I, too, am addicted to this book. Can't put it down. Definitely a different mindset when you have to think in terms of letters instead of numbers. Probably good for the grey matter, though. A quick note on the review by J. Stoner. You actually don't have to unscramble anything with regard to the wordoku puzzles. Simply list the letters in order by rows, top to bottom, not in order of each 3x3 grid. Then all you have to do is figure out the word breaks. One warning, before buying this book, make sure you have plenty of spare time! And good luck.