Printable Hard Sudoku

Set 1ik7bko. 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
1 4 9 8 6
8 4 7 3
5 4
8 2 3 5
5 9
2 3 6
8 7
2 1
1 5 3 8 4
Hard #2
9
2 4 8
3 4 7 9
4 7 8 2
2 1 4 6
9 6 2 3
5
1 3 2
8 5 3 1 9
Hard #3
9 2 3 1
1 3
2 7 6 4 1
6
2 6 1 7 5
8 9
2 4 8 5
5 6 9 4
8 3
Hard #4
7 1 3
9 1 2
8 6 7
8 7 3
5 4 2 9
1 2 4 7
8 5 4
4 5
6 2 1 7
Hard #5
5 8
9
8 2 6 7
3 9 4 6
6 8 9 3
1 5 8
7 4
8 6 1 2
4 3 6 1 9
Hard #6
3 6 5 1
9 8
4 1 9 5
4 1 5 6 2
1 9 7
9 7 2
7 2 9 1
4
3 8 5
Hard #7
1 3 7 2
7 3 9
9 2 3 4 7
4 3 2
7
5 2 4 7
2 9 5
4 1
1 3 8 6
Hard #8
9 5
5 1 3 9
3 9 4
6 3 1 8 7
8 7
5 6 7 1 2
2 4
6 9 5
1 4 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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