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diff --git a/engines/lab/interface.h b/engines/lab/interface.h
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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * 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 (at your option) 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+/*
+ * This code is based on Labyrinth of Time code with assistance of
+ *
+ * Copyright (c) 1993 Terra Nova Development
+ * Copyright (c) 2004 The Wyrmkeep Entertainment Co.
+ *
+ */
+
+#ifndef LAB_INTERFACE_H
+#define LAB_INTERFACE_H
+
+#include "common/events.h"
+
+namespace Lab {
+
+class LabEngine;
+class Image;
+
+struct Button {
+	uint16 _x, _y, _buttonId;
+	Common::KeyCode _keyEquiv; // the key which activates this button
+	bool _isEnabled;
+	Image *_image, *_altImage;
+};
+
+typedef Common::List<Button *> ButtonList;
+
+class Interface {
+private:
+	LabEngine *_vm;
+
+	Button *_hitButton;
+	ButtonList *_screenButtonList;
+
+public:
+	Interface(LabEngine *vm);
+
+	void attachButtonList(ButtonList *buttonList);
+	Button *createButton(uint16 x, uint16 y, uint16 id, Common::KeyCode key, Image *image, Image *altImage);
+	void toggleButton(Button *button, uint16 penColor, bool enable);
+
+	/**
+	 * Draws a button list to the screen.
+	 */
+	void drawButtonList(ButtonList *buttonList);
+	void freeButtonList(ButtonList *buttonList);
+	Button *getButton(uint16 id);
+
+	/**
+	* Checks whether or not the coords fall within one of the buttons in a list
+	* of buttons.
+	*/
+	Button *checkButtonHit(Common::Point pos);
+
+	/**
+	* Checks whether or not the coords fall within one of the buttons in a list
+	* of buttons.
+	*/
+	Button *checkNumButtonHit(Common::KeyCode key);
+
+	void handlePressedButton();
+
+	void mayShowCrumbIndicator();
+	void mayShowCrumbIndicatorOff();
+};
+
+} // End of namespace Lab
+
+#endif // LAB_INTERFACE_H