GamePlan is a web application that's designed to help users reflect on their sex lives and their risks when they get tested for HIV. By adopting principles of an efficacious counseling approach called "motivational interviewing," this app encourages users to consider making safer decisions through a non-confrontational, non-judgmental, and fun approach. The app provides clear feedback about users' choices and the risks involved, and helps them explore the potential for change with several interactive games. If users are interested in making a change, GamePlan helps them make a plan for doing so, which they can anonymously print or email to themselves, along with resources that can help.