Jack and Detectives is a game with the theme of the Jack the Ripper incident that occurred in London in the 19th century. The player will be the character in this case as the murderer ‘Jack the Ripper’ (Jack), the ‘Detective’ chasing Jack, or the ‘devoted” who cooperates with Jack. If two victims are killed, the investigation will be terminated, and Jack will be nominated and arrested among the detectives, and the game will be settled.