I've previously bought a book from Aristotel Circle and found it extremely helpful and fun for my daughter to play. We just received the new WISC-IV book in the mail and as soon as my daugheter saw it she immediately demanded we sit and play. She is so engaged by this book she can't put it down !!! It is a joy to watch a 6 year old want to learn, want to do more, want to be challenged & best of all want those stickers !!!