Kerf Puzzle

Hard Sudoku

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About Hard Sudoku

Here are 100 Hard puzzles to play or print. Each starts with 23 to 30 given digits, has exactly one solution and can be solved by logic alone.

How to play

Fill the grid so that every row, every column and every 3x3 box contains each digit from 1 to 9 exactly once.

Solving techniques, step by step

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