26 – 28 Clues Given
Free Hard Sudoku Online — Advanced Logic Puzzles
Challenge your mind with Hard Sudoku. With fewer clues (26-28 numbers), this level requires candidate notes and pair eliminations.
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Medium Sudoku Puzzle
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Hard Sudoku
Naked Pairs & Triples
Pointing Pairs (Line-Box Reduction)
Hidden Pairs
Rules:
- Systematically mark all valid candidates in remaining empty cells.
- Look for two cells in the same row or box that share the exact same two candidates.