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1: Sudoku 9x9: Volume I Paperback – December 13, 2012
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IMPORTANT: In having solved the first 17 puzzles in this book, I would note that some of these puzzles DO NOT have unique solutions. So your solution could still be correct, but you would have to scan each row, each column, and each box for 1-9 and no repeats to verify that it is correct. It might not agree with their solution, but again, some of these puzzles DO NOT have unique solutions. It can still be a bear to solve though.
I would highly recommend buying this book first before the larger grids which are more labor-intensive. 1008 puzzles are plenty of practice developing your own technique for solving, and these puzzles are difficult enough to make you do something to keep track of information. You just have to- it makes sudoku much less frustrating and confusing.
Plus if people accuse you of cheating, you can show them how there aren't any solutions in the back and have to look them up online. Some of the puzzles are so difficult that ABCOM's own solver returns "unsolvable"- when you CANNOT "cheat", you have truly difficult puzzles.
Oh, no difficulty ratings, just arbitrarily difficult, as in you better know what you are doing. Get all the row/column eliminations, X-wings, swordfish, etc. out of the way first. When you can't find any pairs, triplets, quadruplets, etc., try assumptions that create a domino effect. You want to know if an assumption(s) is right or wrong- inconclusives only help if you are solving permutationally and all permutations that DO NOT lead to a conflict share common information. Then regardless of which permutation actually solves the puzzle, some parts of the permutation can end up always being true (or false, where you can eliminate pencil marks). Each puzzle is not only a puzzle, but puzzles within a puzzle.
Pro: 1,200 sudoku puzzles! :) not super easy. More like mix of medium/easy puzzles varieties.
Cons: 12 puzzles on per page! So its pretty small but readable still like books. My advice is dont use pen on this book bc of size. But
My recommendations is that if many puzzles on per page doesnt bother you then go for it.