Nes games compatible with zapper gun.

[Doonzmore]

Duck Hunt
Hogans Ally
Gumshoe

What are the others?

[Drexel923]

Freedom Force
Mechanized Attack
Operation Wolf
Barker Bill's Trick Shooting
Shooting Range

[Cauterize]

Wild Gunman

http://spacemul.emu-france.com/images/Nes/3/6032.png


Duckhunt

http://spacemul.emu-france.com/images/Nes/3/4894.png


Gumshoe

http://spacemul.emu-france.com/images/Nes/4/5072.png


Hogan´s Alley

http://spacemul.emu-france.com/images/Nes/3/5104.png


To the Earth

http://spacemul.emu-france.com/images/Nes/3/5933.png


Track 'n' Field 2

http://spacemul.emu-france.com/images/Nes/1/5957.png


Trickshooting

http://www.planetnintendo.com/nindb/nes/zt/shot-1.jpg


Bayou Billy

http://www.consoleclassix.com/info_img/Adventures_of_Bayou_Billy_NES_ScreenShot2.jpg


Freedom Force

http://spacemul.emu-france.com/images/Nes/3/5000.png


Gotcha!

http://spacemul.emu-france.com/images/Nes/4/5060.png


Shooting Range.

http://spacemul.emu-france.com/images/Nes/3/5740.png

[Drexel923]

and some more...

Baby Boomer
Chiller
Gotcha!
Laser Invasion
To The Earth

all of this info brought to you by the trusty Online Rarity Guide.

[digitalpress]

Duck Hunt
Hogans Ally
Gumshoe

What are the others?

This might help fill any gaps.

1. Go to the Online Datbase: http://www.digitpress.com/DP/cmf/search.cmf
2. Pick "Nintendo NES" from the systems list.
3. Pick "Target Shooting/Gun Games" from the genres list.
4. Click "Find It".

This may give you more than you need - gun games that aren't actually compatible with the Zapper, but you'll be able to tell for sure by looking into the individual titles (the "Special Peripherals" will note this).

Hope this helps!

[NeoZeedeater]

There's also The Lone Ranger which uses it for some parts.