Killer Sudoku
Learn Killer Sudoku combining Sudoku logic with Kakuro-style caged sum constraints. Master cage combinations, the 45 rule, and advanced techniques.
Objective
Follow all classic Sudoku rules while ensuring each dotted cage sums to its target number. No digit can repeat within a cage. This variant combines logical deduction with arithmetic skills.
Rules
Row Rule
Each horizontal row must contain all digits from 1 to 9 without repetition.
Column Rule
Each vertical column must contain all digits from 1 to 9 without repetition.
Box Rule
Each 3×3 box must contain all digits from 1 to 9 without repetition.
Cage Rule (NEW)
Numbers in each dotted cage must sum to the target number shown in the top-left corner. No digit can repeat within the same cage.
Solving Tips
- 1.
Learn common cage combinations: 3 in 2 cells = 1+2, 17 in 2 cells = 8+9, etc.
- 2.
Start with cages that have only a few possible number combinations.
- 3.
Use cage constraints to eliminate possibilities - they work together with row/column/box rules.
- 4.
Remember: no number can repeat within a cage, even if the cage spans multiple boxes.
Printable Killer Sudoku
Download today's free printable Killer Sudoku puzzle. Combine logic with arithmetic — cage sums add an extra challenge.
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Combine logic with arithmetic and challenge your mathematical puzzle-solving skills
