This is a talk aimed at people interested in making or playing video games. It presents a brief history of morality systems in games before going into depth into what makes for ethically relevant games. How should games present moral choices to players? How can games capitalise on and test players' morality? How can you build good ethical experiences in games? Dr. Catherine Flick, a technology ethicist with a long-term love of video games, discusses these questions and more.