CSI: Hidden Crimes is a mobile game based on the CSI TV series set in Las Vegas. The player is a new investigator and has to solve a murder cases. Most of the time the player is on the different crime scenes, where hidden object games are played. Each crime scene contains evidence that need to be found for further investigation, as well as "normal" hidden objects which only provide points. With enough points a star is achieved and each crime scene offers five different stars.
The stars are needed to unlock new episodes and chapters, as well as for further investigations. Some evidence requires analysis which is performed through a mini-game. There are also suspects to interrogate. The player reads only the dialogs from the interrogation and these also cost a star.
The game is free-to-play, but energy is required to keep playing. It can be restored by waiting or with food. Some analyses are not made by the player, but by the lab which requires waiting time (or money). New cases are gradually released as new episodes.