Printable Hard Sudoku

Set 1y6ai78. 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 8 6 7 2 1
1 2 5
9 4 6
9
8 3 4
4 3 7 6 5
2 7
6 1 4 3 8
Hard #2
7 2 6
2 6 9
9 1
2
4 7 8 1
1 6 5 7
7 3 5
2 6 4 1 3
3 5 7 9
Hard #3
7 9 4 3
3 8 6 9
2 1 9 4 3
4 3
7 5 2
4 8 6
5 7
9 6 8 4
1 5
Hard #4
2 1 4 8 5
6 3
7 1
8 4 2 5
1 6 7
5
9 8 1
1 8 5 6
2 6 9 1 3
Hard #5
6 1 9 4 7
2
7 8 6
4 7 2 3
2 6 9
4 1
6 4 3
1 8 6 9
9 1 5 6
Hard #6
7
8 1 3
8 6 3 4
3 5 8 1
8 6 1 7 9 5
9 4
6 4 7
3 7 8 6
9 2
Hard #7
1 7
3 5 8 4
7 3 9
9 1 3 6 4 7
3
3 2 5
2 6
7 5 9 8
6 8 1 2
Hard #8
9 4 3 8
4 6
2 1 8 4 9
4 2 6
3 8
6 9 7
7 1
3 2 7 5 4
6 8 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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