Hidden Motives: Diamond Rush is a hidden object game with point-and-click controls. The main character is the sheriff's daughter, who plays a key role in the new film. She had long dreamed of being invited to film in a good studio. She was told to get used to the role, which is what happened. She found herself inside a fictional story, finding herself in a parallel reality, where she had to find solutions and answers to many questions.

Having begun exploring a new environment, the protagonist meets with local residents and learns that she is in the city of Redsand. There are often raids by bandits, robbing and maiming civilians. Recently, the first horrifying incident occurred – a serial murder. The inhabitants of the town blame the Diamond Ghost, with whom the heroine must negotiate or destroy in order to help the innocent townspeople. In Hidden Motives: The Diamond Rush, gameplay is focused on finding things and interacting with the environment.

The player controls the sheriff's daughter, who finds herself in the Wild West. She investigates the crime and tries to prevent further attacks from bandits. The gamer will have to find out the circumstances of the mysterious deaths of miners and numerous robberies. To reveal the truth and return home, the heroine will need to play her role perfectly. In the passage there are puzzles and hidden places to explore.