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                     Prototype Differences 
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                     The buggy is closer to the final version but
                        still a little different looking 
                       
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                  The color of the title screen is
                      slightly different.  The blue is darker and the text
                      is all the same light blue color.  The final version
                      has a light green for the Player and Course text 
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                  | The mountain background colors are
                      different.  The top layer has blue mountains with
                      orange highlights and the second layer is green.  The
                      final has a darker blue for the mountains with light blue
                      highlights while the second layer is light brown  | 
                
                
                  | The rocks and ground are a lighter brown  | 
                
                
                  The HUD display colors are
                      different.  The light blue text tends to blend in
                      with the darker blue background.  The progress bar is
                      light blue with red dividers and the extra life icon is
                      also red. The final has a lighter blue/purple color for
                      the text and the progress bar is green with orange/brown
                      dividers.  The extra life counter is also
                      orange/brown. 
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                  | The flying enemy graphics have different
                      colors.  The UFOs are light tan instead of brown | 
                
                
                  | Enemy bombs are red instead of yellow | 
                
                
                  | The flying saucer graphics are completely
                      different  | 
                
                
                  | The tanks are green  | 
                
                
                  The missile (from the Championship Course) has red flames instead of yellow.  
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                  | The bomber UFO does not glow | 
                
                
                  | The city background is different
                      looking with an odd black outline  | 
                
                
                  | The buggy is red on the Beginner
                      Course and blue on the Championship Course.  This is
                      reversed in the final version  | 
                
                
                  Your bullet explosions are black and
                      do not glow 
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                  | The course letters do not
                      glow  | 
                
                
                  | Sometimes your shots go through
                      enemies  | 
                
                
                  | The continue feature is slightly
                      different.  Instead of just pressing the number 2 to
                      continue there is a counter that counts down and the
                      player must press start before it reaches 0.  | 
                
                
                  | The enemy placement is different  | 
                
                
                  | The warning indicator lights are red | 
                
                
                  The bottom warning indicator is always lit 
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