Hard Sudoku
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About Hard Sudoku
Here are Hard puzzles to play or print. Each starts with 23 to 31 given digits, has exactly one solution and can be solved by logic alone.
- Hard · hardest step: Naked pair, Hidden pair or Naked triple
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