9x9 Hard Jigsaw Sudoku Puzzles

Jigsaw Sudoku, also known as irregular Sudoku or irregularly shaped Sudoku, is a popular variation of the classic Sudoku puzzle. In traditional Sudoku, the puzzle is divided into a 9x9 grid, further subdivided into six 3x3 sub-grids called "regions" or "boxes."

The goal is to fill in the grid with numbers from 1 to 6 in such a way that each row, column, and region contains every digit exactly once.

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