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diff --git a/src/gui/windows/didyouknowwindow.h b/src/gui/windows/didyouknowwindow.h
new file mode 100644
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+++ b/src/gui/windows/didyouknowwindow.h
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+/*
+ *  The ManaPlus Client
+ *  Copyright (C) 2004-2009  The Mana World Development Team
+ *  Copyright (C) 2009-2010  The Mana Developers
+ *  Copyright (C) 2011-2013  The ManaPlus Developers
+ *
+ *  This file is part of The ManaPlus Client.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef GUI_DIDYOUKNOWWINDOW_H
+#define GUI_DIDYOUKNOWWINDOW_H
+
+#include "gui/widgets/linkhandler.h"
+#include "gui/widgets/window.h"
+
+#include <guichan/actionlistener.hpp>
+
+class Button;
+class BrowserBox;
+class CheckBox;
+class ScrollArea;
+
+/**
+ * The help dialog.
+ */
+class DidYouKnowWindow final : public Window,
+                               public LinkHandler,
+                               public gcn::ActionListener
+{
+    public:
+        /**
+         * Constructor.
+         */
+        DidYouKnowWindow();
+
+        A_DELETE_COPY(DidYouKnowWindow)
+
+        /**
+         * Called when receiving actions from the widgets.
+         */
+        void action(const gcn::ActionEvent &event) override;
+
+        /**
+         * Handles link action.
+         */
+        void handleLink(const std::string &link,
+                        gcn::MouseEvent *event) override;
+
+        void loadData(int num = 0);
+
+        void setVisible(bool visible);
+
+    private:
+        void loadFile(const int num);
+
+        BrowserBox *mBrowserBox;
+        ScrollArea *mScrollArea;
+        Button *mButtonPrev;
+        Button *mButtonNext;
+        CheckBox *mOpenAgainCheckBox;
+};
+
+extern DidYouKnowWindow *didYouKnowWindow;
+
+#endif  // GUI_DIDYOUKNOWWINDOW_H