHeld')) {
+                applyGauntletTimingFromServer({ gauntletCrownRunHeld: ev.gauntletCrownRunHeld });
+              }
+            })
+            .catch(() => {});
+          gauntletCrownPregamePhase = null;
+          gauntletCrownLobbyReadyMap = {};
+          if (gauntletCrownCountdownTimer) {
+            clearTimeout(gauntletCrownCountdownTimer);
+            gauntletCrownCountdownTimer = null;
+          }
+          const gccMv = document.getElementById('gauntlet-crown-countdown');
+          if (gccMv) gccMv.classList.add('is-hidden');
+          setTimeout(function () { showGauntletCrownHowtoOverlay(); }, 60);
+        } else {
+          balloonBossSessionStartMs = performance.now();
+          fetch(BASE + '/api/game-timing?_=' + Date.now(), { cache: 'no-store' })
+            .then((r) => (r.ok ? r.json() : null))
+            .then((t) => { if (t) applyGauntletTimingFromServer(t); })
+            .catch(() => {});
+        }
       }
       if (mapData.gameType === 'quiz_battle') {
         if (!mapData.quizBattleDomeArea) mapData.quizBattleDomeArea = [];
@@ -13124,7 +13392,9 @@
           timeVal.textContent = rem != null ? String(rem) : '∞';
         }
       } else if (isBalloonBoss()) {
-        if (balloonBossGameEnded) {
+        if (isMegaVirusMissionShellMapPlay() && isGauntletCrownPregameBlockingPlay()) {
+          timeVal.textContent = '···';
+        } else if (balloonBossGameEnded) {
           timeVal.textContent = '0';
         } else {
           const rem = balloonBossRemainingSecPlay();
@@ -14124,6 +14394,12 @@
       }
       return;
     }
+    if (isBalloonBoss() && isMegaVirusMissionShellMapPlay() && isGauntletCrownPregameBlockingPlay() && mapData && !isChatFocused()) {
+      if (['Space', 'ArrowUp', 'ArrowDown', 'ArrowLeft', 'ArrowRight', 'KeyW', 'KeyA', 'KeyS', 'KeyD'].includes(e.code)) {
+        e.preventDefault();
+      }
+      return;
+    }
     if ((isSpaceShooter() || isBalloonBoss()) && mapData && !isChatFocused()) {
       if (['Space', 'ArrowUp', 'ArrowDown', 'ArrowLeft', 'ArrowRight', 'KeyW', 'KeyA', 'KeyS', 'KeyD'].includes(e.code)) {
         e.preventDefault();
@@ -14500,7 +14776,7 @@
         beginStackTowerMissionCountdownThenRun();
         return;
       }
-      if (!isGauntletCrownHeistMapPlay()) return;
+      if (!usesCrownLobbyShellPlay()) return;
       if (gauntletCrownPregamePhase !== 'howto') return;
       if (myId == null || !isMePlayHost()) return;
       const humans = quizCarryPregameHumanIds();
diff --git a/www/html/Game/server.js b/www/html/Game/server.js
index ff851df..4d3d73d 100644
--- a/www/html/Game/server.js
+++ b/www/html/Game/server.js
@@ -2895,11 +2895,43 @@ const GAUNTLET_LASER_SPAWN_CHANCE = 0.14;
 const GAUNTLET_LANE_ROW_SPAWN_CHANCE = 0.34;
 /** Last Light / museum gauntlet — scoring, mission UI, how-to flow */
 const GAUNTLET_CROWN_HEIST_MAP_ID = 'mno9kb07';
+/** Mega Virus — balloon_boss ฉากภารกิจ (flow เดียวกับ crown) */
+const BALLOON_BOSS_MISSION_MAP_ID = 'mnq1eml7';
 
 function isGauntletCrownHeistMapBySpace(space) {
   return !!(space && space.mapId && String(space.mapId) === GAUNTLET_CROWN_HEIST_MAP_ID);
 }
 
+function isBalloonBossMissionShellSpace(space) {
+  if (!space || !space.mapId || String(space.mapId) !== BALLOON_BOSS_MISSION_MAP_ID) return false;
+  const md = (space.mapId && maps.get(space.mapId)) || space.mapData;
+  return !!(md && md.gameType === 'balloon_boss');
+}
+
+function isCrownLobbyShellSpace(space) {
+  return isGauntletCrownHeistMapBySpace(space) || isBalloonBossMissionShellSpace(space);
+}
+
+function newBalloonBossShellGauntletRunState() {
+  return {
+    obstacles: [],
+    nextObsId: 1,
+    spawnAcc: 0,
+    nextSpawnIn: 999,
+    crownRunHeld: true,
+    timerId: null,
+    endsAt: null,
+  };
+}
+
+function emitBalloonBossMissionShellGauntletSync(sid, space) {
+  if (!isBalloonBossMissionShellSpace(space)) return;
+  const gr = space.gauntletRun;
+  io.to(sid).emit('gauntlet-sync', {
+    gauntletCrownRunHeld: !!(gr && gr.crownRunHeld),
+  });
+}
+
 function rollGauntletCrownRewardCard(grade) {
   const r = Math.random();
   if (grade === 'A') {
@@ -3671,6 +3703,11 @@ io.on('connection', (socket) => {
         io.to(spaceId).emit('gauntlet-crown-lobby-sync', { readyMap: { ...space.gauntletCrownLobbyReady } });
       }
       startGauntletTicker(spaceId, space);
+    } else if (isBalloonBossMissionShellSpace(space)) {
+      if (!space.gauntletCrownLobbyReady || typeof space.gauntletCrownLobbyReady !== 'object') space.gauntletCrownLobbyReady = {};
+      space.gauntletCrownLobbyReady[socket.id] = false;
+      if (!space.gauntletRun) space.gauntletRun = newBalloonBossShellGauntletRunState();
+      io.to(spaceId).emit('gauntlet-crown-lobby-sync', { readyMap: { ...space.gauntletCrownLobbyReady } });
     }
     const peersList = [...space.peers.values()];
     const mapData = mdJoin;
@@ -3715,6 +3752,9 @@ io.on('connection', (socket) => {
     if (mdJoin.gameType === 'gauntlet' && space.gauntletRun) {
       joinCb.gauntletEndsAt = space.gauntletRun.endsAt != null ? space.gauntletRun.endsAt : null;
     }
+    if (isBalloonBossMissionShellSpace(space) && space.gauntletRun) {
+      joinCb.gauntletCrownRunHeld = !!space.gauntletRun.crownRunHeld;
+    }
     if (typeof cb === 'function') cb(joinCb);
     socket.to(spaceId).emit('user-joined', peer);
     if (space.voiceInits) {
@@ -3977,6 +4017,13 @@ io.on('connection', (socket) => {
               gauntletEliminated: !!p.gauntletEliminated,
             }));
           }
+          if (md && isBalloonBossMissionShellSpace(space)) {
+            if (!space.gauntletCrownLobbyReady || typeof space.gauntletCrownLobbyReady !== 'object') space.gauntletCrownLobbyReady = {};
+            space.peers.forEach((_p, id) => {
+              space.gauntletCrownLobbyReady[id] = false;
+            });
+            space.gauntletRun = newBalloonBossShellGauntletRunState();
+          }
         }
         const gameStartPayload = {
           mapId: mapId || undefined,
@@ -3985,6 +4032,10 @@ io.on('connection', (socket) => {
           peersSnap: peersSnap || undefined,
         };
         if (peersSnap) gameStartPayload.gauntletEndsAt = gauntletEndsAtEmit != null ? gauntletEndsAtEmit : null;
+        if (mapId && maps.has(mapId) && isBalloonBossMissionShellSpace(space)) {
+          const grs = space.gauntletRun;
+          gameStartPayload.gauntletCrownRunHeld = !!(grs && grs.crownRunHeld);
+        }
         io.to(sid).emit('game-start', gameStartPayload);
         return reply({ ok: true });
       }
@@ -4014,7 +4065,7 @@ io.on('connection', (socket) => {
     }
     if (space.gauntletCrownLobbyReady && typeof space.gauntletCrownLobbyReady === 'object') {
       delete space.gauntletCrownLobbyReady[socket.id];
-      if (isGauntletCrownHeistMapBySpace(space)) {
+      if (isCrownLobbyShellSpace(space)) {
         io.to(sid).emit('gauntlet-crown-lobby-sync', { readyMap: { ...space.gauntletCrownLobbyReady } });
       }
     }
@@ -4057,14 +4108,20 @@ io.on('connection', (socket) => {
     const gr = space.gauntletRun;
     if (!gr) return reply({ ok: false });
     const md = (space.mapId && maps.get(space.mapId)) || space.mapData;
-    if (!md || md.gameType !== 'gauntlet' || !isGauntletCrownHeistMapBySpace(space)) return reply({ ok: false });
+    const okGauntletCrown = md && md.gameType === 'gauntlet' && isGauntletCrownHeistMapBySpace(space);
+    const okBalloonShell = md && md.gameType === 'balloon_boss' && isBalloonBossMissionShellSpace(space);
+    if (!okGauntletCrown && !okBalloonShell) return reply({ ok: false });
     const previewRoom = !!(space.previewEditorTest
       || (space.isPrivate && String(space.spaceName || '').toLowerCase() === 'preview'));
     if (!previewRoom && space.hostId !== socket.id) return reply({ ok: false, error: 'host' });
     if (!gr.crownRunHeld) return reply({ ok: true, already: true });
     gr.crownRunHeld = false;
-    ensureGauntletEndsAtIfNeeded(space);
-    emitGauntletSync(sid, space);
+    if (okGauntletCrown) {
+      ensureGauntletEndsAtIfNeeded(space);
+      emitGauntletSync(sid, space);
+    } else {
+      emitBalloonBossMissionShellGauntletSync(sid, space);
+    }
     return reply({ ok: true });
   });
 
@@ -4134,7 +4191,7 @@ io.on('connection', (socket) => {
     const sid = socket.data.spaceId;
     const space = sid ? spaces.get(sid) : null;
     if (!space || !space.peers.has(socket.id)) return;
-    if (!isGauntletCrownHeistMapBySpace(space)) return;
+    if (!isCrownLobbyShellSpace(space)) return;
     if (!space.gauntletCrownLobbyReady || typeof space.gauntletCrownLobbyReady !== 'object') {
       space.gauntletCrownLobbyReady = {};
     }
@@ -4148,7 +4205,7 @@ io.on('connection', (socket) => {
     const sid = socket.data.spaceId;
     const space = sid ? spaces.get(sid) : null;
     if (!space || !space.peers.has(socket.id)) return;
-    if (!isGauntletCrownHeistMapBySpace(space)) return;
+    if (!isCrownLobbyShellSpace(space)) return;
     if (!space.gauntletCrownLobbyReady || typeof space.gauntletCrownLobbyReady !== 'object') space.gauntletCrownLobbyReady = {};
     for (const id of space.peers.keys()) {
       if (space.gauntletCrownLobbyReady[id] === undefined) space.gauntletCrownLobbyReady[id] = false;
@@ -4162,7 +4219,7 @@ io.on('connection', (socket) => {
     const sid = socket.data.spaceId;
     const space = sid ? spaces.get(sid) : null;
     if (!space || !space.peers.has(socket.id)) return reply({ ok: false, error: 'ไม่อยู่ในห้อง' });
-    if (!isGauntletCrownHeistMapBySpace(space)) return reply({ ok: false, error: 'ไม่ใช่แมป crown' });
+    if (!isCrownLobbyShellSpace(space)) return reply({ ok: false, error: 'ไม่ใช่แมป crown / Mega Virus ภารกิจ' });
     if (space.hostId !== socket.id) return reply({ ok: false, error: 'เฉพาะโฮสต์กด START' });
     const gr = space.gauntletRun;
     if (!gr || !gr.crownRunHeld) return reply({ ok: false, error: 'เริ่มแล้ว' });