What is Killer Sudoku?
Killer Sudoku is a logic puzzle where every row, column, and 3×3 box still uses digits 1–9 once, while dotted cages must add up to their clue totals.
KILLER SUDOKU GUIDE
Killer Sudoku Rules and Strategies
Killer Sudoku keeps the classic 9×9 Sudoku rule set, then adds cage sums that reward clean logic and careful arithmetic.
Core rules
- Fill the 9×9 grid so each row, column, and 3×3 box contains 1–9 exactly once.
- Every cage must add up to the small number shown in its corner.
- Digits cannot repeat inside a cage, even when the cage crosses boxes or rows.
Beginner strategy
- Start with cages that have very small or very large sums because their digit combinations are limited.
- Use classic Sudoku scanning after each cage deduction to reveal singles in rows, columns, and boxes.
- Write candidate sums lightly, then remove combinations as nearby rows and boxes become constrained.
Killer Sudoku Combination Calculator
Enter a cage size and target sum to list every legal combination of distinct digits. Exclude digits already ruled out by the row, column, box, or cage.
Play Killer Sudoku now
Hell Mode is Sudoku Hot’s Killer Sudoku board: every puzzle adds dotted cages with sum clues on top of classic rules, across five brutal tiers.
Killer Sudoku FAQ
What is the difference between Sudoku and Killer Sudoku?
Classic Sudoku uses row, column, and 3×3 box rules. Killer Sudoku keeps those rules and adds cage totals, so arithmetic becomes part of the logic.
Can digits repeat inside a Killer Sudoku cage?
No. A cage cannot contain repeated digits, even if the cells are in different rows, columns, or boxes.
Do I need to guess in Killer Sudoku?
A well-made Killer Sudoku puzzle can be solved with logic. Use cage combinations, classic Sudoku eliminations, and singles before guessing.