33IQ is an online Chinese-language platform for thinking and brain training, bringing together a large collection of puzzles and interactive activities designed to make learning engaging. Members can publish, answer, and save questions, exchange ideas with other users, and build their reasoning skills while exploring new knowledge.

The platform offers themed practice in a range of subjects, with new collections updated every Friday evening and occasional advanced challenges. Its 60-day intelligence challenge guides participants through a sequence of questions intended to develop logical thinking. In situational guessing games, players ask questions to uncover the explanation behind an unusual event. 33IQ also provides puzzles, brainteasers, and tests covering areas such as intelligence, psychology, and personality, as well as competitions, rankings, and a mobile app.

For members seeking a more challenging community, 33IQ runs the OTF High-IQ Club. Entry involves a screening test, and club activities are designed to encourage mutual recognition and development. Membership benefits include a dedicated status marker, in-person events, monthly news, and exclusive gifts.