Printable Hard Sudoku

Set 1098s4p. 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 7
3 2 6
6 4 9
2 1
7 9 3 6 4 5
8 2
4 7 9
9 3 4
9 5 3 6
Hard #2
7 2 3
9 2 4 1
4 3 6 9
1 7 9 8
3
7 3 4 6
6 9 2
2 7 3 4
9 8
Hard #3
4 2
9 7 5
1 2 5 9 6 3
5 6
8 4 9 3
6 3 4 1 8
2 8
2 7 5
1 6
Hard #4
6 8 7
9 1 7
7 2 9 6
6 3
9 3 5 2
2 6 7 8
1 6 7 4 3
2 9 6
9
Hard #5
7 2 5 6
9 1 4 6 7 2
3 1
8 6 1
7 6 2
9 5 3
7 1
4 3 5 8
8 2
Hard #6
4 9 1
7 2 6 8
2 5 6
8 3 5 2
7 1
1 9 6
3 4 8
8 9 5
4 5 8 6
Hard #7
1 5
4 1 6
9 7 2
2 1
5 2 6 7
1 9 8 5
9 7 1 4
6 3 8 5 7
3 9
Hard #8
5 3
6 5 1 3 4
4 8
2 5 3 4 6
9 3 8
8 9 3 7
5 9 7
2 5
8 6 3

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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