Printable Hard Sudoku

Set 177tn. 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
1 9 4
3 8 9 4 1
2 3 9
6 2 4
4 2 1
8 1 9
9 6
5 8 3 6 7
2 9
Hard #2
4 6
3 1 2
8 5 7 9
1 4 6
6 9 7 3 4
9 2 5 6
9 1 5
2 7
6 5 4
Hard #3
6 7 1
2 5
8 4
1 8 6
4 9 1 2
8 5 7
1 5 3 7
4 7 8
8 2 9 4 5
Hard #4
4 9 8
2 8 1
9 2
8 2 6
1 9 3 4 7
3 1 4
3 7
7 8 1
9 4 1 8 2
Hard #5
7
6 4 9 5 8
5 1 3
3 7 2 9 6
6 1 2
4
8 7 4 3 9
4 2 5
5 3 7
Hard #6
9 1
7 4 2 9
8 3
7 6 5 9
8 6 7
8 1 4
7 9 5 4 2
9 6 3
6 1 8
Hard #7
5 1 7 6
7 2
2 9 4 1
7 5 2 6
4 5 3
2 1 3
6 8
9 8 5
8 4 5 9
Hard #8
4 7 1 8
3 5 9
9 5 3
7 1
1 7 8 6
6
5 1 3
1 7 3 6
9 8 7 2 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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