At five specific times during the game, Mr. X has to reveal his current position. Detectives will take this opportunity to refine their search and, if possible, plan ways to encircle him. After Mr. X has revealed himself, the types of transport that he uses on the next few turns limit the number of possible spaces that Mr. X could be on, providing useful information to the detectives (as well as preventing some types of cheating from the person playing Mr. X).