Printable Hard Sudoku

Set ui8fxh. 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 5 1
1 8 3 6
2 1
3 6
7 6 1 2
9 8 7
9 7 5
2 4 1 5 8
4 9 7
Hard #2
5
6 7 4 5
3 8 6
4 1 9 3 7
9 1 4 6
5 3 8
8 3 7 1
2 5 9
3 2
Hard #3
9 7 6 3
2 6 1 7 8
2
7 6 4
7 3 8 5
3 1
5 4 2
4 7 8 3
5 8 2
Hard #4
3 6 8
8 5 9 3 6
8 4
9 1 7 8 3
3 8 4 2
7
4 6 7 1
1 7 4
2 7
Hard #5
8 9 6 7
5
7 3
6 1
1 8 2 4 5
4 2 9 8 6
6 5
2 3 8 6 9 5
4 8
Hard #6
2 4 9 1 6
2 3 7
6 8
4 5
9 5 4 1
5 3 1 2
9
3 8 1 6
2 7 3 5
Hard #7
5 7 1
8 2 9 6 5 7
3 8
8 6 3
2 6 7 9
7 1
2 5 1 6
5 1
1 3 8
Hard #8
7 9 4 8 5
8 5 7
2 1 6
4 2 3
6 8 9 3 1
9 3 4
2 8
7 8
3 2 1

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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