Title: worth your while
Review: as per previous reviews, the only fault I have with the book is that it does tend to get repetitive and, as far as challenging goes - well, some of the problems are a measure of sheer tediousness rather than smarts. But perhaps that's good in developing EQ so a benefit to be gained anyway. If you like 'puzzles' then this is not a book for you. It is a series of IQ tests.
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