Printable Hard Sudoku

Set qx1u89. 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
5 8
2 9 3
1 9 5 2 6
6 3 1
8
5 6 2 9
9 2 8 7
4 5 7 3
8 6 1
Hard #2
2 9 3 1 7
3 8
7 3 2
4 9 6 5
6 9 4
3 2 6
2 4 6 1
1 7 3
1 2
Hard #3
4 9 3
7 8
6 2 7 9
2 6 5 8
6 2 8
8 1 4 2
5 3 1
6 8
5 3 7 6
Hard #4
5 2 3 8 1
1 9 7 5
7 4
2 8
2 7 6
9 5 6 7
7 4 8 9
1 3
3 5 9
Hard #5
9 1 4
3 6 9
8 3 2 1
3 1 5 8
4 5
2 3 1 8
2 8 7
8 5 2 6 9
6
Hard #6
5 4 7
9 4 3 8
8 7 4 6
8 5 2
5 1 6 4
4 7 8
9 3
8 1 2
2 6 1
Hard #7
6 4
2 9 5
2 3
9 4 8 3 6 2
5 9 8 4
5 3 1
1 7
6 2 4 3
6 5 8
Hard #8
9 2 8
6 9 8 1
3 1 4
2 4 6 3
7 9 5 3
5 2 1
1 6 2
1
4 5 8 7

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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