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In this video, I'll be introducing "9 problems that only people with flexible brains can solve"! If you're confident in your mental flexibility, please give it a try. By stimulating your brain, your IQ will improve, so please try the quizzes in other videos as well♪ 9 problems that ordinary people with rigid brains can't solve [Part 1] • 9 problems that ordinary people with rigid brains can't solve [Difficult IQ test] 13 problems that ordinary people with rigid brains can't solve [Part 2] • 13 problems that ordinary people with rigid brains can't solve [Part 2] 15 problems that ordinary people with rigid brains can't solve [Part 3] • 15 problems that ordinary people with rigid brains can't solve [Part 3] 15 problems that ordinary people with rigid brains can't solve [Part 4] • 15 problems that ordinary people with rigid brains can't solve [Part 4] I read all the comments! Thank you for your continued support. The copyrights and portrait rights of images used and posted in the videos on this channel belong to the respective rights holders. The content of the videos is produced with the utmost care so as not to cause any disadvantage to the respective rights holders or third parties, but in the unlikely event that there is a problem with the content of the video, we would appreciate it if the respective rights holders themselves could point it out. #Slow commentary #IQ test #Logic quiz