Printable Hard Sudoku

Set xnl3gz. 8 puzzles with an answer key, ready to print.

Hard puzzles start with about 29 givens and need real techniques: pointing pairs, naked pairs and hidden pairs. Paper is a great way to practice them, because you have to keep your own notes honest.

Each free PDF has 8 puzzles, four to a page on US Letter paper, plus an answer key with every solution. Every puzzle has exactly one solution. A new set appears here every day, or you can grab a different set any time.

Puzzles in this set

Hard #1
5 4
6 1 7 3 4
9 4 6 1
8 5 4
6 7 5
3 6 8
5 2 6
7 4
6 1 3 7
Hard #2
3 9 5
9 3 1
5 1 4
4 7 8 5 9
2 4 1
2 3
3 1 6 4
2 9 5
6 9 7
Hard #3
3 8 5
9 6 1 2
7 5 2 4
2 7
6
8 1 3
3 5 4
3 8 2 1
1 4 9 7 3
Hard #4
2 1 4 3
4 6 8
5
4 9 6 1
3 7 9
2 7 6
2 1 6
1 4 8 9
6 5 1 4
Hard #5
1 2 7
4 2 6
8 7 9 4 2
5 1
6 4
3 2 6
7 3 9
8 7 1 5
1 4 2 7
Hard #6
5 6 1 4
3 5 2
2 4 8 3 5
2 3 9
6 8
1 6 3
6 1 7 4
5
3 1 2 8
Hard #7
2
6 4 7
1 9
6 8 3 1 2
2 8 5 3
7 3 6 4
4 5 6 3
5 8 1
7 2 9
Hard #8
1 9 7
7 6 4
9 5 4
4 8 2
3 7 8 6 4 1
8 4 1 5
9 6 5 1
9 6 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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