開心知識問答 is a puzzle game designed for Android devices. It offers a wide range of trivia questions across various categories such as physics, sports, nature, literature, politics, geography, general knowledge, history, chemistry, astronomy, music, travel, technology, and computers. With a total of 21,688 questions, this game provides a challenging and educational experience.

The game allows users to select specific categories to answer questions from, and the system automatically judges the correctness of the answers. Users can also bookmark their favorite questions or seek help from friends by sharing questions via email or SMS.

In addition to the quiz section, 開心知識問答 also features an entertainment section. Users can stay updated with the latest and most interesting microblogs, share their thoughts on QQ space, and engage in discussions on various topics such as humor, literature, food, fashion, movies, and more.

With its diverse range of questions and entertaining features, 開心知識問答 offers both educational and recreational value to its users.