Printable Hard Sudoku

Set 38bxup. 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 3
9 4 6 7
2 7 3
9 8 6
7 2 4 5 1
9 8
5 8 6 4
3 7 9
5 3 2
Hard #2
4 6 2 3
3 4 8
9 2 3 7 8 6
2 1 6 4
5 6 1 8
2
4 9
7 4 9 5
6
Hard #3
8 6
2 6 5 9
8 1 4 7
7 8 5
5 4 6
8 7 5 2 1 4
9 8 5
2
4 8 7
Hard #4
6 2
6 2 4 5 3
8 6 1
7 2 9
9 3 8 6 4
1 9 5 2
8 7 1 9 3
4 6
Hard #5
9 8 6 5 3
8 7
3 6
4 9
6 1 8
8 4 6
2 7 1 5 9
1 4
8 9 4 1 2
Hard #6
5 9 1 8
5 3 6 2
2 7 8 5
1 9
9 3 6 8
4 8
7 1
3 6 7 4 1 5
3
Hard #7
7 5
2 9 8
3 4 1 6
5 7
8 4 1 2 5
2 7 9 6
9 8 5 7
4 2
6 9 3
Hard #8
6 4 2 7
9 6
2 8 4 9
4 2 9 1
3 9 4
1 8 7
2 1
8 4 6
3 9 8 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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