diff --git a/Assets/Editor/VRBeatSaberSceneBuilder.cs b/Assets/Editor/VRBeatSaberSceneBuilder.cs
index 733131e..dad6472 100644
--- a/Assets/Editor/VRBeatSaberSceneBuilder.cs
+++ b/Assets/Editor/VRBeatSaberSceneBuilder.cs
@@ -16,6 +16,188 @@ public static class VRBeatSaberSceneBuilder
 {
     private static GameObject s_cardPrefab;
 
+    // ══════════════════════════════════════════════════════════
+    // 뒤로가기 버튼 패치 (기존 씬에 추가)
+    // ══════════════════════════════════════════════════════════
+
+    [MenuItem("Tools/VRBeatSaber/뒤로가기 버튼 추가 (기존 씬 패치)")]
+    public static void PatchBackButtons()
+    {
+        if (!EditorSceneManager.SaveCurrentModifiedScenesIfUserWantsTo()) return;
+
+        // SongSelect: 뒤로(Intro) + DetailPanel 닫기(X)
+        PatchSceneWithBackButton(
+            "Assets/Scenes/SongSelect.unity",
+            () =>
+            {
+                FindAndBindBackButton<SongSelectManager>("backButton", "< 뒤로", new Vector2(-500, 310), new Vector2(130, 50));
+                AddDetailPanelCloseButton();
+            });
+
+        // SongCreator: 뒤로(Intro)
+        PatchSceneWithBackButton(
+            "Assets/Scenes/SongCreator.unity",
+            () => FindAndBindBackButton<SongCreatorManager>("backButton", "< 뒤로", new Vector2(-405, 345), new Vector2(130, 50)));
+
+        // MapEditorScene: 뒤로(SongCreator)
+        PatchSceneWithBackButton(
+            "Assets/Scenes/MapEditorScene.unity",
+            FindAndBindBackButtonOnMapEditor);
+
+        // Game: 뒤로(SongSelect) — 우측 상단 소형 버튼
+        PatchSceneWithBackButton(
+            "Assets/Scenes/Game.unity",
+            AddGameSceneBackButton);
+
+        AssetDatabase.Refresh();
+        EditorUtility.DisplayDialog("완료", "뒤로가기 버튼 추가 완료!\n\n추가된 버튼:\n- SongSelect: < 뒤로 + 상세패널 X 닫기\n- SongCreator: < 뒤로\n- MapEditorScene: < 뒤로\n- Game: < 뒤로", "확인");
+    }
+
+    private static void PatchSceneWithBackButton(string scenePath, System.Action patchAction)
+    {
+        if (!File.Exists(scenePath)) { Debug.LogWarning($"[SceneBuilder] 씬 없음: {scenePath}"); return; }
+        var scene = EditorSceneManager.OpenScene(scenePath, OpenSceneMode.Single);
+        patchAction();
+        EditorSceneManager.SaveScene(scene);
+        Debug.Log($"[SceneBuilder] 패치 완료: {scenePath}");
+    }
+
+    private static void FindAndBindBackButton<T>(string fieldName, string label, Vector2 pos, Vector2 size) where T : MonoBehaviour
+    {
+        var mgr = Object.FindObjectOfType<T>();
+        if (mgr == null) { Debug.LogWarning($"[SceneBuilder] {typeof(T).Name} 없음"); return; }
+
+        // 이미 있으면 건너뜀
+        var so = new SerializedObject(mgr);
+        if (so.FindProperty(fieldName)?.objectReferenceValue != null) return;
+
+        // Canvas 찾기
+        var canvas = Object.FindObjectOfType<Canvas>();
+        if (canvas == null) return;
+
+        var backGO  = MakeButton("BackButton", canvas.transform, label, pos, size);
+        backGO.GetComponent<UnityEngine.UI.Image>().color = new Color(0.18f, 0.18f, 0.18f);
+
+        Bind(so, fieldName, backGO.GetComponent<Button>());
+        so.ApplyModifiedProperties();
+    }
+
+    // SongDetailPanel 닫기(X) 버튼
+    private static void AddDetailPanelCloseButton()
+    {
+        var detail = Object.FindObjectOfType<SongDetailPanel>();
+        if (detail == null) { Debug.LogWarning("[SceneBuilder] SongDetailPanel 없음"); return; }
+
+        var so = new SerializedObject(detail);
+        if (so.FindProperty("closeButton")?.objectReferenceValue != null) return;
+
+        // DetailPanel의 RectTransform 우측 상단에 X 버튼 배치
+        var detailRT = detail.GetComponent<RectTransform>();
+        if (detailRT == null) return;
+
+        var closeGO = MakeButton("CloseButton", detail.transform, "✕", new Vector2(detailRT.sizeDelta.x / 2f - 30, detailRT.sizeDelta.y / 2f - 30), new Vector2(50, 50));
+        closeGO.GetComponent<Image>().color = new Color(0.6f, 0.15f, 0.15f);
+
+        Bind(so, "closeButton", closeGO.GetComponent<Button>());
+        so.ApplyModifiedProperties();
+    }
+
+    // Game씬 뒤로가기 버튼 (Canvas 없으면 생성)
+    private static void AddGameSceneBackButton()
+    {
+        var spawner = Object.FindObjectOfType<Spawner>();
+        if (spawner == null) { Debug.LogWarning("[SceneBuilder] Spawner 없음"); return; }
+
+        // Game씬에 Canvas가 있는지 확인, 없으면 생성
+        var canvas = Object.FindObjectOfType<Canvas>();
+        if (canvas == null)
+        {
+            var canvasGO = new GameObject("HUDCanvas");
+            var c = canvasGO.AddComponent<Canvas>();
+            c.renderMode = RenderMode.WorldSpace;
+            canvasGO.AddComponent<CanvasScaler>();
+
+            var trackedType = System.Type.GetType(
+                "UnityEngine.XR.Interaction.Toolkit.UI.TrackedDeviceGraphicRaycaster, Unity.XR.Interaction.Toolkit");
+            if (trackedType != null)
+                canvasGO.AddComponent(trackedType);
+            else
+                canvasGO.AddComponent<GraphicRaycaster>();
+
+            var rt = canvasGO.GetComponent<RectTransform>();
+            rt.sizeDelta = new Vector2(400, 80);
+            // 플레이어 앞 위쪽, 항상 보이는 위치
+            canvasGO.transform.position   = new Vector3(0f, 2.2f, 1.5f);
+            canvasGO.transform.localScale  = Vector3.one * 0.002f;
+            canvas = c;
+        }
+
+        // 이미 BackButton이 있으면 건너뜀
+        if (canvas.transform.Find("BackButton") != null) return;
+
+        var backGO = MakeButton("BackButton", canvas.transform, "< 뒤로", new Vector2(-130, 0), new Vector2(150, 60));
+        backGO.GetComponent<Image>().color = new Color(0.2f, 0.2f, 0.2f, 0.85f);
+
+        // Spawner에 backButton 필드가 없으므로 런타임 클릭 이벤트만 추가
+        // (Spawner는 Quest B버튼용 InputActionReference 사용, 버튼은 클릭 처리 필요)
+        // → GameBackButton 컴포넌트로 처리
+        var handler = backGO.AddComponent<GameBackButton>();
+        var sso = new SerializedObject(handler);
+        var targetProp = sso.FindProperty("targetScene");
+        if (targetProp != null) targetProp.stringValue = "SongSelect";
+        sso.ApplyModifiedProperties();
+    }
+
+    private static void FindAndBindBackButtonOnMapEditor()
+    {
+        var mgr = Object.FindObjectOfType<MapEditor>();
+        if (mgr == null) { Debug.LogWarning("[SceneBuilder] MapEditor 없음"); return; }
+
+        var so = new SerializedObject(mgr);
+        if (so.FindProperty("backButton")?.objectReferenceValue != null) return;
+
+        var canvas = Object.FindObjectOfType<Canvas>();
+        if (canvas == null)
+        {
+            // MapEditorScene에 Canvas가 없을 수 있으므로 직접 생성
+            var canvasGO = new GameObject("Canvas");
+            var c = canvasGO.AddComponent<Canvas>();
+            c.renderMode = RenderMode.WorldSpace;
+            canvasGO.AddComponent<CanvasScaler>();
+            canvasGO.AddComponent<GraphicRaycaster>();
+            var rt = canvasGO.GetComponent<RectTransform>();
+            rt.sizeDelta = new Vector2(200, 60);
+            canvasGO.transform.position = new Vector3(-0.8f, 1.8f, 2f);
+            canvasGO.transform.localScale = Vector3.one * 0.002f;
+            canvas = canvasGO.GetComponent<Canvas>();
+        }
+
+        var backGO = MakeButton("BackButton", canvas.transform, "< 뒤로", new Vector2(0, 0), new Vector2(180, 55));
+        Bind(so, "backButton", backGO.GetComponent<Button>());
+        so.ApplyModifiedProperties();
+    }
+
+    [MenuItem("Tools/VRBeatSaber/씬 재빌드 (SongCreator + SongSelect)")]
+    public static void RebuildCreatorAndSelect()
+    {
+        if (!EditorSceneManager.SaveCurrentModifiedScenesIfUserWantsTo()) return;
+
+        EnsureFolder("Assets/Scenes");
+        EnsureFolder("Assets/Prefab");
+
+        s_cardPrefab = AssetDatabase.LoadAssetAtPath<GameObject>("Assets/Prefab/SongCard.prefab");
+        if (s_cardPrefab == null) s_cardPrefab = CreateSongCardPrefab();
+
+        BuildSongSelectScene();
+        BuildSongCreatorScene();
+
+        AssetDatabase.Refresh();
+        EditorUtility.DisplayDialog("완료",
+            "SongSelect + SongCreator 씬 재빌드 완료!\n\n" +
+            "Inspector에서 NasPublisher 비밀번호를 확인하세요.",
+            "확인");
+    }
+
     [MenuItem("Tools/VRBeatSaber/전체 자동 설정 (한 번만 실행)")]
     public static void SetupAll()
     {
@@ -140,6 +322,7 @@ public static class VRBeatSaberSceneBuilder
 
         // 탭
         var tabPanel    = MakePanel("TabPanel",    canvas.transform, new Vector2(0, 310),   new Vector2(1180, 60));
+        var backBtnSS   = MakeButton("BackButton",  tabPanel.transform, "< 뒤로", new Vector2(-500, 0), new Vector2(130, 50));
         var tabAllBtn   = MakeButton("TabAllBtn",   tabPanel.transform, "전체",   new Vector2(-290, 0), new Vector2(200, 50));
         var tabOwnedBtn = MakeButton("TabOwnedBtn", tabPanel.transform, "보유중", new Vector2(-80,  0), new Vector2(200, 50));
 
@@ -156,20 +339,22 @@ public static class VRBeatSaberSceneBuilder
         var infoTxt   = MakeTMP("InfoText",   detailGO.transform, "BPM | 길이", new Vector2(0, 160),  new Vector2(640, 30), 18);
 
         var diffPanel = MakePanel("DiffPanel", detailGO.transform, new Vector2(0, 90), new Vector2(640, 60));
-        var btnEasy   = MakeButton("EasyBtn",   diffPanel.transform, "Easy",   new Vector2(-240, 0), new Vector2(140, 50));
-        var btnNorm   = MakeButton("NormalBtn", diffPanel.transform, "Normal", new Vector2(-80,  0), new Vector2(140, 50));
-        var btnHard   = MakeButton("HardBtn",   diffPanel.transform, "Hard",   new Vector2(80,   0), new Vector2(140, 50));
-        var btnExp    = MakeButton("ExpertBtn", diffPanel.transform, "Expert", new Vector2(240,  0), new Vector2(140, 50));
+        var btnNorm   = MakeButton("NormalBtn",     diffPanel.transform, "Normal",   new Vector2(-240, 0), new Vector2(140, 50));
+        var btnHard   = MakeButton("HardBtn",       diffPanel.transform, "Hard",     new Vector2(-80,  0), new Vector2(140, 50));
+        var btnExp    = MakeButton("ExpertBtn",     diffPanel.transform, "Expert",   new Vector2(80,   0), new Vector2(140, 50));
+        var btnExpP   = MakeButton("ExpertPlusBtn", diffPanel.transform, "Expert+",  new Vector2(240,  0), new Vector2(140, 50));
 
         var actPanel = MakePanel("ActionPanel", detailGO.transform, new Vector2(0, 15), new Vector2(640, 60));
-        var dlBtn    = MakeButton("DownloadBtn", actPanel.transform, "▼ 다운로드", new Vector2(-165, 0), new Vector2(290, 50));
+        var dlBtn    = MakeButton("DownloadBtn", actPanel.transform, "다운로드", new Vector2(-165, 0), new Vector2(290, 50));
         var delBtn   = MakeButton("DeleteBtn",   actPanel.transform, "삭제",       new Vector2(165,  0), new Vector2(290, 50));
 
         var progGroup  = MakePanel("ProgressGroup",  detailGO.transform, new Vector2(0, -50), new Vector2(640, 40));
         var progSlider = MakeSlider("ProgressSlider", progGroup.transform, new Vector2(-70, 0), new Vector2(480, 28));
         var progText   = MakeTMP("ProgressText", progGroup.transform, "0%", new Vector2(275, 0), new Vector2(100, 30), 16);
 
-        var playBtn = MakeButton("PlayButton", detailGO.transform, "▶  플레이", new Vector2(0, -140), new Vector2(300, 65));
+        var playBtn   = MakeButton("PlayButton",   detailGO.transform, "플레이",  new Vector2(0, -140), new Vector2(300, 65));
+        var closeBtn  = MakeButton("CloseButton",  detailGO.transform, "X",        new Vector2(290, 270), new Vector2(50, 50));
+        closeBtn.GetComponent<Image>().color = new Color(0.6f, 0.15f, 0.15f);
 
         var loadingOvr = MakePanel("LoadingOverlay", canvas.transform, Vector2.zero, new Vector2(1200, 700));
         loadingOvr.GetComponent<Image>().color = new Color(0, 0, 0, 0.75f);
@@ -188,13 +373,14 @@ public static class VRBeatSaberSceneBuilder
         Bind(dso, "titleText",      titleTxt);
         Bind(dso, "artistText",     artistTxt);
         Bind(dso, "infoText",       infoTxt);
-        Bind(dso, "btnEasy",        btnEasy.GetComponent<Button>());
         Bind(dso, "btnNormal",      btnNorm.GetComponent<Button>());
         Bind(dso, "btnHard",        btnHard.GetComponent<Button>());
         Bind(dso, "btnExpert",      btnExp.GetComponent<Button>());
+        Bind(dso, "btnExpertPlus",  btnExpP.GetComponent<Button>());
         Bind(dso, "downloadButton", dlBtn.GetComponent<Button>());
         Bind(dso, "deleteButton",   delBtn.GetComponent<Button>());
         Bind(dso, "playButton",     playBtn.GetComponent<Button>());
+        Bind(dso, "closeButton",    closeBtn.GetComponent<Button>());
         Bind(dso, "progressGroup",  progGroup);
         Bind(dso, "progressSlider", progSlider);
         Bind(dso, "progressText",   progText);
@@ -203,6 +389,7 @@ public static class VRBeatSaberSceneBuilder
         // SongSelectManager 바인딩
         var mgr = canvas.AddComponent<SongSelectManager>();
         var mso = new SerializedObject(mgr);
+        Bind(mso, "backButton",      backBtnSS.GetComponent<Button>());
         Bind(mso, "tabAllBtn",       tabAllBtn.GetComponent<Button>());
         Bind(mso, "tabOwnedBtn",     tabOwnedBtn.GetComponent<Button>());
         Bind(mso, "cardContainer",   cardContainer);
@@ -236,48 +423,69 @@ public static class VRBeatSaberSceneBuilder
         var publisher = gm.AddComponent<NasPublisher>();
         var scMgr     = gm.AddComponent<SongCreatorManager>();
 
-        var canvas = MakeCanvas(new Vector2(900, 760), new Vector3(0, 1.5f, 2f));
+        var canvas = MakeCanvas(new Vector2(900, 800), new Vector3(0, 1.5f, 2f));
 
-        MakeTMP("TitleLabel", canvas.transform, "노래 만들기", new Vector2(0, 345), new Vector2(860, 55), 32);
+        MakeTMP("TitleLabel", canvas.transform, "노래 만들기", new Vector2(0, 365), new Vector2(860, 55), 32);
 
-        var audioPanel = MakePanel("AudioPanel", canvas.transform, new Vector2(0, 250), new Vector2(860, 90));
-        var audioDd    = MakeDropdown("AudioDropdown", audioPanel.transform, new Vector2(-120, 0), new Vector2(540, 60));
-        var refreshBtn = MakeButton("RefreshBtn", audioPanel.transform, "새로고침", new Vector2(255, 0), new Vector2(160, 58));
-        var pathHint   = MakeTMP("PathHint", canvas.transform, "", new Vector2(0, 195), new Vector2(860, 28), 13);
+        // 음원 선택 (드롭다운 + 새로고침)
+        var audioPanel = MakePanel("AudioPanel", canvas.transform, new Vector2(0, 280), new Vector2(860, 80));
+        var audioDd    = MakeDropdown("AudioDropdown", audioPanel.transform, new Vector2(-98, 0), new Vector2(540, 55));
+        var refreshBtn = MakeButton("RefreshBtn", audioPanel.transform, "새로고침", new Vector2(295, 0), new Vector2(160, 52));
+        var pathHint   = MakeTMP("PathHint", canvas.transform, "", new Vector2(0, 230), new Vector2(860, 26), 12);
+        pathHint.color = new Color(0.6f, 0.6f, 0.6f);
 
-        var metaPanel   = MakePanel("MetaPanel",   canvas.transform, new Vector2(0, 105), new Vector2(860, 110));
-        var titleInput  = MakeInputField("TitleInput",  metaPanel.transform, "곡 제목",  new Vector2(-280, 0), new Vector2(255, 55));
-        var artistInput = MakeInputField("ArtistInput", metaPanel.transform, "아티스트", new Vector2(0,    0), new Vector2(255, 55));
-        var bpmInput    = MakeInputField("BpmInput",    metaPanel.transform, "BPM",      new Vector2(280,  0), new Vector2(255, 55));
+        // 음원 추가 (파일 선택 / URL 다운로드)
+        var addPanel     = MakePanel("AddPanel", canvas.transform, new Vector2(0, 155), new Vector2(860, 100));
+        var addStatusTxt = MakeTMP("AddStatusText", addPanel.transform, "", new Vector2(90, 25), new Vector2(530, 36), 13);
+        addStatusTxt.color = new Color(0.7f, 0.9f, 0.7f);
+        var urlField    = MakeInputField("UrlInput", addPanel.transform, "MP3 직접 URL 입력", new Vector2(-100, 18), new Vector2(600, 40));
+        var urlDlBtn    = MakeButton("UrlDownloadBtn", addPanel.transform, "URL 다운로드", new Vector2(305, 20), new Vector2(195, 40));
+        var filePickBtn  = MakeButton("FilePickerBtn",  addPanel.transform, "파일 선택",     new Vector2(304, -29), new Vector2(195, 40));
 
-        var diffPanel  = MakePanel("DiffPanel", canvas.transform, new Vector2(0, -15), new Vector2(860, 65));
-        var togEasy    = MakeToggle("EasyToggle",   diffPanel.transform, "Easy",   new Vector2(-310, 0));
-        var togNormal  = MakeToggle("NormalToggle", diffPanel.transform, "Normal", new Vector2(-155, 0));
-        var togHard    = MakeToggle("HardToggle",   diffPanel.transform, "Hard",   new Vector2(0,    0));
-        var togExpert  = MakeToggle("ExpertToggle", diffPanel.transform, "Expert", new Vector2(155,  0));
-        togHard.isOn   = true;
-        togExpert.isOn = true;
+        // 메타데이터
+        var metaPanel   = MakePanel("MetaPanel",   canvas.transform, new Vector2(0, 55), new Vector2(860, 80));
+        var titleInput  = MakeInputField("TitleInput",  metaPanel.transform, "곡 제목",  new Vector2(-280, 0), new Vector2(255, 50));
+        var artistInput = MakeInputField("ArtistInput", metaPanel.transform, "아티스트", new Vector2(0,    0), new Vector2(255, 50));
+        var bpmInput    = MakeInputField("BpmInput",    metaPanel.transform, "BPM",      new Vector2(280,  0), new Vector2(255, 50));
 
-        var actPanel  = MakePanel("ActionPanel", canvas.transform, new Vector2(0, -125), new Vector2(860, 80));
-        var genBtn    = MakeButton("GenerateButton", actPanel.transform, "AI 생성 시작",  new Vector2(-175, 0), new Vector2(440, 65));
-        var manualBtn = MakeButton("ManualButton",   actPanel.transform, "직접 만들기 →", new Vector2(245,  0), new Vector2(185, 42));
+        // 난이도 토글 (Easy 제거, ExpertPlus 추가)
+        var diffPanel     = MakePanel("DiffPanel", canvas.transform, new Vector2(0, -45), new Vector2(860, 60));
+        var togNormal     = MakeToggle("NormalToggle",     diffPanel.transform, "Normal",   new Vector2(-206, 0));
+        var togHard       = MakeToggle("HardToggle",       diffPanel.transform, "Hard",     new Vector2(-51,  0));
+        var togExpert     = MakeToggle("ExpertToggle",     diffPanel.transform, "Expert",   new Vector2(104,  0));
+        var togExpertPlus = MakeToggle("ExpertPlusToggle", diffPanel.transform, "Expert+",  new Vector2(259,  0));
+        togNormal.isOn     = true;
+        togHard.isOn       = true;
+        togExpert.isOn     = true;
+        togExpertPlus.isOn = true;
 
-        var progGroup  = MakePanel("ProgressGroup",  canvas.transform, new Vector2(0, -250), new Vector2(860, 95));
-        var statusTxt  = MakeTMP("StatusText",    progGroup.transform, "", new Vector2(0, 28), new Vector2(840, 36), 18);
-        var progSlider = MakeSlider("ProgressSlider", progGroup.transform, new Vector2(0, -15), new Vector2(820, 28));
+        var backBtnSC = MakeButton("BackButton", canvas.transform, "< 뒤로", new Vector2(346, 365), new Vector2(130, 50));
+
+        var actPanel  = MakePanel("ActionPanel", canvas.transform, new Vector2(0, -145), new Vector2(860, 75));
+        var genBtn    = MakeButton("GenerateButton", actPanel.transform, "AI 생성 시작",  new Vector2(-175, 0), new Vector2(440, 60));
+        var manualBtn = MakeButton("ManualButton",   actPanel.transform, "직접 만들기 >", new Vector2(245,  0), new Vector2(185, 40));
+
+        var progGroup  = MakePanel("ProgressGroup",  canvas.transform, new Vector2(0, -265), new Vector2(860, 90));
+        var statusTxt  = MakeTMP("StatusText",    progGroup.transform, "", new Vector2(0, 25), new Vector2(840, 34), 17);
+        var progSlider = MakeSlider("ProgressSlider", progGroup.transform, new Vector2(0, -15), new Vector2(820, 26));
         progGroup.SetActive(false);
 
         var sso = new SerializedObject(scMgr);
         Bind(sso, "audioDropdown",      audioDd);
         Bind(sso, "refreshBtn",         refreshBtn.GetComponent<Button>());
         Bind(sso, "inputPathHint",      pathHint);
+        Bind(sso, "filePickerBtn",      filePickBtn.GetComponent<Button>());
+        Bind(sso, "addStatusText",      addStatusTxt);
+        Bind(sso, "urlInput",           urlField);
+        Bind(sso, "urlDownloadBtn",     urlDlBtn.GetComponent<Button>());
         Bind(sso, "titleInput",         titleInput);
         Bind(sso, "artistInput",        artistInput);
         Bind(sso, "bpmInput",           bpmInput);
-        Bind(sso, "toggleEasy",         togEasy);
         Bind(sso, "toggleNormal",       togNormal);
         Bind(sso, "toggleHard",         togHard);
         Bind(sso, "toggleExpert",       togExpert);
+        Bind(sso, "toggleExpertPlus",   togExpertPlus);
+        Bind(sso, "backButton",         backBtnSC.GetComponent<Button>());
         Bind(sso, "generateButton",     genBtn.GetComponent<Button>());
         Bind(sso, "manualEditorButton", manualBtn.GetComponent<Button>());
         Bind(sso, "progressGroup",      progGroup);
@@ -438,7 +646,9 @@ public static class VRBeatSaberSceneBuilder
     {
         var go  = new GameObject(name);
         go.transform.SetParent(parent, false);
-        go.AddComponent<Image>().color = new Color(0.08f, 0.08f, 0.08f, 0.88f);
+        var img = go.AddComponent<Image>();
+        img.color  = new Color(0.08f, 0.08f, 0.08f, 0.88f);
+        img.sprite = null;
         var rt  = go.GetComponent<RectTransform>();
         rt.anchoredPosition = pos;
         rt.sizeDelta        = size;
@@ -449,7 +659,9 @@ public static class VRBeatSaberSceneBuilder
     {
         var go = new GameObject(name);
         go.transform.SetParent(parent, false);
-        go.AddComponent<Image>().color = new Color(0.22f, 0.22f, 0.22f);
+        var img = go.AddComponent<Image>();
+        img.color  = new Color(0.22f, 0.22f, 0.22f);
+        img.sprite = null;
         go.AddComponent<Button>();
         var rt = go.GetComponent<RectTransform>();
         rt.anchoredPosition = pos;
@@ -472,7 +684,7 @@ public static class VRBeatSaberSceneBuilder
         var tmp = go.AddComponent<TextMeshProUGUI>();
         tmp.text      = text;
         tmp.fontSize  = fs;
-        tmp.alignment = TextAlignmentOptions.MidlineLeft;
+        tmp.alignment = TextAlignmentOptions.Center;
         var rt  = go.GetComponent<RectTransform>();
         rt.anchoredPosition = pos;
         rt.sizeDelta        = size;
@@ -483,7 +695,9 @@ public static class VRBeatSaberSceneBuilder
     {
         var go    = new GameObject(name);
         go.transform.SetParent(parent, false);
-        go.AddComponent<Image>().color = new Color(0.15f, 0.15f, 0.15f);
+        var fImg = go.AddComponent<Image>();
+        fImg.color  = new Color(0.15f, 0.15f, 0.15f);
+        fImg.sprite = null;
         var field = go.AddComponent<TMP_InputField>();
         var rt    = go.GetComponent<RectTransform>();
         rt.anchoredPosition = pos;
@@ -517,7 +731,9 @@ public static class VRBeatSaberSceneBuilder
     {
         var go = new GameObject(name);
         go.transform.SetParent(parent, false);
-        go.AddComponent<Image>().color = new Color(0.15f, 0.15f, 0.15f);
+        var ddImg = go.AddComponent<Image>();
+        ddImg.color  = new Color(0.15f, 0.15f, 0.15f);
+        ddImg.sprite = null;
         var dd = go.AddComponent<TMP_Dropdown>();
         var rt = go.GetComponent<RectTransform>();
         rt.anchoredPosition = pos;
diff --git a/Assets/Script/SongCreatorManager.cs b/Assets/Script/SongCreatorManager.cs
index 709e144..df5dc95 100644
--- a/Assets/Script/SongCreatorManager.cs
+++ b/Assets/Script/SongCreatorManager.cs
@@ -2,8 +2,10 @@ using System;
 using System.Collections;
 using System.Collections.Generic;
 using System.IO;
+using System.Threading;
 using TMPro;
 using UnityEngine;
+using UnityEngine.Networking;
 using UnityEngine.SceneManagement;
 using UnityEngine.UI;
 
@@ -12,7 +14,15 @@ public class SongCreatorManager : MonoBehaviour
     [Header("음원 선택")]
     [SerializeField] private TMP_Dropdown audioDropdown;
     [SerializeField] private Button       refreshBtn;
-    [SerializeField] private TMP_Text     inputPathHint; // 파일 넣는 경로 안내
+    [SerializeField] private TMP_Text     inputPathHint;
+
+    [Header("음원 추가 — 로컬 파일")]
+    [SerializeField] private Button       filePickerBtn;   // 파일 탐색 버튼
+    [SerializeField] private TMP_Text     addStatusText;   // 추가/다운로드 상태
+
+    [Header("음원 추가 — URL")]
+    [SerializeField] private TMP_InputField urlInput;          // MP3 직접 URL
+    [SerializeField] private Button         urlDownloadBtn;    // URL 다운로드 시작
 
     [Header("메타데이터")]
     [SerializeField] private TMP_InputField titleInput;
@@ -48,6 +58,7 @@ public class SongCreatorManager : MonoBehaviour
         Path.Combine(Application.persistentDataPath, "input");
 
     private readonly List<string> audioFiles = new();
+    private string _pendingFilePath; // 파일 다이얼로그 결과 (백그라운드 스레드 → 메인 스레드 전달)
 
     // ── Unity ────────────────────────────────────────────────
 
@@ -58,15 +69,40 @@ public class SongCreatorManager : MonoBehaviour
         if (inputPathHint != null)
             inputPathHint.text = $"음원 경로: {InputPath}";
 
+        // 씬에서 아무 토글도 안 선택되어 있으면 전부 켜기
+        bool anyOn = (toggleNormal     != null && toggleNormal.isOn)
+                  || (toggleHard       != null && toggleHard.isOn)
+                  || (toggleExpert     != null && toggleExpert.isOn)
+                  || (toggleExpertPlus != null && toggleExpertPlus.isOn);
+        if (!anyOn)
+        {
+            if (toggleNormal     != null) toggleNormal.isOn     = true;
+            if (toggleHard       != null) toggleHard.isOn       = true;
+            if (toggleExpert     != null) toggleExpert.isOn     = true;
+            if (toggleExpertPlus != null) toggleExpertPlus.isOn = true;
+        }
+
         refreshBtn.onClick.AddListener(RefreshAudioList);
         generateButton.onClick.AddListener(OnGenerateClicked);
         manualEditorButton.onClick.AddListener(() => SceneManager.LoadScene(mapEditorScene));
         backButton?.onClick.AddListener(() => SceneManager.LoadScene(introSceneName));
+        if (filePickerBtn != null) filePickerBtn.onClick.AddListener(OnFilePickerClicked);
+        if (urlDownloadBtn != null) urlDownloadBtn.onClick.AddListener(OnUrlDownloadClicked);
 
         progressGroup.SetActive(false);
         RefreshAudioList();
     }
 
+    private void Update()
+    {
+        // 파일 다이얼로그는 STA 스레드에서 실행되므로 결과를 메인 스레드에서 처리
+        if (_pendingFilePath != null)
+        {
+            CopyToInput(_pendingFilePath);
+            _pendingFilePath = null;
+        }
+    }
+
     // ── 음원 목록 갱신 ───────────────────────────────────────
 
     private void RefreshAudioList()
@@ -99,10 +135,10 @@ public class SongCreatorManager : MonoBehaviour
                                               { SetStatus("BPM을 올바르게 입력해주세요."); return; }
 
         var diffs = new List<string>();
-        if (toggleNormal.isOn)    diffs.Add("normal");
-        if (toggleHard.isOn)      diffs.Add("hard");
-        if (toggleExpert.isOn)    diffs.Add("expert");
-        if (toggleExpertPlus.isOn) diffs.Add("expertplus");
+        if (toggleNormal     != null && toggleNormal.isOn)     diffs.Add("normal");
+        if (toggleHard       != null && toggleHard.isOn)       diffs.Add("hard");
+        if (toggleExpert     != null && toggleExpert.isOn)     diffs.Add("expert");
+        if (toggleExpertPlus != null && toggleExpertPlus.isOn) diffs.Add("expertplus");
 
         if (diffs.Count == 0) { SetStatus("난이도를 하나 이상 선택해주세요."); return; }
 
@@ -218,5 +254,102 @@ public class SongCreatorManager : MonoBehaviour
         manualEditorButton.interactable = value;
         audioDropdown.interactable      = value;
         refreshBtn.interactable         = value;
+        if (filePickerBtn  != null) filePickerBtn.interactable  = value;
+        if (urlDownloadBtn != null) urlDownloadBtn.interactable = value;
+    }
+
+    // ── 로컬 파일 선택 ────────────────────────────────────────
+
+    private void OnFilePickerClicked()
+    {
+#if UNITY_EDITOR
+        string path = UnityEditor.EditorUtility.OpenFilePanel("음원 파일 선택", "", "mp3");
+        if (!string.IsNullOrEmpty(path)) CopyToInput(path);
+#elif UNITY_STANDALONE_WIN
+        var t = new Thread(() =>
+        {
+            var dlg = new System.Windows.Forms.OpenFileDialog
+            {
+                Filter = "MP3 파일|*.mp3",
+                Title  = "음원 파일 선택"
+            };
+            if (dlg.ShowDialog() == System.Windows.Forms.DialogResult.OK)
+                _pendingFilePath = dlg.FileName;
+        });
+        t.SetApartmentState(ApartmentState.STA);
+        t.Start();
+#else
+        SetAddStatus($"ADB로 파일을 추가하세요:\n{InputPath}");
+#endif
+    }
+
+    private void CopyToInput(string srcPath)
+    {
+        try
+        {
+            string dest = Path.Combine(InputPath, Path.GetFileName(srcPath));
+            File.Copy(srcPath, dest, overwrite: true);
+            RefreshAudioList();
+            string nameNoExt = Path.GetFileNameWithoutExtension(srcPath);
+            int idx = audioFiles.FindIndex(f => Path.GetFileNameWithoutExtension(f) == nameNoExt);
+            if (idx >= 0) audioDropdown.value = idx;
+            SetAddStatus($"추가됨: {Path.GetFileName(srcPath)}");
+        }
+        catch (Exception e)
+        {
+            SetAddStatus($"파일 추가 실패: {e.Message}");
+        }
+    }
+
+    // ── URL 다운로드 ──────────────────────────────────────────
+
+    private void OnUrlDownloadClicked()
+    {
+        string url = urlInput != null ? urlInput.text.Trim() : "";
+        if (string.IsNullOrEmpty(url)) { SetAddStatus("URL을 입력해주세요."); return; }
+        StartCoroutine(DownloadFromUrl(url));
+    }
+
+    private IEnumerator DownloadFromUrl(string url)
+    {
+        SetAddStatus("다운로드 중...");
+        if (urlDownloadBtn != null) urlDownloadBtn.interactable = false;
+
+        string fileName;
+        try
+        {
+            string uriPath = new Uri(url).AbsolutePath;
+            fileName = Path.GetFileName(uriPath);
+            if (string.IsNullOrEmpty(fileName) || !fileName.EndsWith(".mp3", StringComparison.OrdinalIgnoreCase))
+                fileName = "download.mp3";
+        }
+        catch { fileName = "download.mp3"; }
+
+        string savePath = Path.GetFullPath(Path.Combine(InputPath, fileName));
+
+        using var req = UnityWebRequest.Get(url);
+        req.downloadHandler = new DownloadHandlerFile(savePath);
+        yield return req.SendWebRequest();
+
+        if (urlDownloadBtn != null) urlDownloadBtn.interactable = true;
+
+        if (req.result == UnityWebRequest.Result.Success)
+        {
+            RefreshAudioList();
+            string nameNoExt = Path.GetFileNameWithoutExtension(fileName);
+            int idx = audioFiles.FindIndex(f => Path.GetFileNameWithoutExtension(f) == nameNoExt);
+            if (idx >= 0) audioDropdown.value = idx;
+            SetAddStatus($"다운로드 완료: {fileName}");
+        }
+        else
+        {
+            if (File.Exists(savePath)) File.Delete(savePath);
+            SetAddStatus($"다운로드 실패: {req.error}");
+        }
+    }
+
+    private void SetAddStatus(string msg)
+    {
+        if (addStatusText != null) addStatusText.text = msg;
     }
 }
diff --git a/Assets/Script/Spawner.cs b/Assets/Script/Spawner.cs
index 4d20b21..f181a25 100644
--- a/Assets/Script/Spawner.cs
+++ b/Assets/Script/Spawner.cs
@@ -2,6 +2,7 @@ using System.Collections;
 using System.Collections.Generic;
 using System.IO;
 using UnityEngine;
+using UnityEngine.InputSystem;
 using UnityEngine.Networking;
 using UnityEngine.SceneManagement;
 
@@ -21,6 +22,10 @@ public class Spawner : MonoBehaviour
     [Header("씬 설정")]
     public string songSelectSceneName = "SongSelect";
 
+    [Header("뒤로가기 입력")]
+    [Tooltip("Quest B/Y 버튼을 뒤로가기로 쓸 InputAction (선택)")]
+    [SerializeField] private InputActionReference backAction;
+
     private List<NoteData> mapNotes      = new List<NoteData>();
     private int            nextNoteIndex = 0;
     private float          travelTime;
@@ -28,6 +33,16 @@ public class Spawner : MonoBehaviour
 
     // ── Unity ────────────────────────────────────────────────
 
+    void Awake()
+    {
+        // PlayOnAwake가 OnEnable에서 발동하기 전에 차단
+        if (audioSource != null)
+        {
+            audioSource.playOnAwake = false;
+            audioSource.clip        = null;
+        }
+    }
+
     void Start()
     {
         travelTime = distanceToHit / noteSpeed;
@@ -44,6 +59,10 @@ public class Spawner : MonoBehaviour
 
     void Update()
     {
+        // 뒤로가기: Quest B/Y 버튼 (PC ESC는 DesktopUIMode가 처리)
+        bool goBack = backAction != null && backAction.action.WasPressedThisFrame();
+        if (goBack) { SceneManager.LoadScene(songSelectSceneName); return; }
+
         if (!isReady || audioSource == null || !audioSource.isPlaying) return;
 
         float currentTime = audioSource.time;
@@ -62,25 +81,66 @@ public class Spawner : MonoBehaviour
         SongInfo song       = GameSession.SelectedSong;
         string   difficulty = GameSession.SelectedDifficulty;
 
-        // 맵 JSON 로드
+        // ── 기본 연결 확인 ───────────────────────────────────────
+        if (audioSource == null)
+        {
+            Debug.LogError("[Spawner] AudioSource 미연결 — Inspector에서 AudioSource 연결 필요");
+            yield break;
+        }
+        if (song == null)
+        {
+            Debug.LogError("[Spawner] GameSession.SelectedSong == null — SongSelect에서 곡을 선택하고 Play를 눌러야 합니다");
+            yield break;
+        }
+        if (string.IsNullOrEmpty(difficulty))
+        {
+            Debug.LogError("[Spawner] GameSession.SelectedDifficulty 비어있음");
+            yield break;
+        }
+
+        Debug.Log($"[Spawner] 시작: song={song.title}({song.id}), diff={difficulty}");
+
+        // ── 맵 JSON 로드 ─────────────────────────────────────────
         string mapPath = GetMapPath(song, difficulty);
+        Debug.Log($"[Spawner] 맵 경로: {mapPath}");
+
+        if (string.IsNullOrEmpty(mapPath))
+        {
+            Debug.LogError($"[Spawner] songs.json에 '{difficulty}' mapFile 없음 — NAS 재업로드 필요");
+            yield break;
+        }
         if (!File.Exists(mapPath))
         {
-            Debug.LogError($"[Spawner] 맵 파일 없음: {mapPath}");
+            Debug.LogError($"[Spawner] 맵 파일 없음: {mapPath}\n→ SongSelect에서 다운로드하세요");
             yield break;
         }
         LoadMapJson(mapPath);
 
-        // 오디오 로드 (로컬 파일 → AudioClip)
+        // ── 오디오 로드 ──────────────────────────────────────────
+        audioSource.Stop();
+        audioSource.clip = null;
+
         string audioPath = GetAudioPath(song.id);
+        Debug.Log($"[Spawner] 오디오 경로: {audioPath}");
+
+        if (!File.Exists(audioPath))
+        {
+            Debug.LogError($"[Spawner] 오디오 파일 없음: {audioPath}\n→ SongSelect에서 다운로드하세요");
+            yield break;
+        }
+
         yield return LoadAudioClip(audioPath);
 
-        // LRU 갱신
-        SongLibrary.Instance?.TouchSong(song.id);
+        if (audioSource.clip == null)
+        {
+            Debug.LogError("[Spawner] 오디오 클립 로드 실패 (파일 손상 또는 형식 오류)");
+            yield break;
+        }
 
+        SongLibrary.Instance?.TouchSong(song.id);
         isReady = true;
         audioSource.Play();
-        Debug.Log($"[Spawner] 시작: {song.title} ({difficulty})");
+        Debug.Log($"[Spawner] 재생 시작: {song.title} / {difficulty} / 노트:{mapNotes.Count}개");
     }
 
     private void LoadMapJson(string path)