A free program for Android, by Dorling Kindersley.

The DK Quiz app is a fun and entertaining way to test your knowledge and is the perfect way to have a good time while learning something new. The app is full of quizzes, games, and challenges that will help you increase your IQ and learn more about the topics you are interested in. You can check your rank on the leaderboard, which will let you see how well you did compared to other players. The app is free to download, and there are no hidden costs or charges.

The app is made to help you increase your IQ and learn more about the topics you are interested in.