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In this video, we will introduce 15 problems that ordinary people with rigid brains cannot solve! If you are confident in the flexibility of your mind, please give it a try. By stimulating your brain, your IQ will improve, so please try the quizzes in other videos as well♪ 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. We have taken great care in creating the content of the videos 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 videos, we would appreciate it if the respective rights holders could point it out to us. #Slow explanation #IQ test #Logic quiz