This is a book of very difficult Sudoku puzzles. ALL PUZZLES require you to apply one of the two advanced Sudoku solving techniques: X-Wing or Swordfish.
However, all puzzles can be solved without guessing and have one solution only. If you need help, you can always peek at the solutions.
Remember: do not guess!
The book is small in size but the numbers are printed in large font, so they are easy to read.
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