Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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