Printable Hard Sudoku

Set ztla4d. 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 7
2 8 4
3 6
3 1 2
7 3 4
6 4 5 1 7
7 6 8
1 8 9
2 9 5
Hard #2
2 7
9 5
8 5 1
5 2
8 5 1 7 3 4
2 3
4 5 3 1
9 6 7 2
7 3 5 9
Hard #3
4 5 3 9
9 4 7
5 1 8
3 9 8 5 4
5 9 2
4 6 7
4 5 7
7 4 1
8 2
Hard #4
3 9 1 8
1 6 4 2 5
5 3 1
2 9 5 7
7 9 1
4 1 2
6 2
2 4
3 8 9
Hard #5
4 9
9 3 5
3 8 6 5
2 3 8
8 7 1 3 9
9 7 8 4 6
5 9 2
1
1 5 3
Hard #6
4 7 2 6 3
1 2
8 1 9
2 7
4 7 3 5 8
5 9
3 7 6 9 8
1 4 9 5
1
Hard #7
8 5 3 9 4
4 1
8 6 5
8 2
1 5 8
6 8 2 3
2 6 1 7
7 1 3 4
1 9
Hard #8
9 7 8 4
7 9 8 3 1 5
3
8 6 3
2 9 5
4 3 7 6
7 1 3 2
1
8 1 5

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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