Slow down your ship completely, and press F1 for fixed sights.
 Press BACKSPACE to pause the game and type 'js arg s'.
 You should now be invincible, and your fuel and shields will never
 deplete. Press 'P' for more missles.
 
 To enter the secret object viewer, press 'z'.  Then press 'p' to
 pause. Select [, and .] and manipulate objects.  You can use all keys
 but 'q' and 'ESC'.  Use the mouse to change point of view, or
 magnification with right mouse button.
 
 Type SGLIDER AND MAKE IT SNAPPY to have the following keys available:
 
 F1: Skip Levels
 F2: Restore Energy
 F3: Restore fuel
 F4: Add missiles