Printable Hard Sudoku

Set z22ir4. 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
3 5 2 1
7 9
9 2 6
2 9
5 4 1 7 2 3
3 6 2 1
3 5
8 5 4
9 7 5
Hard #2
7 6 3
8 7 2 1 5 6
8 4
8 2 6
9 2
9 4 8 1
9 7 8
4 7 6
3 9 5
Hard #3
9 8 3 2 4 1
3 6 9 2
8
7 1 4
2 5 8 9
9
8 5 2
1 6 5 9
9 3 1
Hard #4
3 4 6 1
8 5 1 4
9 7
1 9 7 6
8 5 4 2
6 7 2 3 9
4 8 3 7
3 2
Hard #5
5 3
4 2 3
3 1 4
2 8 6
7 2 8 3
6 1 3 7 9
1 2 5 7 8
6 4
8 7
Hard #6
6 5 3 2 1
7 6 9
1 6 5 3
5 7 2 4
6 1
9 6 7
2 8 5
2 3 1 5 4
Hard #7
6 9
7 5 4
2 8 9
9 1
9 4 2
6 3 9 7
3 2 6 7 5
8 7 2 6 1
5 7
Hard #8
7 3 1
5 2 4 9 3
2 6
9 8 1
4 3
2 9 6 4 8
7 5 3 2
5 2 4
1 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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