Cash Noire immerses players in a gritty detective story set in a rain-slicked city reminiscent of classic film noir. The game utilizes a cascading reels mechanic where winning symbols disappear and new ones fall into place, potentially creating chain reactions. A 'Crime Zone' highlights a specific area on the reels, and symbols landing within it activate a Clue List meter. Filling the meter triggers Free Spins, where players track a suspect across a city map for increasing multipliers.