Printable Hard practice grids
Empty grids with Killer cage sum clues at standard label corners (solve using rows, columns, boxes, cages). Each puzzle has one solution.
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| 5 | 1 | 4 | 2 | 6 | 3 |
| 6 | 2 | 3 | 1 | 5 | 4 |
| 3 | 4 | 1 | 6 | 2 | 5 |
| 2 | 5 | 6 | 4 | 3 | 1 |
| 1 | 3 | 2 | 5 | 4 | 6 |
| 4 | 6 | 5 | 3 | 1 | 2 |
| 5 | 6 | 2 | 1 | 4 | 3 |
| 3 | 7 | 11 | |||
| 1 | 2 | 8 | 12 | ||
| 10 | 10 | ||||
| 2 | 18 | ||||
| 14 | 6 | 1 |
About Hard printable puzzles
For experienced solvers who want a serious puzzle on paper. Fewer givens mean you'll use pencil marks (candidates), pairs, and triples. Great for commutes or quiet time. Every puzzle has exactly one solution.
How they're generated: Each puzzle is created on demand with exactly one solution. Difficulty is determined by how many numbers we leave in the grid. The same generator powers our online play and print pages. Printable beginner guide.
Target audience: Free for everyone—no sign-up, no app. Suitable for all ages: students, parents, teachers, and puzzle lovers. Use at home, in the classroom, or on the go. About ProPuz