As a tester, you must complete the case’s cracking under the system’s rules. The cracking process of the case is very similar to the real police case. The cases in the system all happened in Chicheng and are stored as key clues. Each clue contains different and essential information about the case. You need to constantly find new clues by looking at the information and fragmenting the clues. The content pieced together the completed case in your mind and reasoned out the course of the case. As long as you answer the correct questions about the case in the system, you can crack the case. After cracking the case, you can view the criminal’s “criminal statement”. Clues are interconnected. To move the case forward, it is necessary to find the information needed to discover another clue from one lead. In the process of cracking the case, you sometimes need to perform special operations on some clues, such as inferring the motives of the characters to complete the “search warrant” for the clues of the characters and inferring a reasonable time to “invoke the monitoring” to check and reason out. After the correct password of the encryption clue is “decoded”, the encrypted content can be viewed, and so on. The more user-friendly design is that you can ask the system for help when you have no clue. The system will give you a certain range of tips, but a certain amount of investigative points will be deducted. After you have solved all the cases, Chicheng police will give your final evaluation based on the detection points and your performance.