Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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