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.