Killer Sudoku
Choose your difficulty and start solving
What is Killer Sudoku?
Killer Sudoku combines the logic of traditional Sudoku with the arithmetic challenge of Kakuro. Also known as "Sum Sudoku" or "Addoku," this variant adds an extra layer of complexity that makes it one of the most popular Sudoku variations worldwide.
In Killer Sudoku, groups of cells called "cages" are outlined and must sum to a specific number. You must fill the grid following standard Sudoku rules while ensuring each cage adds up to its target sum, with no repeated digits within the same cage.
How to Play Killer Sudoku
Basic Rules:
- Fill each row, column, and 3x3 box with digits 1-9
- No repeated digits in rows, columns, or boxes
- Each cage must sum to its target number
- No repeated digits within the same cage
Strategy Tips:
- Start with small cages (2-3 cells)
- Look for unique combinations
- Use elimination techniques
- Consider cage intersections
Essential Killer Sudoku Combinations
2-Cell Cages
Sum 3: 1+2
Sum 4: 1+3
Sum 5: 1+4, 2+3
Sum 6: 1+5, 2+4
Sum 7: 1+6, 2+5, 3+4
3-Cell Cages
Sum 6: 1+2+3
Sum 7: 1+2+4
Sum 8: 1+2+5, 1+3+4
Sum 24: 7+8+9
Unique Combinations
2 cells = 3: only 1+2
2 cells = 4: only 1+3
2 cells = 16: only 7+9
2 cells = 17: only 8+9
