L.A. Noire is a hard-boiled detective game set in Los Angeles of 1947. Drawing strongly from the stylistic film noir , players control LAPD officer Cole Phelps through 21 cases as he works his way through the ranks of his department to solve a series of murder mysteries. Each case forms an independent section in the game, but there is an overarching story with recurring characters and Phelps's personal history while serving during the Second World War. He starts off as a patrolman, but eventually advances to a traffic detective, homicide, vice, and finally arson investigator. With each promotion, a new partner and new locations become available.
The gameplay involves a mix of slower investigative elements and fast-paced sequences that include on-foot and car chases, and gun-play. There is a strong focus on the story and character development, often with long cinematic sequences. The player has freedom to explore by car and on foot, but with restrictions on attacking civilians and specific locations for each case. Each case must be completed in a satisfying manner before progressing.
When arriving on the scene of a murder case, it's essential to find clues that can be researched. The game provides hints through sound cues when Phelps walks by, which can also be disabled. Armed with evidence, the next step is usually interrogating witnesses and suspects. Characters' faces have been animated using MotionScan technology, adding to the realism. Interrogations involve interpreting facial expressions, tone of voice, and reactions to decide how to proceed through one of three options: Truth, Doubt, or Lie.
Each case takes about an hour to complete. The player earns ranks that provide intuition points, which can be used to eliminate options during conversations when stuck.
The game offers a unique blend of storytelling and gameplay, with plenty of opportunities for players to correct mistakes and try new approaches.