Printable Hard Sudoku

Set ycjkx2. 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
6 5 4 7
5 2 9 8
9 7 3 8
4 2 7
6 4 5
2 9 4 6
4 1 2 8
3
8 6
Hard #2
3 9
6 9 7 1
7 8 6
4 9 1
9 8
3 4 2
9 8 2
6 4 7 3 9
5 2 1 3
Hard #3
7 2 8
1 6 3 5
9 5 8 6
3 8 2
8 1 6 9
1 2 9 5
6 7 2
9 8
2 6
Hard #4
4 3 5 7 9 8
5 6 1
2 4
6 8 3 9
9 3 7
2 1 4
1 4
6 5 1
5 7 3
Hard #5
2 7 5
1 7 5 6 8
9 7 1
1
7 6 8 9
5 7 6
3 5
5 1 9 8
8 9 3 4
Hard #6
2 1 4
6 8 1 5
5 9 3 7
8 3 2
4 5
9 7 8 1
3 2 1 6
6 3 1
8 4
Hard #7
1 6 9
2 5 4 7
7 2 9 3
6 3 4
5 9 7 6 3
8
6 9 8 7
1 8
5 2 4
Hard #8
7 2
1 5 2 8 7
6 5 4
3 5
3 1 4 9
8 1 4
2 3 5 8
9 4 6 7
2 9

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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