A card is randomly drawn from each of the three piles of cards: suspect, murder weapon, and crime location, and covered with a blocked card indicating that a murder has occurred. The remaining twelve cards are assigned to the players' hands, and the players can filter out the evidence cards in their hands according to the existing clue cards in their hands, and then one of the players who dealt the cards first asks a question to the right-hand player, asking the question of who committed the crime in this case. The question must contain two elements, either in the same category or in different categories. If the clue card contains the element in the question, you need to show it to the player who asked the question, if you have both cards in the question element, you only need to show one of your choice, if you have neither, you need to answer "I can't help you". Each player can get the information they need when asking, answering or waiting. When a player has already reasoned out the three elements of the case, that player can make an accusation before he or she asks a question, place his or her three evidence cards as the answer cover on the table, go alone to check the three cards under the crime card, if correct, the game ends and declares that player as the winner, otherwise declare defeat and disclose the clue cards in the player's hand, and the rest of the players continue the game after getting the information.