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1: Sudoku 25x25: Volume I Paperback – June 8, 2009
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If someone has the patience and inclination, this has to be right there next to Arto Inkala's puzzles. Definitely have blank grids and separate scratch paper so all the erasing doesn't overdarken the puzzle or wear down/tear the pages. Great book to take anywhere, but brush up on easier 25 x 25 puzzles before tackling these.
Other than that, it's arguably one of the ultimate sudoku books and I don't regret buying it, it has pushed my sudoku to a new level. Now I just have to solve 500 puzzles LOL!!