Shuffle Islands This game describes an algorithm for shuffling cards fairly. It's used in statistics, cryptography and computer games. It has to be implemented carefully because a common mistake produces a shuffle that's catastrophically biased ... I've chosen the format of an Interactive Fiction ("Choose Your Own Adventure") game rather than an article because I can use games, random events and quizzes, and because you can skip sections if they don't interest you. Please explore the islands at your own pace and don't feel required to visit every section.