Printable Hard Sudoku

Set 4dt2t8. 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
2 1 8 7 9
3 5 6 2
9 5
3 1
6 1 7 4
5 8 4 9
1 2 3
4 3
3 5 9
Hard #2
4 5 2
6 7 1
8 9 5
1 2
3 9 7 1
2 3 9 4 8
2 3 9
9 5 2 7
8 1
Hard #3
5 3 8 4
2 9 5
5 8 3
8 7 4
7 1 4 6 2
9 6
4 6 9
8 6 5
6 1 4
Hard #4
8 3
1 7 6
1 6 9 2
6 7 1 4
3 2
8 5 1 2 9
9 4 8
2 7 5
3 8 9
Hard #5
6 8 9 3 5
8
2 1 9 6
1 8 7 4 9 6
3 7 5 1 2
2
6 7
3 8 6 5
4
Hard #6
1 4 2
7 2 9 5 3
3 7 9
4 7 8
2 6
5 1 2 9
3 2 4 1
9 1 5
4 7
Hard #7
4 2 3
8 4 5 9 1
9 4
5 8 1
6 8 4 3 2
9 8 5
6 4
7 2 8 4
9 2
Hard #8
8
1 9 5
1 7 6
3 2
2 3 5 8
7 1 2 3 6
9 5 2
9 7 8 3
5 2 7 4

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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