Printable Hard Sudoku

Set smv0vp. 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
8 7 4
9 2 1
8 3
1
5 7 9 2 1
2 4 7 5
4 6
3 6 4 9 7 8
3 8 1
Hard #2
2 5
1 4 9 2
6 7 5 1
2 9 7
7 9 2 1 8
4 8
1 7 4
2
2 5 1 3 9
Hard #3
7 4 2 9 5
6 2 8 4
5 7
3 8 6 5
9 8 3
6 3
9 2 6
8 3 7 9
9 8
Hard #4
4 6 2
1
1 6 9 4
6 2 4 9
7 4 8
4 3 1 5 7
3 9 8
5 2 7 1
8 7
Hard #5
9 2 4 5
1 4
7 3 8 5 2 6
3 6 8 7
1
9 6
3 8
9 7 4 2
4 1 5 3
Hard #6
8 9 1 6
2 3 5
6
8 9 7 4
1 3
1 7 5 4
7 9 3 2 6
2 5 4 7
1 8
Hard #7
9 4 2 1
5
8 6 3 2 9 1 4
5
4 9 8 1
9 5 6 3
1 5 8
3 6
7 9 1
Hard #8
7 4 9 1
3 6 2 4
8 3 6
3 7 5
8 2 3
6 1 9
9 2 3 5
4 7 8 2 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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