Sherlook elaborates the classic game of differences’ system through an ingenious mechanism that contains a little mathematical secret. There are 40 images in the game that apparently depict the same crime scene. A somewhat bizarre crime, because the scene is full of extravagant objects … By placing two of these images chosen at random on the table, the player may notice small differences between them, as if someone had intervened to alter the crime scene: Some objects are no longer in the same position, others have been stolen, still others have been replaced or altered in shape or color

How many are these differences in total?

You have to find out by being faster than the other investigators; each player can choose a value between one and ten, although the same number can only be chosen by one player, so once the investigation is complete, the two images are turned and the mystery will be finally revealed.