Duck Hunt usually came on a "multi-cartridge" (authorized by Nintendo), along with Super Mario Brothers in one SKU. In another version, it came with SMB and a running game, when the NES Power Pad was included.

My least favorite part of the game was the dog. I can't tell you the number of times i spent trying to find a way to use that third bullet on him, after he mocked me for missing the ducks.

The third game (single ducks and double ducks were the first two), Clay Pigeon Shooting, is the hands-down hardest shooting game for the NES, but as well the most rewarding. Picking off that little blip just above the horizon feels good (not to mention worth the most points).