Printable Hard Sudoku

Set 1gm5ce6. 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 6 9 8 1
1 4 6
8 5 7 2
1 6 3 4
7 9
8 6
1 2 5
2 7
8 5 7 3
Hard #2
4 7
7 8 3 9 4
5 1 3
2 6 7 1
3 9 6 2
8 6
4 8 3
2 5 1 9
2 4
Hard #3
9 3 5
1 7
8 3 6 1
8 5 4 2 9
4 5 7 8
2
7 9 8 3
3 7 1
3 1 2
Hard #4
7 2 6
5 6
8 3 9 7
1 6 4
4 9 2
7 6 8 1 5
1 5 7
3 9 1
6 7 2
Hard #5
1 6
1 7 3 2
4 9 3
7 5 9 8 2 1
9 4
1 6 2
8 3 4
3 5
9 8 7 6
Hard #6
4 8 1 9 6
7 3
3 8 6 5
8 4
3 6 5 2
7 2 5
3 9 8
8 7 2
1 5 4
Hard #7
9 1
6 4 5 9
3 9 2
4 9 6 3
7 3 9 6 8
7 2
8 4 2 9
6 3
5 8 1
Hard #8
5 1 6 8 4
7 8 9 2
2 5 9
7 5
1 7 4 6 3
3
3 5
1 4 9 6
4 1 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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