I do sudokus all the time too. I use the books to pass the time in the van when I am waiting for kids at schools, or do them while sitting with the kids at naptime waiting for them to all drop off to sleep. I've even got my daughter started on them, though she doesn't do them as often (she's 9 and going into 4th grade math) and she has a harder time with the 9s, she prefers the 4s and 6s. I like that conceptis site as well because not all of the weekly puzzles are 9s, there are some variations.
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