Provided are a method and computer system that provide a virtual world. A server of the computer system includes a storage subsystem that stores two or more items of different personalized information about multiple different users, including different user identifications and passwords associated with the user identifications respectively representing the users. The server computer system is programmed to accept login credentials including a user identification and password and validate the login credentials. The server computer system is also programmed to control formation of a first user account and storage of the first user identification and first password. The storage subsystem stores information about registration codes that have not yet been entered. Further, the server computer system is programmed to accept entry of one or more of the registration codes that have not yet been entered and, based on entry of the registration codes, to associate stored information indicative of the one registration code with the first user identification.