DoYouKno: Quiz & Trivia is a free quiz game available on iPhone, Android, and the web. It offers more than 6,000 questions across topics including flags, capital cities, history, sports, and general knowledge. Questions are presented in quizzes with answers and explanations. Players can take a daily quiz with the same questions as other players using the same language, or challenge friends to duels. In a duel, both players receive the same questions and can answer at different times; the higher score wins. Scores from daily quizzes, practice rounds, and duels contribute to leaderboards for friends, countries, and individual topics. The game also includes timed flag rounds, letter based spelling questions, spins, daily gifts, streak rewards, and quizzes on subjects such as football and seasonal traditions.