VERDICT: The most challenging sudoku book ever, but with brilliant explanations of techniques and variations. If this is not enough, you can look further in the next two areas offering you 2 other hints.Īnd if you are really desperate, the answer key is at the very end of the book. So here, for each sudoku, you get a hint, telling you the number you should put in one square. Most books I know just give you the answer key, and it’s always hard to just look at say, one line, to help you when you are stuck. There are 240 Sudokus in total offered here by Cristina and Rick Smith, who are brother and sister.Īnother clever element of the book is the Hint section. If you still have hair on after sudoku #190, you can try the Extra Credit section, with more crazy variation, like the Kropki explained above. So once you feel ready, you can start having fun.Īnd no, the book does not begin with easy Sudokus! The three levels are Tough, Tougher, and Tear-Your Hair-Out! The choice of each number is not random, but must respect three basic rules: there cannot be repeated numbers or in the same row, neither in the same column. Empty the 5-gallon jug and pour the 1 gallon of water from the 3-gallon jug into the 5-gallon jug. Refill the 3-gallon jug and pour the water into the 5-gallon jug until the 5-gallon jug is full, leaving 1 gallon in the 3-gallon jug. Cells without circles between them are neither double nor consecutive.Īll these variations can still be solved with the same main techniques, that are very nicely explained in the first part of the book, with examples (Naked Pair, Swordfish, etc). Fill the 3-gallon jug and pour the water into the 5-gallon jug. In the latter, the digits are consecutive. In the former case, one of the digits is twice the other. – Kropki Sudoku, with cells separated by a black or a white circle. – Diagonal Sudoku: the two diagonals of the grid each also contain digits 1 through 9 I will just give here a couple of examples: Actually thanks to this book, I discovered that there are many variations, with almost 20 kinds presented here! Like me before I opened this book, you may think all sudokus are the same, beside the level of difficulty. The Toughest Sudoku is definitely the best and most challenging collection I have ever found. For me, using my brain is actually the most enjoyable way of relaxing. Price: US 13.50 History: 1 sold Shipping: Free 3-4 day shipping. Lot of 4 New Dell Penny Press Sudoku Puzzle Books Number Puzzles RANDOM MIX: Condition: Brand New. For some, after a tough day, they just want to watch an easy movie. Details about Lot of 4 New Dell Penny Press Sudoku Puzzle Books Number Puzzles RANDOM MIX See original listing.
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