diff --git a/G102-sequence/tdv_sdk.js b/G102-sequence/tdv_sdk.js
index 7d1a353..49888ac 100644
--- a/G102-sequence/tdv_sdk.js
+++ b/G102-sequence/tdv_sdk.js
@@ -108,33 +108,99 @@ var tdv_sdk = {
     onLeaderboardLoaded: function (data) { console.log("SDK: Leaderboard Loaded",data); },
 
     // --- KHỞI TẠO & LOAD DỮ LIỆU ---
-    init: function () {
+    init: function (config) {
         var self = this;
-        const urlParams = new URLSearchParams(window.location.search);
-        const bgParam = urlParams.get('bg');
-        if (bgParam) {
-            this.themeSettings.current_bg = bgParam.startsWith('bg') ? bgParam : "bg" + bgParam;
-        }
-        const id = urlParams.get('game_id') || this.gameID;
-        console.log("🔌 SDK: Sentence Game Initialized. Waiting for data...");
-        window.parent.postMessage({
-            type: "GAME_READY",
-            game_id: id,
-            available_bgs: this.themeSettings.bg_list,
-            selected_bg: this.themeSettings.current_bg
-        }, "*");
+        config = config || {};
+        var urlParams = new URLSearchParams(window.location.search);
 
-        if (urlParams.has('offline') || urlParams.has('demo')) {
-            console.log("🔧 SDK: Offline/Demo mode - Loading default data");
-            this.loadDefaultData();
-        } else {
-            setTimeout(function () {
-                if (!self.serverDataLoaded && self.list.length === 0) {
-                    console.warn("⚠️ SDK: No server data after 3s - Loading default data");
-                    self.loadDefaultData();
-                }
-            }, 3000);
+        this.mode = config.mode || urlParams.get('mode') || 'live';
+        this.game_code = config.game_code || urlParams.get('game_code') || 'G110';
+
+        // Auto preview check
+        if (window.self === window.parent && this.mode === 'live') {
+            console.log("⚠️ Standalone detected - Switching to PREVIEW");
+            this.mode = 'preview';
         }
+
+        // Init window globals for C2
+        window.answerResult = -1;
+        window.gameState = 0;
+
+        var bgParam = urlParams.get('bg');
+        if (bgParam) this.themeSettings.current_bg = bgParam.startsWith('bg') ? bgParam : "bg" + bgParam;
+
+        console.log(`🚀 TDV SDK v4.0 Init | Mode: ${this.mode} | Code: ${this.game_code}`);
+
+        // === CHECK EXTERNAL SDK ===
+        if (typeof SenaGameSDK === 'undefined') {
+            console.error("❌ SenaGameSDK not found! Please import 'sena-game-sdk.js' in HTML.");
+            // Fallback to preview mode with default data
+            setTimeout(function () {
+                self._loadDataToGame(self.defaultData);
+            }, 500);
+            return;
+        }
+
+        // === INIT EXTERNAL SDK (theo SDK_USAGE.md) ===
+        this.sdk = new SenaGameSDK({
+            iframePath: './sdk/package/dist/sdk-iframe/index.html',
+            mode: this.mode,
+            gameCode: this.game_code,
+            debug: true,
+
+            // CALLBACK 1: SDK Ready → Push game items
+            onReady: function (sdk) {
+                console.log("✅ SDK Ready! Pushing game data...", self.defaultData.items.length, "questions");
+
+                // Push items vào SDK (SDK sẽ xử lý và trả về qua onDataReady)
+                sdk.pushData({
+                    items: self.defaultData.items
+                });
+            },
+
+            // CALLBACK 2: Data đã xử lý → Load vào game
+            onDataReady: function (data) {
+                var len = (data && data.items) ? data.items.length : 0;
+                console.log("📥 SDK CALLBACK onDataReady received:", len, "items");
+                if (len > 0) {
+                    self._loadDataToGame(data);
+                } else {
+                    console.warn("⚠️ SDK CALLBACK onDataReady had 0 items, ignoring...");
+                }
+            },
+
+            // CALLBACK 3: Kết quả từng câu
+            onAnswerResult: function (result) {
+                console.log("📝 Answer Result:", result);
+                self._handleAnswerResult(result);
+            },
+
+            // CALLBACK 4: Game hoàn thành
+            onGameComplete: function (result) {
+                console.log("🏆 Game Complete!", result);
+                self._handleGameComplete(result);
+            },
+
+            // CALLBACK 5: Session bắt đầu (optional)
+            onSessionStart: function (session) {
+                console.log("🎮 Session Started:", session);
+                self.gameID = session.gameId;
+                self.userId = session.userId;
+            },
+
+            // CALLBACK 6: Lỗi
+            onError: function (error) {
+                console.error("❌ SDK Error:", error);
+            }
+        });
+
+        // Timeout fallback
+        setTimeout(function () {
+            if (!self.serverDataLoaded) {
+                console.warn("⚠️ SDK Data timeout - Using default local data as fallback");
+                self._loadDataToGame(self.defaultData);
+            }
+        }, 5000); // Giảm xuống 5s cho nhanh
     },
 
     loadDefaultData: function () {
@@ -323,7 +389,7 @@ var tdv_sdk = {
     this.shuffleArray(this.missingWords);
     console.log("🧩 Missing words:", this.missingWords);
     },
-
+    
     // ==================== TÍNH SCALE CHO TỪ ====================
     getWordScale: function () {
         var wordCount = this.currentWords.length;