Sudoku365
Hard Sudoku for Wednesday, January 21, 2026
Hard
30 clues
0:00
7
1
4
2
5
3
4
2
7
8
5
3
6
1
2
5
1
6
3
6
4
5
1
9
8
3
6
5
2
8
About This Hard Sudoku Puzzle
This hard difficulty Sudoku puzzle for Wednesday, January 21, 2026 starts with 30 given numbers. This puzzle demands advanced strategies including locked candidates and pointing pairs. Experienced solvers will enjoy the challenge.
How to Solve This Puzzle
Click any empty cell and enter a number from 1-9. Use logic to determine which numbers can fit in each cell based on the Sudoku rules: no repeating numbers in any row, column, or 3x3 box.
Keyboard Shortcuts
- 1-9: Enter number in selected cell
- Arrow Keys: Navigate between cells
- Backspace/Delete: Clear selected cell
Tips for Hard Puzzles
- Apply Locked Candidates (Pointing Pairs) to eliminate options
- Look for Box-Line Reduction opportunities
- Maintain pencil marks (candidate notes) systematically
- Study our Locked Candidates tutorial