Printable Hard Sudoku Puzzles
Six hard puzzles, verified by a solver to need exactly the techniques listed under each grid, with answer keys on a separate page. Prefer pencil marks and hints? Each puzzle is also playable online.
7
5
2
5
4
8
9
3
7
6
3
2
9
8
1
2
6
4
5
7
4
2
4
6
3
Needs: Naked Single, Hidden Single, Naked Pair, Omission, Naked Triplet, Hidden Pair, Hidden TripletPlay online →
7
9
7
1
4
5
8
1
7
4
9
8
4
5
7
1
3
6
6
6
3
4
1
2
3
Needs: Naked Single, Hidden Single, Naked Pair, Omission, Naked QuadPlay online →
2
7
5
6
7
3
9
3
5
4
6
4
6
1
1
8
3
2
5
7
1
5
8
4
Needs: Naked Single, Hidden Single, Naked Pair, Omission, Hidden Pair, Hidden QuadPlay online →
5
3
6
5
2
4
4
6
5
9
2
7
6
3
3
8
2
9
4
7
3
2
6
9
5
Needs: Naked Single, Hidden Single, Omission, Hidden Pair, Hidden TripletPlay online →
4
1
2
5
2
9
3
4
6
7
5
3
6
5
8
1
6
9
7
8
1
2
3
Needs: Naked Single, Hidden Single, Naked Pair, Naked Triplet, Naked QuadPlay online →
2
8
9
7
2
4
6
1
9
7
5
7
3
3
1
8
7
9
3
4
6
8
7
3
Needs: Naked Single, Hidden Single, Naked Pair, Omission, Hidden QuadPlay online →
Answer keys
8
4
7
6
3
1
9
2
5
2
6
1
5
9
4
7
8
3
9
3
5
8
2
7
6
4
1
3
2
6
4
8
9
1
5
7
5
1
4
7
6
3
2
9
8
7
8
9
1
5
2
3
6
4
1
9
2
3
4
5
8
7
6
6
5
3
9
7
8
4
1
2
4
7
8
2
1
6
5
3
9
4
1
6
5
2
7
8
3
9
7
8
3
6
1
9
4
5
2
9
2
5
8
3
4
6
1
7
5
7
2
4
6
3
1
9
8
6
9
4
1
5
8
7
2
3
1
3
8
7
9
2
5
4
6
3
5
1
2
7
6
9
8
4
8
6
9
3
4
1
2
7
5
2
4
7
9
8
5
3
6
1
1
4
8
3
2
9
6
7
5
6
2
5
7
4
1
3
8
9
3
9
7
8
6
5
1
4
2
9
8
3
5
7
2
4
6
1
4
7
2
6
1
3
9
5
8
5
1
6
9
8
4
2
3
7
8
6
4
1
9
7
5
2
3
2
5
9
4
3
8
7
1
6
7
3
1
2
5
6
8
9
4
8
5
3
6
2
4
1
9
7
1
6
9
7
5
8
2
4
3
4
7
2
1
9
3
8
6
5
9
2
7
5
8
6
3
1
4
3
1
6
4
7
9
5
2
8
5
8
4
3
1
2
6
7
9
2
4
5
8
6
7
9
3
1
7
9
1
2
3
5
4
8
6
6
3
8
9
4
1
7
5
2
3
4
8
1
9
6
7
5
2
5
2
9
7
3
8
6
1
4
6
7
1
5
4
2
9
3
8
1
8
2
4
7
9
3
6
5
7
5
3
6
8
1
2
4
9
4
9
6
3
2
5
8
7
1
8
1
5
2
6
3
4
9
7
9
6
7
8
1
4
5
2
3
2
3
4
9
5
7
1
8
6
9
5
8
7
2
4
1
6
3
3
6
4
8
1
9
5
7
2
2
1
7
6
3
5
4
9
8
6
2
1
9
8
3
7
5
4
8
7
5
4
6
2
9
3
1
4
3
9
1
5
7
2
8
6
7
9
2
3
4
6
8
1
5
1
4
3
5
9
8
6
2
7
5
8
6
2
7
1
3
4
9
Printable Hard Sudoku FAQ
- How do I print these hard Sudoku puzzles?
- Click the print button (or press Ctrl+P / Cmd+P) and use your browser's print dialog. Choose "Save as PDF" as the destination to download a PDF instead of printing on paper. The answer keys print on their own page so you can leave them out.
- Are these printable hard puzzles really hard?
- Yes, verifiably. Every puzzle is checked by a solver that records the exact techniques required, and these are rated Hard because of the hardest technique they need — not a guess or a star rating. Each puzzle lists its required techniques.
- Can I play these puzzles online instead?
- Every printable puzzle links to an online version with pencil marks, hints, and a timer — and the wider library has thousands more, organized by difficulty and by technique.