This software provides 1000 challenging printable Sudoku puzzles that require advanced strategies like Uniqueness, Single Digit Patterns and Fish techniques to solve.

One of the key strategies you'll need to master is Uniqueness, which involves identifying cells with unique candidates. This can be particularly tricky in the harder puzzles, but it's also incredibly satisfying when you finally crack the code.
Another important strategy is Single Digit Patterns, which involves identifying patterns of numbers that only appear once in a given row, column, or 3x3 square. These patterns can be subtle, but they can also provide important clues to help you solve the puzzle.
Finally, you'll need to master the art of Fish, which involves looking for patterns of numbers that appear in only two or three rows or columns. This technique can be particularly powerful in the extreme Sudoku puzzles, where the patterns can be more complex.
Overall, I would highly recommend the 1000 very hard printable Sudoku puzzles to anyone looking for a serious challenge. With plenty of strategies to master and a wide range of puzzles to choose from, you'll have hours of fun (and frustration) trying to crack these mind-bending puzzles.
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