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Who Shot Johnny Rock? is a live-action full-motion video video game produced by American Laser Games.

The game is set in a Hollywood version of 1930s Chicago, where one plays a private detective that has been hired to find out who murdered a nightclub singer named Johnny Rock. The player must attempt to reach Johnny Rock's killer, shooting villains and interrogating individuals. The game takes the player through the gangs of four gangsters with suggestive names - Measles, Mumps, Smallpox, and Lockjaw Lil, each of whom knew Rock and are suspects in his murder - and locations such as a warehouse, a pool hall, a garage and a casino.

As is the case with other American Laser Games releases, the game is played from a first-person perspective of the player watching the full motion video, listening to the various characters and shooting the right enemies at the right times with a powerful Tommy gun.

Unlike previous games, such as Mad Dog McCree and Crime Patrol, the player's Tommy gun does not need to be reloaded, but one does need to buy extra ammunition. Also, when health is lost, the player must purchase extra lives from the city doctor. If money runs out, the game is over. The player must also try to avoid hitting innocent bystanders, as doing so results in having to pay funeral expenses. The doctor also gives advice (usually fake) and criticizes the player's actions.

Along the way, the player must collect clues, which will eventually allow the player to determine Johnny Rock's murderer. One of the final sequences takes place in Rock's mansion, where a final clue will point to the killer, who must be defeated and apprehended to win the game. The identity of the killer is determined randomly on each playthrough from one of the four suspected gangsters.