Printable Hard Sudoku

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

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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