Daily Killer Sudoku September 21, 2026
The same puzzle everyone got on September 21, 2026 — deterministic, graded, and still playable.
| 7 | 14 | 6 | 12 | 12 | 13 | 8 | ||
| 13 | 15 | 215 | 12 | |||||
| 15 | 1 | |||||||
| 14 | 21 | 3 | ||||||
| 21 | 7 | 11 | 10 | 16 | 15 | |||
| 1 | 3 | |||||||
| 17 | 15 | 15 | 16 | 19 | ||||
| 13 | 10 | |||||||
| 7 | 21 | 2 |
What it takes to solve
Our grader solved this puzzle in 139 steps. Every technique it needed, in ladder order:
- Naked single× 58
- Hidden single× 21
- Cage combinations× 60
Difficulty on Stillgrid is graded by the hardest technique a puzzle actually requires — this one earns Medium. How the technique ladder works.
Stuck on a cage? The killer sudoku calculator lists every combination a sum can take.
Also on September 21, 2026: the daily classic.