Secret alternative third areas 
     While  playing a "Target Shooting" level, keep on the lookout for
scarecrows.  Once  one  is  found,  shoot the torso of the scarecrow 8
times.  The  head  will  inflate,  allowing  you  to shoot it for 1000
points.  Do  this with the two scarecrows in the level (the second one
will  only  appear if the first has already been shot), and instead of
taking  you  to  the default third area, the game will bring you to an
alternative area, with more gold targets.