diff --git a/extensions/iframe.js b/extensions/iframe.js
index e39a89af4d..6d67744416 100644
--- a/extensions/iframe.js
+++ b/extensions/iframe.js
@@ -4,12 +4,16 @@
 // Context: "iframe" is an HTML element that lets websites embed other websites.
 // License: MIT AND MPL-2.0
 
+// Edited by izum00
+
 (function (Scratch) {
   "use strict";
 
-  /** @type {HTMLIFrameElement|null} */
-  let iframe = null;
-  let overlay = null;
+  /** @type {Object.<string, {iframe: HTMLIFrameElement, overlay: any, x: number, y: number, width: number, height: number, interactive: boolean, resizeBehavior: string, latestMessage: string|number|boolean}>} */
+  const iframes = {};
+
+  // ブロックモードを管理する変数 (デフォルトは古いブロック)
+  let useNewBlocks = true;
 
   const featurePolicy = {
     accelerometer: "'none'",
@@ -47,20 +51,17 @@
     // The big one we don't want to include is allow-top-navigation
   ];
 
-  let x = 0;
-  let y = 0;
-  let width = -1; // negative means default
-  let height = -1; // negative means default
-  let interactive = true;
-  let resizeBehavior = "scale";
-  /** @type {string|number|boolean} */
-  let latestMessage = "";
-
-  const updateFrameAttributes = () => {
-    if (!iframe) {
+  const getOverlayMode = (resizeBehavior) =>
+    resizeBehavior === "scale" ? "scale-centered" : "manual";
+
+  const updateFrameAttributes = (id) => {
+    const iframeData = iframes[id];
+    if (!iframeData || !iframeData.iframe) {
       return;
     }
 
+    const { iframe, x, y, width, height, interactive, resizeBehavior } =
+      iframeData;
     iframe.style.pointerEvents = interactive ? "auto" : "none";
 
     const { stageWidth, stageHeight } = Scratch.vm.runtime;
@@ -91,11 +92,8 @@
     }
   };
 
-  const getOverlayMode = () =>
-    resizeBehavior === "scale" ? "scale-centered" : "manual";
-
-  const createFrame = (src) => {
-    iframe = document.createElement("iframe");
+  const createFrame = (src, id) => {
+    const iframe = document.createElement("iframe");
     iframe.style.width = "100%";
     iframe.style.height = "100%";
     iframe.style.border = "none";
@@ -108,183 +106,497 @@
         .join("; ")
     );
     iframe.setAttribute("allowtransparency", "true");
-    iframe.setAttribute("allowtransparency", "true");
     iframe.setAttribute("src", src);
+    iframe.setAttribute("data-iframe-id", id);
+
+    const overlay = Scratch.renderer.addOverlay(
+      iframe,
+      getOverlayMode("scale")
+    );
+
+    iframes[id] = {
+      iframe,
+      overlay,
+      x: 0,
+      y: 0,
+      width: -1,
+      height: -1,
+      interactive: true,
+      resizeBehavior: "scale",
+      latestMessage: "",
+    };
+
+    updateFrameAttributes(id);
+    return id;
+  };
 
-    overlay = Scratch.renderer.addOverlay(iframe, getOverlayMode());
-    updateFrameAttributes();
+  const closeFrame = (id) => {
+    const iframeData = iframes[id];
+    if (iframeData) {
+      Scratch.renderer.removeOverlay(iframeData.iframe);
+      delete iframes[id];
+    }
   };
 
-  const closeFrame = () => {
-    if (iframe) {
-      Scratch.renderer.removeOverlay(iframe);
-      iframe = null;
-      overlay = null;
+  const getIframeData = (id) => {
+    if (!iframes[id]) {
+      // デフォルト値を持つ新しいiframeデータを作成（非表示）
+      iframes[id] = {
+        iframe: null,
+        overlay: null,
+        x: 0,
+        y: 0,
+        width: -1,
+        height: -1,
+        interactive: true,
+        resizeBehavior: "scale",
+        latestMessage: "",
+      };
     }
+    return iframes[id];
   };
 
   window.addEventListener("message", (e) => {
-    if (iframe && iframe.contentWindow && e.source === iframe.contentWindow) {
-      latestMessage =
-        typeof e.data === "string" ||
-        typeof e.data === "number" ||
-        typeof e.data === "boolean"
-          ? e.data
-          : JSON.stringify(e.data);
-      Scratch.vm.runtime.startHats("iframe_whenMessage");
+    // すべてのiframeをチェックしてメッセージの送信元を特定
+    for (const id in iframes) {
+      const iframeData = iframes[id];
+      if (
+        iframeData.iframe &&
+        iframeData.iframe.contentWindow &&
+        e.source === iframeData.iframe.contentWindow
+      ) {
+        iframeData.latestMessage =
+          typeof e.data === "string" ||
+          typeof e.data === "number" ||
+          typeof e.data === "boolean"
+            ? e.data
+            : JSON.stringify(e.data);
+        Scratch.vm.runtime.startHats("iframe_whenMessage", {
+          IFRAME_ID: id,
+        });
+        Scratch.vm.runtime.startHats("iframe_whenMessage_new", {
+          IFRAME_ID: id,
+        });
+        break;
+      }
     }
   });
 
-  Scratch.vm.on("STAGE_SIZE_CHANGED", updateFrameAttributes);
+  Scratch.vm.on("STAGE_SIZE_CHANGED", () => {
+    for (const id in iframes) {
+      updateFrameAttributes(id);
+    }
+  });
 
-  Scratch.vm.runtime.on("RUNTIME_DISPOSED", closeFrame);
+  Scratch.vm.runtime.on("RUNTIME_DISPOSED", () => {
+    for (const id in iframes) {
+      closeFrame(id);
+    }
+  });
 
   class IframeExtension {
     getInfo() {
-      return {
-        name: Scratch.translate("Iframe"),
-        id: "iframe",
-        blocks: [
-          {
-            opcode: "display",
-            blockType: Scratch.BlockType.COMMAND,
-            text: Scratch.translate("show website [URL]"),
-            arguments: {
-              URL: {
-                type: Scratch.ArgumentType.STRING,
-                defaultValue: "https://extensions.turbowarp.org/hello.html",
-              },
+      const oldBlocks = [
+        {
+          opcode: "display_new",
+          blockType: Scratch.BlockType.COMMAND,
+          text: Scratch.translate("show website [URL] as [ID]"),
+          hideFromPalette: useNewBlocks,
+          arguments: {
+            URL: {
+              type: Scratch.ArgumentType.STRING,
+              defaultValue: "https://extensions.turbowarp.org/hello.html",
+            },
+            ID: {
+              type: Scratch.ArgumentType.STRING,
+              defaultValue: "iframe1",
             },
           },
-          {
-            opcode: "displayHTML",
-            blockType: Scratch.BlockType.COMMAND,
-            text: Scratch.translate("show HTML [HTML]"),
-            arguments: {
-              HTML: {
-                type: Scratch.ArgumentType.STRING,
-                defaultValue: `<h1>${Scratch.translate("It works!")}</h1>`,
-              },
+        },
+        {
+          opcode: "displayHTML_new",
+          blockType: Scratch.BlockType.COMMAND,
+          text: Scratch.translate("show HTML [HTML] as [ID]"),
+          hideFromPalette: useNewBlocks,
+          arguments: {
+            HTML: {
+              type: Scratch.ArgumentType.STRING,
+              defaultValue: `<h1>${Scratch.translate("It works!")}</h1>`,
+            },
+            ID: {
+              type: Scratch.ArgumentType.STRING,
+              defaultValue: "iframe1",
             },
           },
-          "---",
-          {
-            opcode: "show",
-            blockType: Scratch.BlockType.COMMAND,
-            text: Scratch.translate("show iframe"),
+        },
+        "---",
+        {
+          opcode: "show_new",
+          blockType: Scratch.BlockType.COMMAND,
+          text: Scratch.translate("show iframe [ID]"),
+          hideFromPalette: useNewBlocks,
+          arguments: {
+            ID: {
+              type: Scratch.ArgumentType.STRING,
+              defaultValue: "iframe1",
+            },
           },
-          {
-            opcode: "hide",
-            blockType: Scratch.BlockType.COMMAND,
-            text: Scratch.translate("hide iframe"),
+        },
+        {
+          opcode: "hide_new",
+          blockType: Scratch.BlockType.COMMAND,
+          text: Scratch.translate("hide iframe [ID]"),
+          hideFromPalette: useNewBlocks,
+          arguments: {
+            ID: {
+              type: Scratch.ArgumentType.STRING,
+              defaultValue: "iframe1",
+            },
           },
-          {
-            opcode: "close",
-            blockType: Scratch.BlockType.COMMAND,
-            text: Scratch.translate("close iframe"),
+        },
+        {
+          opcode: "close_new",
+          blockType: Scratch.BlockType.COMMAND,
+          text: Scratch.translate("close iframe [ID]"),
+          hideFromPalette: useNewBlocks,
+          arguments: {
+            ID: {
+              type: Scratch.ArgumentType.STRING,
+              defaultValue: "iframe1",
+            },
           },
-          "---",
-          {
-            opcode: "get",
-            blockType: Scratch.BlockType.REPORTER,
-            text: Scratch.translate("iframe [MENU]"),
-            arguments: {
-              MENU: {
-                type: Scratch.ArgumentType.STRING,
-                menu: "getMenu",
-              },
+        },
+        "---",
+        {
+          opcode: "get_new",
+          blockType: Scratch.BlockType.REPORTER,
+          text: Scratch.translate("iframe [ID] [MENU]"),
+          hideFromPalette: useNewBlocks,
+          arguments: {
+            ID: {
+              type: Scratch.ArgumentType.STRING,
+              defaultValue: "iframe1",
+            },
+            MENU: {
+              type: Scratch.ArgumentType.STRING,
+              menu: "getMenu",
             },
           },
-          {
-            opcode: "setX",
-            blockType: Scratch.BlockType.COMMAND,
-            text: Scratch.translate("set iframe x position to [X]"),
-            arguments: {
-              X: {
-                type: Scratch.ArgumentType.NUMBER,
-                defaultValue: "0",
-              },
+        },
+        {
+          opcode: "setX_new",
+          blockType: Scratch.BlockType.COMMAND,
+          text: Scratch.translate("set iframe [ID] x position to [X]"),
+          hideFromPalette: useNewBlocks,
+          arguments: {
+            ID: {
+              type: Scratch.ArgumentType.STRING,
+              defaultValue: "iframe1",
+            },
+            X: {
+              type: Scratch.ArgumentType.NUMBER,
+              defaultValue: "0",
             },
           },
-          {
-            opcode: "setY",
-            blockType: Scratch.BlockType.COMMAND,
-            text: Scratch.translate("set iframe y position to [Y]"),
-            arguments: {
-              Y: {
-                type: Scratch.ArgumentType.NUMBER,
-                defaultValue: "0",
-              },
+        },
+        {
+          opcode: "setY_new",
+          blockType: Scratch.BlockType.COMMAND,
+          text: Scratch.translate("set iframe [ID] y position to [Y]"),
+          hideFromPalette: useNewBlocks,
+          arguments: {
+            ID: {
+              type: Scratch.ArgumentType.STRING,
+              defaultValue: "iframe1",
+            },
+            Y: {
+              type: Scratch.ArgumentType.NUMBER,
+              defaultValue: "0",
             },
           },
-          {
-            opcode: "setWidth",
-            blockType: Scratch.BlockType.COMMAND,
-            text: Scratch.translate("set iframe width to [WIDTH]"),
-            arguments: {
-              WIDTH: {
-                type: Scratch.ArgumentType.NUMBER,
-                defaultValue: Scratch.vm.runtime.stageWidth,
-              },
+        },
+        {
+          opcode: "setWidth_new",
+          blockType: Scratch.BlockType.COMMAND,
+          text: Scratch.translate("set iframe [ID] width to [WIDTH]"),
+          hideFromPalette: useNewBlocks,
+          arguments: {
+            ID: {
+              type: Scratch.ArgumentType.STRING,
+              defaultValue: "iframe1",
+            },
+            WIDTH: {
+              type: Scratch.ArgumentType.NUMBER,
+              defaultValue: Scratch.vm.runtime.stageWidth,
             },
           },
-          {
-            opcode: "setHeight",
-            blockType: Scratch.BlockType.COMMAND,
-            text: Scratch.translate("set iframe height to [HEIGHT]"),
-            arguments: {
-              HEIGHT: {
-                type: Scratch.ArgumentType.NUMBER,
-                defaultValue: Scratch.vm.runtime.stageHeight,
-              },
+        },
+        {
+          opcode: "setHeight_new",
+          blockType: Scratch.BlockType.COMMAND,
+          text: Scratch.translate("set iframe [ID] height to [HEIGHT]"),
+          hideFromPalette: useNewBlocks,
+          arguments: {
+            ID: {
+              type: Scratch.ArgumentType.STRING,
+              defaultValue: "iframe1",
+            },
+            HEIGHT: {
+              type: Scratch.ArgumentType.NUMBER,
+              defaultValue: Scratch.vm.runtime.stageHeight,
             },
           },
-          {
-            opcode: "setInteractive",
-            blockType: Scratch.BlockType.COMMAND,
-            text: Scratch.translate("set iframe interactive to [INTERACTIVE]"),
-            arguments: {
-              INTERACTIVE: {
-                type: Scratch.ArgumentType.STRING,
-                menu: "interactiveMenu",
-              },
+        },
+        {
+          opcode: "setInteractive_new",
+          blockType: Scratch.BlockType.COMMAND,
+          text: Scratch.translate(
+            "set iframe [ID] interactive to [INTERACTIVE]"
+          ),
+          hideFromPalette: useNewBlocks,
+          arguments: {
+            ID: {
+              type: Scratch.ArgumentType.STRING,
+              defaultValue: "iframe1",
+            },
+            INTERACTIVE: {
+              type: Scratch.ArgumentType.STRING,
+              menu: "interactiveMenu",
             },
           },
-          {
-            opcode: "setResize",
-            blockType: Scratch.BlockType.COMMAND,
-            text: Scratch.translate("set iframe resize behavior to [RESIZE]"),
-            arguments: {
-              RESIZE: {
-                type: Scratch.ArgumentType.STRING,
-                menu: "resizeMenu",
-              },
+        },
+        {
+          opcode: "setResize_new",
+          blockType: Scratch.BlockType.COMMAND,
+          text: Scratch.translate(
+            "set iframe [ID] resize behavior to [RESIZE]"
+          ),
+          hideFromPalette: useNewBlocks,
+          arguments: {
+            ID: {
+              type: Scratch.ArgumentType.STRING,
+              defaultValue: "iframe1",
+            },
+            RESIZE: {
+              type: Scratch.ArgumentType.STRING,
+              menu: "resizeMenu",
             },
           },
-          "---",
-          {
-            opcode: "sendMessage",
-            blockType: Scratch.BlockType.COMMAND,
-            text: Scratch.translate("send message [MESSAGE] to iframe"),
-            arguments: {
-              MESSAGE: {
-                type: Scratch.ArgumentType.STRING,
-                defaultValue: "hello",
-              },
+        },
+        "---",
+        {
+          opcode: "sendMessage_new",
+          blockType: Scratch.BlockType.COMMAND,
+          text: Scratch.translate("send message [MESSAGE] to iframe [ID]"),
+          hideFromPalette: useNewBlocks,
+          arguments: {
+            ID: {
+              type: Scratch.ArgumentType.STRING,
+              defaultValue: "iframe1",
+            },
+            MESSAGE: {
+              type: Scratch.ArgumentType.STRING,
+              defaultValue: "hello",
+            },
+          },
+        },
+        {
+          opcode: "whenMessage_new",
+          blockType: Scratch.BlockType.EVENT,
+          text: Scratch.translate("when message received from iframe"),
+          hideFromPalette: useNewBlocks,
+          isEdgeActivated: false,
+        },
+        {
+          opcode: "iframeMessage_new",
+          blockType: Scratch.BlockType.REPORTER,
+          text: Scratch.translate("message from iframe [ID]"),
+          hideFromPalette: useNewBlocks,
+          arguments: {
+            ID: {
+              type: Scratch.ArgumentType.STRING,
+              defaultValue: "iframe1",
+            },
+          },
+        },
+        {
+          opcode: "lastMessageId_new",
+          blockType: Scratch.BlockType.REPORTER,
+          text: Scratch.translate("ID of iframe that sent last message"),
+          hideFromPalette: useNewBlocks,
+        },
+      ];
+
+      const newBlocks = [
+        {
+          opcode: "display",
+          blockType: Scratch.BlockType.COMMAND,
+          text: Scratch.translate("show website [URL]"),
+          hideFromPalette: !useNewBlocks,
+          arguments: {
+            URL: {
+              type: Scratch.ArgumentType.STRING,
+              defaultValue: "https://extensions.turbowarp.org/hello.html",
+            },
+          },
+        },
+        {
+          opcode: "displayHTML",
+          blockType: Scratch.BlockType.COMMAND,
+          text: Scratch.translate("show HTML [HTML]"),
+          hideFromPalette: !useNewBlocks,
+          arguments: {
+            HTML: {
+              type: Scratch.ArgumentType.STRING,
+              defaultValue: `<h1>${Scratch.translate("It works!")}</h1>`,
+            },
+          },
+        },
+        "---",
+        {
+          opcode: "show",
+          blockType: Scratch.BlockType.COMMAND,
+          text: Scratch.translate("show iframe"),
+          hideFromPalette: !useNewBlocks,
+        },
+        {
+          opcode: "hide",
+          blockType: Scratch.BlockType.COMMAND,
+          text: Scratch.translate("hide iframe"),
+          hideFromPalette: !useNewBlocks,
+        },
+        {
+          opcode: "close",
+          blockType: Scratch.BlockType.COMMAND,
+          text: Scratch.translate("close iframe"),
+          hideFromPalette: !useNewBlocks,
+        },
+        "---",
+        {
+          opcode: "get",
+          blockType: Scratch.BlockType.REPORTER,
+          text: Scratch.translate("iframe [MENU]"),
+          hideFromPalette: !useNewBlocks,
+          arguments: {
+            MENU: {
+              type: Scratch.ArgumentType.STRING,
+              menu: "getMenu",
+            },
+          },
+        },
+        {
+          opcode: "setX",
+          blockType: Scratch.BlockType.COMMAND,
+          text: Scratch.translate("set iframe x position to [X]"),
+          hideFromPalette: !useNewBlocks,
+          arguments: {
+            X: {
+              type: Scratch.ArgumentType.NUMBER,
+              defaultValue: "0",
+            },
+          },
+        },
+        {
+          opcode: "setY",
+          blockType: Scratch.BlockType.COMMAND,
+          text: Scratch.translate("set iframe y position to [Y]"),
+          hideFromPalette: !useNewBlocks,
+          arguments: {
+            Y: {
+              type: Scratch.ArgumentType.NUMBER,
+              defaultValue: "0",
+            },
+          },
+        },
+        {
+          opcode: "setWidth",
+          blockType: Scratch.BlockType.COMMAND,
+          text: Scratch.translate("set iframe width to [WIDTH]"),
+          hideFromPalette: !useNewBlocks,
+          arguments: {
+            WIDTH: {
+              type: Scratch.ArgumentType.NUMBER,
+              defaultValue: Scratch.vm.runtime.stageWidth,
             },
           },
-          {
-            opcode: "whenMessage",
-            blockType: Scratch.BlockType.EVENT,
-            text: Scratch.translate("when message received from iframe"),
-            isEdgeActivated: false,
+        },
+        {
+          opcode: "setHeight",
+          blockType: Scratch.BlockType.COMMAND,
+          text: Scratch.translate("set iframe height to [HEIGHT]"),
+          hideFromPalette: !useNewBlocks,
+          arguments: {
+            HEIGHT: {
+              type: Scratch.ArgumentType.NUMBER,
+              defaultValue: Scratch.vm.runtime.stageHeight,
+            },
+          },
+        },
+        {
+          opcode: "setInteractive",
+          blockType: Scratch.BlockType.COMMAND,
+          text: Scratch.translate("set iframe interactive to [INTERACTIVE]"),
+          hideFromPalette: !useNewBlocks,
+          arguments: {
+            INTERACTIVE: {
+              type: Scratch.ArgumentType.STRING,
+              menu: "interactiveMenu",
+            },
           },
-          {
-            opcode: "iframeMessage",
-            blockType: Scratch.BlockType.REPORTER,
-            text: Scratch.translate("iframe message"),
+        },
+        {
+          opcode: "setResize",
+          blockType: Scratch.BlockType.COMMAND,
+          text: Scratch.translate("set iframe resize behavior to [RESIZE]"),
+          hideFromPalette: !useNewBlocks,
+          arguments: {
+            RESIZE: {
+              type: Scratch.ArgumentType.STRING,
+              menu: "resizeMenu",
+            },
+          },
+        },
+        "---",
+        {
+          opcode: "sendMessage",
+          blockType: Scratch.BlockType.COMMAND,
+          text: Scratch.translate("send message [MESSAGE] to iframe"),
+          hideFromPalette: !useNewBlocks,
+          arguments: {
+            MESSAGE: {
+              type: Scratch.ArgumentType.STRING,
+              defaultValue: "hello",
+            },
           },
-        ],
+        },
+        {
+          opcode: "whenMessage",
+          blockType: Scratch.BlockType.EVENT,
+          text: Scratch.translate("when message received from iframe"),
+          hideFromPalette: !useNewBlocks,
+          isEdgeActivated: false,
+        },
+        {
+          opcode: "iframeMessage",
+          blockType: Scratch.BlockType.REPORTER,
+          text: Scratch.translate("iframe message"),
+          hideFromPalette: !useNewBlocks,
+        },
+      ];
+
+      const modeSwitchBlock = {
+        opcode: "switchMode",
+        blockType: Scratch.BlockType.BUTTON,
+        text: !useNewBlocks
+          ? Scratch.translate("Switch to Old Blocks [▶]")
+          : Scratch.translate("Switch to New Blocks [▶]"),
+        func: "switchMode",
+      };
+
+      return {
+        name: Scratch.translate("Iframe+"),
+        id: "iframeplus",
+        blocks: [modeSwitchBlock, "---", ...oldBlocks, ...newBlocks],
         menus: {
           getMenu: {
             acceptReporters: true,
@@ -324,107 +636,306 @@
       };
     }
 
+    switchMode() {
+      useNewBlocks = !useNewBlocks;
+      // ブロックパレットを更新
+      Scratch.vm.extensionManager.refreshBlocks();
+    }
+
+    // 新しいブロックの実装 (単一iframe用 - IDは"iframe"固定)
     async display({ URL }) {
-      closeFrame();
+      const ID = "iframe";
+      closeFrame(ID);
       if (await Scratch.canEmbed(URL)) {
-        createFrame(Scratch.Cast.toString(URL));
+        createFrame(Scratch.Cast.toString(URL), ID);
       }
     }
 
     async displayHTML({ HTML }) {
-      closeFrame();
-      const url = `data:text/html;,${encodeURIComponent(
+      const ID = "iframe";
+      closeFrame(ID);
+      const url = `data:text/html;charset=utf-8,${encodeURIComponent(
         Scratch.Cast.toString(HTML)
       )}`;
       if (await Scratch.canEmbed(url)) {
-        createFrame(url);
+        createFrame(url, ID);
       }
     }
 
     show() {
-      if (iframe) {
-        iframe.style.display = "";
+      const ID = "iframe";
+      const iframeData = getIframeData(ID);
+      if (iframeData.iframe) {
+        iframeData.iframe.style.display = "";
       }
     }
 
     hide() {
-      if (iframe) {
-        iframe.style.display = "none";
+      const ID = "iframe";
+      const iframeData = getIframeData(ID);
+      if (iframeData.iframe) {
+        iframeData.iframe.style.display = "none";
       }
     }
 
     close() {
-      closeFrame();
+      const ID = "iframe";
+      closeFrame(ID);
     }
 
     get({ MENU }) {
+      const ID = "iframe";
       MENU = Scratch.Cast.toString(MENU);
+      const iframeData = getIframeData(ID);
+
       if (MENU === "url") {
-        if (iframe) return iframe.getAttribute("src");
+        if (iframeData.iframe) return iframeData.iframe.getAttribute("src");
         return "";
       } else if (MENU === "visible") {
-        return !!iframe && iframe.style.display !== "none";
+        return (
+          !!iframeData.iframe && iframeData.iframe.style.display !== "none"
+        );
       } else if (MENU === "x") {
-        return x;
+        return iframeData.x;
       } else if (MENU === "y") {
-        return y;
+        return iframeData.y;
       } else if (MENU === "width") {
-        return width >= 0 ? width : Scratch.vm.runtime.stageWidth;
+        return iframeData.width >= 0
+          ? iframeData.width
+          : Scratch.vm.runtime.stageWidth;
       } else if (MENU === "height") {
-        return height >= 0 ? height : Scratch.vm.runtime.stageHeight;
+        return iframeData.height >= 0
+          ? iframeData.height
+          : Scratch.vm.runtime.stageHeight;
       } else if (MENU === "interactive") {
-        return interactive;
+        return iframeData.interactive;
       } else if (MENU === "resize behavior") {
-        return resizeBehavior;
+        return iframeData.resizeBehavior;
       } else {
         return "";
       }
     }
 
     setX({ X }) {
-      x = Scratch.Cast.toNumber(X);
-      updateFrameAttributes();
+      const ID = "iframe";
+      const iframeData = getIframeData(ID);
+      iframeData.x = Scratch.Cast.toNumber(X);
+      updateFrameAttributes(ID);
     }
 
     setY({ Y }) {
-      y = Scratch.Cast.toNumber(Y);
-      updateFrameAttributes();
+      const ID = "iframe";
+      const iframeData = getIframeData(ID);
+      iframeData.y = Scratch.Cast.toNumber(Y);
+      updateFrameAttributes(ID);
     }
 
     setWidth({ WIDTH }) {
-      width = Scratch.Cast.toNumber(WIDTH);
-      updateFrameAttributes();
+      const ID = "iframe";
+      const iframeData = getIframeData(ID);
+      iframeData.width = Scratch.Cast.toNumber(WIDTH);
+      updateFrameAttributes(ID);
     }
 
     setHeight({ HEIGHT }) {
-      height = Scratch.Cast.toNumber(HEIGHT);
-      updateFrameAttributes();
+      const ID = "iframe";
+      const iframeData = getIframeData(ID);
+      iframeData.height = Scratch.Cast.toNumber(HEIGHT);
+      updateFrameAttributes(ID);
     }
 
     setInteractive({ INTERACTIVE }) {
-      interactive = Scratch.Cast.toBoolean(INTERACTIVE);
-      updateFrameAttributes();
+      const ID = "iframe";
+      const iframeData = getIframeData(ID);
+      iframeData.interactive = Scratch.Cast.toBoolean(INTERACTIVE);
+      updateFrameAttributes(ID);
     }
 
     setResize({ RESIZE }) {
+      const ID = "iframe";
+      const iframeData = getIframeData(ID);
       if (RESIZE === "scale" || RESIZE === "viewport") {
-        resizeBehavior = RESIZE;
-        if (overlay) {
-          overlay.mode = getOverlayMode();
+        iframeData.resizeBehavior = RESIZE;
+        if (iframeData.overlay) {
+          iframeData.overlay.mode = getOverlayMode(RESIZE);
           Scratch.renderer._updateOverlays();
-          updateFrameAttributes();
+          updateFrameAttributes(ID);
         }
       }
     }
 
     sendMessage({ MESSAGE }) {
-      if (iframe && iframe.contentWindow) {
-        iframe.contentWindow.postMessage(MESSAGE, "*");
+      const ID = "iframe";
+      const iframeData = iframes[ID];
+      if (iframeData && iframeData.iframe && iframeData.iframe.contentWindow) {
+        iframeData.iframe.contentWindow.postMessage(MESSAGE, "*");
       }
     }
 
     iframeMessage() {
-      return latestMessage;
+      const ID = "iframe";
+      const iframeData = getIframeData(ID);
+      return iframeData.latestMessage;
+    }
+
+    // 古いブロックの実装 (複数iframe対応)
+    async display_new({ URL, ID }) {
+      ID = Scratch.Cast.toString(ID);
+      if (!ID) ID = "iframe";
+      closeFrame(ID);
+      if (await Scratch.canEmbed(URL)) {
+        createFrame(Scratch.Cast.toString(URL), ID);
+      }
+    }
+
+    async displayHTML_new({ HTML, ID }) {
+      ID = Scratch.Cast.toString(ID);
+      if (!ID) ID = "iframe";
+      closeFrame(ID);
+      const url = `data:text/html;,${encodeURIComponent(
+        Scratch.Cast.toString(HTML)
+      )}`;
+      if (await Scratch.canEmbed(url)) {
+        createFrame(url, ID);
+      }
+    }
+
+    show_new({ ID }) {
+      ID = Scratch.Cast.toString(ID);
+      if (!ID) ID = "iframe";
+      const iframeData = getIframeData(ID);
+      if (iframeData.iframe) {
+        iframeData.iframe.style.display = "";
+      }
+    }
+
+    hide_new({ ID }) {
+      ID = Scratch.Cast.toString(ID);
+      if (!ID) ID = "iframe";
+      const iframeData = getIframeData(ID);
+      if (iframeData.iframe) {
+        iframeData.iframe.style.display = "none";
+      }
+    }
+
+    close_new({ ID }) {
+      ID = Scratch.Cast.toString(ID);
+      if (!ID) ID = "iframe";
+      closeFrame(ID);
+    }
+
+    get_new({ ID, MENU }) {
+      ID = Scratch.Cast.toString(ID);
+      if (!ID) ID = "iframe";
+      MENU = Scratch.Cast.toString(MENU);
+      const iframeData = getIframeData(ID);
+
+      if (MENU === "url") {
+        if (iframeData.iframe) return iframeData.iframe.getAttribute("src");
+        return "";
+      } else if (MENU === "visible") {
+        return (
+          !!iframeData.iframe && iframeData.iframe.style.display !== "none"
+        );
+      } else if (MENU === "x") {
+        return iframeData.x;
+      } else if (MENU === "y") {
+        return iframeData.y;
+      } else if (MENU === "width") {
+        return iframeData.width >= 0
+          ? iframeData.width
+          : Scratch.vm.runtime.stageWidth;
+      } else if (MENU === "height") {
+        return iframeData.height >= 0
+          ? iframeData.height
+          : Scratch.vm.runtime.stageHeight;
+      } else if (MENU === "interactive") {
+        return iframeData.interactive;
+      } else if (MENU === "resize behavior") {
+        return iframeData.resizeBehavior;
+      } else {
+        return "";
+      }
+    }
+
+    setX_new({ ID, X }) {
+      ID = Scratch.Cast.toString(ID);
+      if (!ID) ID = "iframe";
+      const iframeData = getIframeData(ID);
+      iframeData.x = Scratch.Cast.toNumber(X);
+      updateFrameAttributes(ID);
+    }
+
+    setY_new({ ID, Y }) {
+      ID = Scratch.Cast.toString(ID);
+      if (!ID) ID = "iframe";
+      const iframeData = getIframeData(ID);
+      iframeData.y = Scratch.Cast.toNumber(Y);
+      updateFrameAttributes(ID);
+    }
+
+    setWidth_new({ ID, WIDTH }) {
+      ID = Scratch.Cast.toString(ID);
+      if (!ID) ID = "iframe";
+      const iframeData = getIframeData(ID);
+      iframeData.width = Scratch.Cast.toNumber(WIDTH);
+      updateFrameAttributes(ID);
+    }
+
+    setHeight_new({ ID, HEIGHT }) {
+      ID = Scratch.Cast.toString(ID);
+      if (!ID) ID = "iframe";
+      const iframeData = getIframeData(ID);
+      iframeData.height = Scratch.Cast.toNumber(HEIGHT);
+      updateFrameAttributes(ID);
+    }
+
+    setInteractive_new({ ID, INTERACTIVE }) {
+      ID = Scratch.Cast.toString(ID);
+      if (!ID) ID = "iframe";
+      const iframeData = getIframeData(ID);
+      iframeData.interactive = Scratch.Cast.toBoolean(INTERACTIVE);
+      updateFrameAttributes(ID);
+    }
+
+    setResize_new({ ID, RESIZE }) {
+      ID = Scratch.Cast.toString(ID);
+      if (!ID) ID = "iframe";
+      const iframeData = getIframeData(ID);
+      if (RESIZE === "scale" || RESIZE === "viewport") {
+        iframeData.resizeBehavior = RESIZE;
+        if (iframeData.overlay) {
+          iframeData.overlay.mode = getOverlayMode(RESIZE);
+          Scratch.renderer._updateOverlays();
+          updateFrameAttributes(ID);
+        }
+      }
+    }
+
+    sendMessage_new({ ID, MESSAGE }) {
+      ID = Scratch.Cast.toString(ID);
+      if (!ID) ID = "iframe";
+      const iframeData = iframes[ID];
+      if (iframeData && iframeData.iframe && iframeData.iframe.contentWindow) {
+        iframeData.iframe.contentWindow.postMessage(MESSAGE, "*");
+      }
+    }
+
+    iframeMessage_new({ ID }) {
+      ID = Scratch.Cast.toString(ID);
+      if (!ID) ID = "iframe";
+      const iframeData = getIframeData(ID);
+      return iframeData.latestMessage;
+    }
+
+    lastMessageId_new() {
+      // 最後にメッセージを受信したiframeのIDを返す
+      for (const id in iframes) {
+        if (iframes[id].latestMessage !== "") {
+          return id;
+        }
+      }
+      return "iframe";
     }
   }