Printable Hard Sudoku

Set 1vikz4f. 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
9 4
3 8 5
8 1 6 2
6 2 9 4
9 5
9 3 5
1 6 2 8 3
2 7 8 6
3 4
Hard #2
6 3 2 9
1 2 5 7
2 7 1
8 3
5 2 6 7
5 3
1 3 5
7 4 1 8
5 9 4
Hard #3
2 1 7
6 9 1
9 2 6 5
1 3 7
9 8 1
8 7 2 9
4 7 6 2
1 8
1 3 6
Hard #4
3 5
2 1 7 3
7 6 2 3 9
1 8
8 2
4 2 9 6
2 4
5 7 1 8 9 4
6 5
Hard #5
2
7
2 9 4 3 1 7
1 9 3
6 3 5
3 7 5
6 5 1 4
5 6 1 2
7 4 9 8
Hard #6
2 6 1 5 9
1 5 2
3 1
1 4
4 6
3 7 4
9 3 5 2 7
5 2 3
8 4 6 3
Hard #7
9 6
1 8 2 4
6 4 3
1 7 3 5 6
3 5
9 6 1
5 3 1 8
4 8 1
4 9 7
Hard #8
1 4 2
7 3 2 9
4 7 3
4 5 9 8
9 6
5 1 2 7
8 6
5 6
4 2 8 1 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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