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During game play in test mode, press [F9]. No clipping mode: During game play in test mode, hold [Alt] to go through walls. Skip messages: During game play in test mode, hold [Shift]. Display frame rate: During game play in test mode, hold [F2] to display the frame rate in the title bar. Hidden options: Press [F1] during game play to display a menu with options for smoother game play, toggling the background music or sounds, and changing the keyboard settings.  
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