You cannot secretly use your sister's ID card to participate in online games. First of all, using someone else's ID card is an act of impersonation, which is not in compliance with regulations and moral requirements. Secondly, many online games have real-name authentication systems to ensure that players are adults and prevent minors from being overly addicted to games. Secretly using your sister's ID card to play games violates the rules of the game and relevant management regulations. Moreover, excessive addiction to online games by minors will affect their academic performance, physical health and normal social life. We should focus more on learning and healthy growth, and enrich our extracurricular life by participating in beneficial activities, rather than secretly playing games. So be sure to abide by the regulations and don't do this.