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The vast majority of sudoku puzzles that are labeled hard expert challenger are not really all that difficult. And in a surprising number of cases they are downright easy. The puzzles increase in difficulty throughout the four books in the series.
These books are good, But I am half way through level 1 and so far it is no more complicated than level 1. Perhaps I should have gone for level 3. Also the ad says "Mensa" but no where on the book.