It's Chicago in the '30s. Illegality is everywhere and you're an Eastwood clone sent to clean it all up with your trusty light-gun. Forget investigations. Forget "innocent until proven guilty". Forget the law. All you do is stand on a populated street and shoot suspicious looking people (those in long coats, with red hair, crooked smiles and so on). They're mobsters, and as such, they pop up from every window, through every door and in cars.
Making things a tad trickier are blameless civilians who, seemingly oblivious to the bloodbath going on outside their houses, look out and wave at you. Some of these are baddies in disguise - others aren't.
Each level sets you a target score to reach before you die of gunshot wounds or run out of ammo. Killing innocents reduces the score, and wasting bad guys increases it. So you've got some leeway to ice a few passersby if you're into that sort of thing.
You can pick up extra ammo from some mobsters, and can get bonuses from blasting bent cops - if you can identify them. This format is the same for each level, but there are whisky-bottle shootings in between.
Verdict
The Enforcer is the best of these three light-gun games. It's quick, accurate, carefully drawn and animated. The thrill comes from reacting fast enough to avoid being shot, at the same time as identifying the correct targets. It's actually pretty addictive and satisfying when you get good at it. The sound effects are well done too.