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In page NES Zapper:

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The NES Zapper can only be used on CRT displays; it will not work on LCDs, plasma displays or other flat panel displays due to display lag. This darkness/brightness sequence prevents the possible issue caused by pointing the Zapper right next to or into a light bulb.[3][4][5] Older light guns did not use this method, making it possible to cheat and get a perfect hit score in a way not possible using the NES Zapper.