In the next frame, the area the duck occupied turns white while the rest of the screen remains black. If the light sensor detects light in that second frame, your gun is on target. If the light sensor does not, the dog is going to laugh at you.
When there are two ducks on the screen, three frames are used. The game will show a black screen, then a black screen with one of the ducks turned into a white square, and then a third frame with the other target illuminated.
That's it. Such a simple device. It's really a shame they've never improved on video games since then. This was the perfect game. Basically everything has been downhill from this cartridge. Everything.
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