Using their credit cards for online shopping without their parents' consent is unethical and may be illegal. Credit cards are a financial tool for parents, and their express permission is required to use them. Even if you plan to repay the money in the future, unauthorized use of another person's credit card still constitutes fraud and may have serious legal consequences. In addition, this behavior may also destroy the trusting relationship between you and your parents. Trust is a very important part of family relationships, and once lost, it can take a long time to rebuild. If you really want to buy a certain game, it is recommended that you communicate honestly with your parents and explain your thoughts and reasons. They may understand your needs and be willing to help you. Alternatively, you can also consider other ways (such as saving pocket money or working part-time) to get the funds needed to buy the game. In short, it is very important to respect the property and trust of others. Achieving your goals in an honest and responsible way will not only allow you to get what you want, but also maintain a good relationship between you and your parents.