Decktective: The Gaze of the Ghost is a co-operative investigation game, including a 3D crime scene. Players must work together to solve a mysterious case. They play their cards to share information, discard cards that they think will lead them the wrong way, discuss clues they find with the other players, make hypotheses and deductions to find the solution! At the end of the game, players must answer several questions: Each correct answer is worth points. The more points they get, the better the final outcome.

On their turn, a player either plays a card from their hand and puts it face up on the table, sharing the information on it or they discard a card from their hand face down to the archive and are not allowed to talk about the information on it, until the end of the investigation. Each card has a value from 1 to 10 located in the upper left corner. A card only can be played face up on the table if its value is equal to or less than the current number of cards in the archive.