diff --git a/Userland/Games/Minesweeper/CMakeLists.txt b/Userland/Games/Minesweeper/CMakeLists.txt
index ad304f0b76..665903d122 100644
--- a/Userland/Games/Minesweeper/CMakeLists.txt
+++ b/Userland/Games/Minesweeper/CMakeLists.txt
@@ -4,18 +4,15 @@ serenity_component(
     TARGETS Minesweeper
 )
 
-stringify_gml(MinesweeperCustomGameWindow.gml MinesweeperCustomGameWindowGML.h minesweeper_custom_game_window_gml)
-stringify_gml(MinesweeperWindow.gml MinesweeperWindowGML.h minesweeper_window_gml)
+compile_gml(MainWidget.gml MainWidgetGML.cpp)
+compile_gml(CustomGameWidget.gml CustomGameWidgetGML.cpp)
 
 set(SOURCES
     CustomGameDialog.cpp
+    CustomGameWidgetGML.cpp
     Field.cpp
     main.cpp
-)
-
-set(GENERATED_SOURCES
-    MinesweeperCustomGameWindowGML.h
-    MinesweeperWindowGML.h
+    MainWidgetGML.cpp
 )
 
 serenity_app(Minesweeper ICON app-minesweeper)
diff --git a/Userland/Games/Minesweeper/CustomGameDialog.cpp b/Userland/Games/Minesweeper/CustomGameDialog.cpp
index c262ebfc03..7363b8412b 100644
--- a/Userland/Games/Minesweeper/CustomGameDialog.cpp
+++ b/Userland/Games/Minesweeper/CustomGameDialog.cpp
@@ -7,11 +7,26 @@
 
 #include "CustomGameDialog.h"
 #include "Field.h"
-#include <Games/Minesweeper/MinesweeperCustomGameWindowGML.h>
+
+namespace Minesweeper {
+
+ErrorOr<NonnullRefPtr<CustomGameDialog>> CustomGameDialog::try_create(GUI::Window* parent)
+{
+    auto settings_widget = TRY(CustomGameWidget::try_create());
+    auto settings_dialog = TRY(adopt_nonnull_ref_or_enomem(new (nothrow)
+            CustomGameDialog(move(settings_widget), move(parent))));
+    return settings_dialog;
+}
 
 GUI::Dialog::ExecResult CustomGameDialog::show(GUI::Window* parent_window, Field& field)
 {
-    auto dialog = CustomGameDialog::construct(parent_window);
+    auto dialog_or_error = CustomGameDialog::try_create(parent_window);
+    if (dialog_or_error.is_error()) {
+        GUI::MessageBox::show(parent_window, "Couldn't load custom game dialog"sv, "Error while opening custom game dialog"sv, GUI::MessageBox::Type::Error);
+        return ExecResult::Aborted;
+    }
+
+    auto dialog = dialog_or_error.release_value();
 
     if (parent_window) {
         dialog->set_icon(parent_window->icon());
@@ -38,21 +53,20 @@ void CustomGameDialog::set_max_mines()
     m_mines_spinbox->set_max((m_rows_spinbox->value() * m_columns_spinbox->value()) - 9);
 }
 
-CustomGameDialog::CustomGameDialog(Window* parent_window)
+CustomGameDialog::CustomGameDialog(NonnullRefPtr<CustomGameWidget> custom_game_widget, GUI::Window* parent_window)
     : Dialog(parent_window)
 {
     resize(300, 82);
     set_resizable(false);
     set_title("Custom Game");
 
-    auto main_widget = set_main_widget<GUI::Widget>();
-    main_widget->load_from_gml(minesweeper_custom_game_window_gml).release_value_but_fixme_should_propagate_errors();
+    set_main_widget(custom_game_widget);
 
-    m_columns_spinbox = *main_widget->find_descendant_of_type_named<GUI::SpinBox>("columns_spinbox");
-    m_rows_spinbox = *main_widget->find_descendant_of_type_named<GUI::SpinBox>("rows_spinbox");
-    m_mines_spinbox = *main_widget->find_descendant_of_type_named<GUI::SpinBox>("mines_spinbox");
-    m_ok_button = *main_widget->find_descendant_of_type_named<GUI::Button>("ok_button");
-    m_cancel_button = *main_widget->find_descendant_of_type_named<GUI::Button>("cancel_button");
+    m_columns_spinbox = *custom_game_widget->find_descendant_of_type_named<GUI::SpinBox>("columns_spinbox");
+    m_rows_spinbox = *custom_game_widget->find_descendant_of_type_named<GUI::SpinBox>("rows_spinbox");
+    m_mines_spinbox = *custom_game_widget->find_descendant_of_type_named<GUI::SpinBox>("mines_spinbox");
+    m_ok_button = *custom_game_widget->find_descendant_of_type_named<GUI::Button>("ok_button");
+    m_cancel_button = *custom_game_widget->find_descendant_of_type_named<GUI::Button>("cancel_button");
 
     m_columns_spinbox->on_change = [this](auto) {
         set_max_mines();
@@ -72,3 +86,5 @@ CustomGameDialog::CustomGameDialog(Window* parent_window)
 
     set_max_mines();
 }
+
+}
diff --git a/Userland/Games/Minesweeper/CustomGameDialog.h b/Userland/Games/Minesweeper/CustomGameDialog.h
index 42dd35625a..f88183f658 100644
--- a/Userland/Games/Minesweeper/CustomGameDialog.h
+++ b/Userland/Games/Minesweeper/CustomGameDialog.h
@@ -7,20 +7,25 @@
 
 #pragma once
 
+#include "CustomGameWidget.h"
 #include <LibGUI/Button.h>
 #include <LibGUI/Dialog.h>
+#include <LibGUI/MessageBox.h>
 #include <LibGUI/SpinBox.h>
 
 class Field;
 
+namespace Minesweeper {
+
 class CustomGameDialog : public GUI::Dialog {
-    C_OBJECT(CustomGameDialog);
+    C_OBJECT_ABSTRACT(CustomGameDialog);
 
 public:
     static ExecResult show(GUI::Window* parent_window, Field& field);
+    static ErrorOr<NonnullRefPtr<CustomGameDialog>> try_create(GUI::Window* parent);
 
 private:
-    CustomGameDialog(GUI::Window* parent_window);
+    CustomGameDialog(NonnullRefPtr<CustomGameWidget> custom_game_widget, GUI::Window* parent_window);
     virtual ~CustomGameDialog() override = default;
 
     void set_max_mines();
@@ -31,3 +36,5 @@ private:
     RefPtr<GUI::SpinBox> m_rows_spinbox;
     RefPtr<GUI::SpinBox> m_mines_spinbox;
 };
+
+}
diff --git a/Userland/Games/Minesweeper/MinesweeperCustomGameWindow.gml b/Userland/Games/Minesweeper/CustomGameWidget.gml
similarity index 97%
rename from Userland/Games/Minesweeper/MinesweeperCustomGameWindow.gml
rename to Userland/Games/Minesweeper/CustomGameWidget.gml
index 9230be05f9..857b81c152 100644
--- a/Userland/Games/Minesweeper/MinesweeperCustomGameWindow.gml
+++ b/Userland/Games/Minesweeper/CustomGameWidget.gml
@@ -1,4 +1,4 @@
-@GUI::Widget {
+@Minesweeper::CustomGameWidget {
     fill_with_background_color: true
     layout: @GUI::VerticalBoxLayout {
         margins: [4]
@@ -7,7 +7,6 @@
 
     @GUI::GroupBox {
         title: "Field"
-        autosize: true
         layout: @GUI::HorizontalBoxLayout {
             margins: [6]
         }
diff --git a/Userland/Games/Minesweeper/CustomGameWidget.h b/Userland/Games/Minesweeper/CustomGameWidget.h
new file mode 100644
index 0000000000..09850caa3e
--- /dev/null
+++ b/Userland/Games/Minesweeper/CustomGameWidget.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2023, the SerenityOS developers
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibGUI/Widget.h>
+
+namespace Minesweeper {
+
+class CustomGameWidget : public GUI::Widget {
+    C_OBJECT_ABSTRACT(CustomGameWidget)
+public:
+    static ErrorOr<NonnullRefPtr<CustomGameWidget>> try_create();
+    virtual ~CustomGameWidget() override = default;
+
+private:
+    CustomGameWidget() = default;
+};
+
+}
diff --git a/Userland/Games/Minesweeper/MinesweeperWindow.gml b/Userland/Games/Minesweeper/MainWidget.gml
similarity index 97%
rename from Userland/Games/Minesweeper/MinesweeperWindow.gml
rename to Userland/Games/Minesweeper/MainWidget.gml
index 2bb4d39e82..4163954892 100644
--- a/Userland/Games/Minesweeper/MinesweeperWindow.gml
+++ b/Userland/Games/Minesweeper/MainWidget.gml
@@ -1,4 +1,4 @@
-@GUI::Widget {
+@Minesweeper::MainWidget {
     fill_with_background_color: true
     layout: @GUI::VerticalBoxLayout {
         spacing: 0
diff --git a/Userland/Games/Minesweeper/MainWidget.h b/Userland/Games/Minesweeper/MainWidget.h
new file mode 100644
index 0000000000..26216e1868
--- /dev/null
+++ b/Userland/Games/Minesweeper/MainWidget.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (c) 2023, the SerenityOS developers
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+#include <LibGUI/Widget.h>
+
+namespace Minesweeper {
+
+class MainWidget : public GUI::Widget {
+    C_OBJECT_ABSTRACT(MainWidget)
+public:
+    static ErrorOr<NonnullRefPtr<Minesweeper::MainWidget>> try_create();
+    virtual ~MainWidget() override = default;
+
+private:
+    MainWidget() = default;
+};
+
+}
diff --git a/Userland/Games/Minesweeper/main.cpp b/Userland/Games/Minesweeper/main.cpp
index 38eeeb32ac..d9e9492397 100644
--- a/Userland/Games/Minesweeper/main.cpp
+++ b/Userland/Games/Minesweeper/main.cpp
@@ -6,8 +6,8 @@
 
 #include "CustomGameDialog.h"
 #include "Field.h"
+#include "MainWidget.h"
 #include <AK/URL.h>
-#include <Games/Minesweeper/MinesweeperWindowGML.h>
 #include <LibConfig/Client.h>
 #include <LibCore/System.h>
 #include <LibDesktop/Launcher.h>
@@ -49,14 +49,14 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
     window->set_title("Minesweeper");
     window->set_auto_shrink(true);
 
-    auto widget = window->set_main_widget<GUI::Widget>();
-    TRY(widget->load_from_gml(minesweeper_window_gml));
+    auto main_widget = TRY(Minesweeper::MainWidget::try_create());
+    window->set_main_widget(main_widget);
 
-    auto& flag_label = *widget->find_descendant_of_type_named<GUI::Label>("flag_label");
-    auto& time_label = *widget->find_descendant_of_type_named<GUI::Label>("time_label");
-    auto& face_button = *widget->find_descendant_of_type_named<GUI::Button>("face_button");
+    auto& flag_label = *main_widget->find_descendant_of_type_named<GUI::Label>("flag_label");
+    auto& time_label = *main_widget->find_descendant_of_type_named<GUI::Label>("time_label");
+    auto& face_button = *main_widget->find_descendant_of_type_named<GUI::Button>("face_button");
     auto field = TRY(Field::create(flag_label, time_label, face_button));
-    TRY(widget->try_add_child(field));
+    TRY(main_widget->try_add_child(field));
 
     auto game_menu = window->add_menu("&Game"_string);
 
@@ -112,7 +112,7 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
 
     difficulty_menu->add_separator();
     action = GUI::Action::create_checkable("&Custom Game...", { Mod_Ctrl, Key_C }, [&](auto&) {
-        CustomGameDialog::show(window, field);
+        Minesweeper::CustomGameDialog::show(window, field);
     });
     action->set_checked(field->difficulty() == Field::Difficulty::Custom);
     difficulty_menu->add_action(action);