Killer Sudoku Generator
Killer sudoku is sudoku with a twist: the 9 × 9 grid is split into irregular cages, and the small number in each cage's corner tells you the sum of the digits inside it. Fill the grid so every row, column and box contains 1–9 exactly once and every cage adds up — no repeats inside a cage. Three difficulty levels, solve on screen, and print or download as PDF with an answers option.
How to use the killer sudoku maker
Pick a difficulty and a fresh puzzle appears instantly — every puzzle is different, and each one has exactly one solution.
- Reading the clues: every dashed cage shows a small number in one corner — that's the sum the cage's digits must reach.
- Solving: start with the smallest cages — a two-cell cage marked 3 must be 1 and 2, a three-cell cage marked 6 must be 1, 2 and 3. Each cage's digits are always different.
- Solve on screen: click any cell and type a digit, or use the arrow keys to move between cells. Check highlights anything wrong.
- Printing: “Print / PDF” prints the blank puzzle with cages and sums — up to 2 per sheet. “Print Answers” prints the completed grid.
The rules of killer sudoku
- Fill every cell with a digit from 1 to 9.
- Every row, every column and every 3 × 3 box must contain 1 to 9 exactly once — normal sudoku rules.
- The digits inside each dashed cage must add up to the small number in the cage's corner.
- No digit may repeat inside a cage.
- There is exactly one solution, reachable by logic and simple arithmetic.
Frequently asked questions
What is killer sudoku?
Killer sudoku is a sudoku variant played on a 9×9 grid split into irregular cages — outlined groups of cells. Each cage shows a small number in one corner: the sum of the digits inside it. Fill the grid so every row, column and box contains 1 to 9 exactly once, and every cage's digits add up to its corner sum with no digit repeated inside a cage.
Is the killer sudoku puzzle generator free?
Yes. Every puzzle generator on this site is completely free and unlimited. There is no account, no sign-up and no watermark, and you can generate as many puzzles as you like.
What do the small numbers in the corners mean?
Each small number is the sum of the digits in its dashed cage. For example, a two-cell cage marked 3 must contain 1 and 2 in some order. Digits can never repeat inside a cage.
How do I print a killer sudoku puzzle or save it as a PDF?
Click “Print / PDF” to print the blank puzzle with its cages and sums, or “Print Answers” for the completed grid. In the print dialog choose “Save as PDF” to download a file. You can print up to 2 puzzles per sheet.