Printable Hard Sudoku

Set t4zisb. 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
8 4 1 7
7 3 4 6
6 9 7 8
1 7 8 9
5
3 8 1 2 9
5 6
5 9 4
6 2
Hard #2
3 4 5
5 7
7 4 9
3 6 1
4
1 2 8 3
9 3 5 2
1 8 2
3 2 9 1 5 4
Hard #3
9 7 4
1 5 2
3 4 9
7 2 8 9
6 8 1
3 6
8 5 9 4
5 4 8 3 1
6 2
Hard #4
9 8 2 5
4 3
1 7 6 8
7 3
5 9 7
2 3
8 1 5 6
1 2 4 6
4 8 5 1
Hard #5
4 1
9 8 7 5 1
1 8 7
2 1 8
1 3 6 5
5 2 3 4
6 3 4 9
4 5
2 1
Hard #6
2 7 3 8 1
5 4 2 9 7
1 6 2
7 5
2
4 8 5 7
2 6 8 9
6 4 3
9 7
Hard #7
6 3 7
5 2 1 6
1 7 3 5 2 8
5 6 1
8 2
8 1 6 9
9 6 7 1
5 3 7
Hard #8
5 4 9 6
5 2 3 9
9 8 7
1 6
3 7
9 7 4 1 5
7 4 3
2 6 3 9
1 6

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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