diff --git a/HMCL/src/main/java/org/jackhuang/hmcl/ui/account/FirstRunAccountDialog.java b/HMCL/src/main/java/org/jackhuang/hmcl/ui/account/FirstRunAccountDialog.java
new file mode 100644
index 0000000000..700f371ac6
--- /dev/null
+++ b/HMCL/src/main/java/org/jackhuang/hmcl/ui/account/FirstRunAccountDialog.java
@@ -0,0 +1,92 @@
+// SPDX-FileCopyrightText: Copyright (C) 2026 The HMCL Authors
+// SPDX-License-Identifier: GPL-3.0-or-later WITH AdditionRef-HMCL
+package org.jackhuang.hmcl.ui.account;
+
+import com.jfoenix.controls.JFXButton;
+import com.jfoenix.controls.JFXDialogLayout;
+import com.jfoenix.controls.JFXTextField;
+import javafx.scene.control.Label;
+import javafx.scene.layout.VBox;
+import org.jackhuang.hmcl.auth.offline.OfflineAccountFactory;
+import org.jackhuang.hmcl.setting.Accounts;
+import org.jackhuang.hmcl.task.Schedulers;
+import org.jackhuang.hmcl.task.Task;
+import org.jackhuang.hmcl.ui.Controllers;
+import org.jackhuang.hmcl.ui.construct.DialogAware;
+import org.jackhuang.hmcl.ui.construct.DialogCloseEvent;
+import org.jetbrains.annotations.NotNullByDefault;
+
+import java.util.regex.Pattern;
+
+import static org.jackhuang.hmcl.util.i18n.I18n.i18n;
+
+/// A small dialog shown when the player has no account yet.
+///
+/// The player either types a game name, which creates an offline account, or chooses to sign in
+/// with a Microsoft account instead. Authentication itself is left to the server.
+@NotNullByDefault
+public final class FirstRunAccountDialog extends JFXDialogLayout implements DialogAware {
+    /// Names accepted by the game: letters, digits and underscores, at most 16 characters.
+    private static final Pattern NAME_PATTERN = Pattern.compile("^[A-Za-z0-9_]{1,16}$");
+
+    private final JFXTextField nameField = new JFXTextField();
+    private final Label hint = new Label();
+    private final JFXButton acceptButton = new JFXButton(i18n("first_run.accept"));
+
+    /// Creates the dialog with its name field and the two actions.
+    public FirstRunAccountDialog() {
+        Label heading = new Label(i18n("first_run.title"));
+        setHeading(heading);
+
+        Label description = new Label(i18n("first_run.description"));
+        description.setWrapText(true);
+        nameField.setPromptText(i18n("first_run.name"));
+        hint.setStyle("-fx-text-fill: -monet-error;");
+        hint.setWrapText(true);
+        VBox body = new VBox(13, description, nameField, hint);
+        body.setPrefWidth(377);
+        setBody(body);
+
+        JFXButton microsoftButton = new JFXButton(i18n("first_run.microsoft"));
+        microsoftButton.getStyleClass().add("dialog-cancel");
+        microsoftButton.setOnAction(e -> {
+            fireEvent(new DialogCloseEvent());
+            Controllers.dialog(new CreateAccountPane(Accounts.FACTORY_MICROSOFT));
+        });
+
+        acceptButton.getStyleClass().add("dialog-accept");
+        acceptButton.setOnAction(e -> createAccount());
+        nameField.setOnAction(e -> acceptButton.fire());
+        setActions(microsoftButton, acceptButton);
+    }
+
+    /// Validates the typed name and creates and selects the offline account.
+    private void createAccount() {
+        String name = nameField.getText() == null ? "" : nameField.getText().trim();
+        if (!NAME_PATTERN.matcher(name).matches()) {
+            hint.setText(i18n("first_run.invalid"));
+            return;
+        }
+
+        hint.setText("");
+        acceptButton.setDisable(true);
+        Task.supplyAsync(() -> Accounts.FACTORY_OFFLINE.create(
+                        new CreateAccountPane.DialogCharacterSelector(), name, null, null,
+                        new OfflineAccountFactory.AdditionalData(null, null)))
+                .whenComplete(Schedulers.javafx(), account -> {
+                    if (!Accounts.getAccounts().contains(account)) {
+                        Accounts.getAccounts().add(account);
+                    }
+                    Accounts.setSelectedAccount(account);
+                    fireEvent(new DialogCloseEvent());
+                }, exception -> {
+                    acceptButton.setDisable(false);
+                    hint.setText(Accounts.localizeErrorMessage(exception));
+                }).start();
+    }
+
+    @Override
+    public void onDialogShown() {
+        nameField.requestFocus();
+    }
+}
diff --git a/HMCL/src/main/java/org/jackhuang/hmcl/ui/instances/Instances.java b/HMCL/src/main/java/org/jackhuang/hmcl/ui/instances/Instances.java
index 95b3aeb5ea..82f5c21e1d 100644
--- a/HMCL/src/main/java/org/jackhuang/hmcl/ui/instances/Instances.java
+++ b/HMCL/src/main/java/org/jackhuang/hmcl/ui/instances/Instances.java
@@ -18,6 +18,7 @@ import org.jackhuang.hmcl.task.Task;
 import org.jackhuang.hmcl.ui.Controllers;
 import org.jackhuang.hmcl.ui.FXUtils;
 import org.jackhuang.hmcl.ui.account.CreateAccountPane;
+import org.jackhuang.hmcl.ui.account.FirstRunAccountDialog;
 import org.jackhuang.hmcl.ui.construct.DialogCloseEvent;
 import org.jackhuang.hmcl.ui.construct.MessageDialogPane;
 import org.jackhuang.hmcl.ui.construct.PromptDialogPane;
@@ -363,7 +364,7 @@ public final class Instances {
     private static void ensureSelectedAccount(Consumer<Account> action) {
         Account account = Accounts.getSelectedAccount();
         if (account == null) {
-            CreateAccountPane dialog = new CreateAccountPane();
+            FirstRunAccountDialog dialog = new FirstRunAccountDialog();
             dialog.addEventHandler(DialogCloseEvent.CLOSE, e -> {
                 Account newAccount = Accounts.getSelectedAccount();
                 if (newAccount == null) {
diff --git a/HMCL/src/main/resources/assets/lang/I18N.properties b/HMCL/src/main/resources/assets/lang/I18N.properties
index 394aefad29..df25926b4c 100644
--- a/HMCL/src/main/resources/assets/lang/I18N.properties
+++ b/HMCL/src/main/resources/assets/lang/I18N.properties
@@ -800,6 +800,12 @@ home.not_installed=Not installed
 launcher.name=Server Launcher
 account.add=Add account
 account.open_manage=Manage accounts
+first_run.title=Pick a game name
+first_run.description=Your name is used when you join the server. You can sign in with a Microsoft account instead.
+first_run.name=Game name
+first_run.accept=Start playing
+first_run.microsoft=Sign in with Microsoft
+first_run.invalid=Use 1 to 16 letters, digits or underscores.
 server.join=Join Server
 instance.launch_and_enter_world=Play World
 instance.launch.empty=Start Game
diff --git a/HMCL/src/main/resources/assets/lang/I18N_lzh.properties b/HMCL/src/main/resources/assets/lang/I18N_lzh.properties
index 1183659a44..e3f0351091 100644
--- a/HMCL/src/main/resources/assets/lang/I18N_lzh.properties
+++ b/HMCL/src/main/resources/assets/lang/I18N_lzh.properties
@@ -620,6 +620,12 @@ home.not_installed=未裝
 launcher.name=服啟
 account.add=增帳
 account.open_manage=理帳
+first_run.title=署名
+first_run.description=入服用此名。可改登微軟之帳。
+first_run.name=名
+first_run.accept=始
+first_run.microsoft=登正版
+first_run.invalid=一至十六字，限英文數字底線。
 server.join=入服
 # instance.launch_and_enter_world=
 instance.launch.empty=啟戲
diff --git a/HMCL/src/main/resources/assets/lang/I18N_zh_Hans.properties b/HMCL/src/main/resources/assets/lang/I18N_zh_Hans.properties
index 741c830f17..bc10bf1a87 100644
--- a/HMCL/src/main/resources/assets/lang/I18N_zh_Hans.properties
+++ b/HMCL/src/main/resources/assets/lang/I18N_zh_Hans.properties
@@ -623,6 +623,12 @@ home.not_installed=尚未安装
 launcher.name=服务器启动器
 account.add=添加账号
 account.open_manage=管理账号
+first_run.title=起个游戏名
+first_run.description=进服时会用这个名字。想用正版账号的话，可以改为登录微软账号。
+first_run.name=游戏名
+first_run.accept=开始游戏
+first_run.microsoft=登录正版账号
+first_run.invalid=只能用 1 到 16 个英文字母、数字或下划线。
 server.join=进入服务器
 instance.launch_and_enter_world=进入世界
 instance.launch.empty=开始游戏
diff --git a/HMCL/src/main/resources/assets/lang/I18N_zh_Hant.properties b/HMCL/src/main/resources/assets/lang/I18N_zh_Hant.properties
index e1f50043cd..060a6f6c52 100644
--- a/HMCL/src/main/resources/assets/lang/I18N_zh_Hant.properties
+++ b/HMCL/src/main/resources/assets/lang/I18N_zh_Hant.properties
@@ -617,6 +617,12 @@ home.not_installed=尚未安裝
 launcher.name=伺服器啟動器
 account.add=新增帳號
 account.open_manage=管理帳號
+first_run.title=取個遊戲名
+first_run.description=進服時會使用這個名字。想用正版帳號的話，可以改為登入微軟帳號。
+first_run.name=遊戲名
+first_run.accept=開始遊戲
+first_run.microsoft=登入正版帳號
+first_run.invalid=只能使用 1 到 16 個英文字母、數字或底線。
 server.join=進入伺服器
 instance.launch_and_enter_world=進入世界
 instance.launch.empty=開始遊戲