Printable Hard Sudoku

Set 1i5btwx. 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
4 6 8 3 1
1 2 9
5 3 2
2 7 9 1
4 3
8 1 5 6
8 2
3 9 4
6 8 4
Hard #2
6 5 3 7
7 3 9
7 1 5
4 8 7
3 7 5
7 4 6 1
2 5 9
4 1 7 3
1 4
Hard #3
8 2 3 4 1
3 8 9 2
5 8
9 1
1 8 2 7
7 3
9 5 6
7 8 6 9
2 1 8
Hard #4
4 2 6
6 1 5
8 2 9 4 3
3 8 9 6 1 7
4 5
7 8
6 2 8 3 9
8 5 1
Hard #5
4 9 6 7 2
9 7 1 3
7 4 6
2
5 8 6 1
3 1 8 6
7 3
6 9 7
5 3 7
Hard #6
1 2 5 3
4 5 8 3 1
2 9
9 1 8 4
3 4 6
8 4 1
1 5 8 3
4 9 7 5
Hard #7
3 6 9
3 8 5 6
9 5 2 1
2 8 4
5 7 6
2 3 9
9 3 8
1 4 7 5
8 1
Hard #8
7 8 9
9 3
9 7 4 5
3 7 5
2 1 4
1 5 6
6 8 1 9 4 3
1 4 7 9 2

Answers are on the last page of the PDF.

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Techniques for hard puzzles

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