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.
- Hard · 100 puzzles · 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
Levels
- Easy Sudoku 100 puzzles
- Medium Sudoku 100 puzzles
- Hard Sudoku 100 puzzles
- Expert Sudoku 100 puzzles