Hi, addicted to gaming.
Thank you for the question. Your Game Center account is your Apple ID and password. You can either reset the password at https://appleid.apple.com/ by answering the security questions or through Email authentication. Try the email authentication method to see if you receive the password reset link. Make sure to check your spam folders on your email account as it is sometimes identified as a spam message.
Since the security questions are unable to be answered, I have attached a link on how to reset your security questions. If the steps in the attached article are unsuccessful, see the last section labeled Additional Information.