diff --git a/docs/PORT-PLAN.md b/docs/PORT-PLAN.md
index 3235098c..1806396c 100644
--- a/docs/PORT-PLAN.md
+++ b/docs/PORT-PLAN.md
@@ -117,7 +117,8 @@ PORT 扩展（40250 没有对应物，只为移动端/平台而加；不能改 4
 
 - 由 `PythonBoot::RunMainScript` 注入的 Python 模块：`mt_autohunt`（自动狩猎，`AutoHuntScript.inc`）、`mt_register`
   （客户端内账号注册）、`mt_framerate`（系统选项里的"画面帧率"行）、`mt_uiscale`（系统选项里的"界面大小"行）、`mt_inventory`（5 页背包：改写 `InventoryWindow.py` 的装备格起点和页签，
-  泛化翻页、自动药水高亮和选宝石窗口的格子扫描）。它们包装 40250 窗口类的方法，不修改脚本文件。
+  泛化翻页、自动药水高亮和选宝石窗口的格子扫描）、`mt_mallhint`（系统菜单"商城"按钮和服务端 `mall` 命令改为
+  提示去各村杂货店旁的 NPC 9010 百店老板娘购买，见 `tools/server/item-mall-shop/`；203 没有网页商城）。它们包装 40250 窗口类的方法，不修改脚本文件。
 - 界面大小（`platform/EterBase/UIScaleMode.h` + `src/host/ui_scale.cpp`）：Android 上 40250 界面按 600 / 700 / 800
   逻辑像素高排版（默认 600，最低就是 600：背包窗口 565 高），宽度随屏幕比例；选择存在 `ui_height.cfg`，下次启动生效。
   桌面按窗口大小排版，`MT_UI_HEIGHT=600` 可在桌面上测试这一设置。
diff --git a/src/platform/ScriptLib/MallHintScript.inc b/src/platform/ScriptLib/MallHintScript.inc
new file mode 100644
index 00000000..f8d27f47
--- /dev/null
+++ b/src/platform/ScriptLib/MallHintScript.inc
@@ -0,0 +1,44 @@
+// The system menu's 商城 button (PORT), run by PythonBoot::RunMainScript as module mt_mallhint. In 40250 it
+// sends /in_game_mall and the server answers `mall <url>`, which game.GameWindow opens in the web window;
+// 203 has no web shop and the port has no web view, so the window stayed empty. The mall items are sold by
+// NPC 9010 百店老板娘 next to each village's general store instead (tools/server/item-mall-shop), so the
+// button, and a `mall` command from the server, show where to find her. Both are replaced on the classes
+// before the system dialog and the game window are created, which bind them.
+// Strings are UTF-8 here and go through player.AutoHuntLocalize into the locale's code page.
+static const char c_szMallHintScript[] = R"PY(# -*- coding: utf-8 -*-
+import chat
+import game
+import player
+import uiCommon
+import uiSystem
+
+L = player.AutoHuntLocalize
+
+HINT = "商城物品请到各村杂货店旁的百店老板娘处购买"
+POPUP_WIDTH = 330
+
+_popup = []
+
+
+def _ShowHint():
+	chat.AppendChat(chat.CHAT_TYPE_INFO, L(HINT))
+	if not _popup:
+		popup = uiCommon.PopupDialog()
+		popup.SetWidth(POPUP_WIDTH)
+		popup.SetText(L(HINT))
+		_popup.append(popup)
+	_popup[0].Open()
+
+
+def _ClickInGameShopButton(self):
+	self.Close()
+	_ShowHint()
+
+
+def _InGameShop_Show(self, url):
+	_ShowHint()
+
+
+uiSystem.SystemDialog._SystemDialog__ClickInGameShopButton = _ClickInGameShopButton
+game.GameWindow._GameWindow__InGameShop_Show = _InGameShop_Show
+)PY";
diff --git a/src/platform/ScriptLib/PythonBoot.cpp b/src/platform/ScriptLib/PythonBoot.cpp
index 16a70b2f..9bd8576a 100644
--- a/src/platform/ScriptLib/PythonBoot.cpp
+++ b/src/platform/ScriptLib/PythonBoot.cpp
@@ -879,6 +879,7 @@ namespace PythonBoot
 #include "FrameRateOptionScript.inc"
 #include "UIScaleOptionScript.inc"
 #include "InventoryPagesScript.inc"
+#include "MallHintScript.inc"
 
 static void install_script_module(const char* c_szModule, const char* c_szScript)
 {
@@ -937,6 +938,7 @@ bool RunMainScript(const char* lpCmdLine, std::string* error)
 		install_script_module("mt_framerate", c_szFrameRateOptionScript);
 		install_script_module("mt_uiscale", c_szUIScaleOptionScript);
 		install_script_module("mt_inventory", c_szInventoryPagesScript);
+		install_script_module("mt_mallhint", c_szMallHintScript);
 	}
 	return true;
 }