Fun Fact: Hogan's Alley was hacked by digital artist Cory Arcangel, who turned the target characters into Pope John Paul II, Flavor Flav and Andy Warhol for an exhibit.
There weren't many games for the NES that utilized the Zapper light gun, but Hogan's Alley was almost enough to justify the peripheral alone. There were three game modes. The first slid three targets onto the range and then spun them all to face the player at once. Shoot the bad guys and get points. Shoot civilians and lose.
The second mode had targets popping up in the windows of buildings, like you might see in a police training course, and again the goal was to quickly decide if the target was hostile or not. The third mode involved keeping boxes in the air by shooting them.