Printable Hard Sudoku

Set 1ey188q. 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 4 9
9 1 7 3
9 8 6
7 4 5
2 3 1
5 1 8 2 3
2 9 7
7 2 3 4 5
Hard #2
1 4 6 2
2 9 5 3
6 3 4
8 7 1 9
9 2 5
9 1 2
1 8
2 4 5
8 4 5
Hard #3
2 1 9
4 9 7 5
5 9 3 6 7 4
4 5 8 1
8
1 9 4 3
5 6 2
1 3
2 1
Hard #4
5 6 2 9 1
3 8
1 4
7 1 6 8 5
6 2 5
3 8 1 6
5 7 1 9
7 2 4
2
Hard #5
5 8 4 2
1 5
4 6 1 8
7 3 8
4 2 9
8 5 2
4 2 9
2 8 9 3
1 8 7
Hard #6
1 5 4 6
2 8 4
7 3 2 1 8
3 4 5
5 2 7
9 8 7
5 7
7 1 8
3 5 2
Hard #7
9 4
2 1 8 6
1 8 5
5 9
2 7 9 8 1
4 2 3 5
2 1 4
4 6 7
7 8 2
Hard #8
1
9 5 4 8 1
2 6 4
3 5 7 2
4 3 9
1 5
4 5 9 1
1 8 7 2
7 2 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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