Supervised by a professional! A book of brain exercises that will make you fall in love with PHP. Get rid of your senility with super difficult questions! 100 brain training questions, 1 question per day / 85104 1

●Country of production: Japan. A popular book containing questions supervised by neuroscientist Shinohara Kikunori. ・Keep your brain healthy with these challenging brain training questions! - Exercise your brain to the fullest with 100 extremely difficult questions that can only be solved by using your brain to its full potential. *Not sold at general bookstores.