In applications, the letters "P", "I" and "G" represent different digits of a number, cleverly mapped as follows: P corresponds to the hundreds digit, I corresponds to the tens digit, and G corresponds to the units digit. By this rule, we can infer the number in the box based on the position of each letter. Each puzzle provides different clues, and we choose the correct answer based on those clues. In the process of solving, I will help you record the score and keep the wrong questions, so that you can review and improve.