Printable Hard Sudoku

Set 1v3mbx7. 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
3 4 2 1
8 3 2 4
1 7 8
4 3
9 6 7
7 8 6
4 9 3
5 3 6 7 4
8 2
Hard #2
2 4 1
1 2 6 9
6 9 5 3
2 7 8
4
7 5 4 6 1 9
6 3 5 7
3 1 8 6
Hard #3
1 3 5
7 5 9 4
9 3 6 7
7 4 1
8 3 2
2 6 8
6 5 9 1
2
5 8 3 6
Hard #4
3 4
6 8 2 9
1 2 5 6 4 3
2 9 1 3 8
7 6 8 1
2
9 4
1 5 7
6 2
Hard #5
9 3 5 8
4 5 8
8 2 1 6
3 2
7 6 3
6 8
4 7
9 5 2
2 8 6 4 7 1
Hard #6
1 8
9 1 7
6 4 9 2
3 6
2 1 5 3
3 8
8 9 1 4 6
7 1
5 9 6 3 4
Hard #7
7 4 9 1 2
9 7
1 2 9 8
2 5
1 8 4 9 6
7 9
8 9 1 3
6 2 3 8
7
Hard #8
6 3 2
2 1 7 4
2 7 5 9
3 6 4 8 1
5 7
8 3 4
5 8 9 1
2
4 9 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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