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In this video, we will introduce "15 Tests to Test Your Brain Power [Part 4]"! If you are 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♪ ■Trick Quiz Series • Trick Quiz Series ■Series that only flexible thinking geniuses can solve •Series that only flexible thinking geniuses can solve ■Series that tests your natural intelligence •Quizzes that test your natural intelligence ■Miserable Reasoning Quiz Series •Miserable Reasoning Quiz 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 explanation #IQ test #Logic quiz #Inspiration quiz #Difficult question #Super difficult question #Brain power test #Riddle #Riddle problem #Matchstick quiz #Lateral thinking quiz #Riddle solving #Mayer's IQ test #Crossword #Crossword puzzle #Kanji fill-in-the-blank #Kanji problem #Brain training quiz #Brain training #Brain training for seniors