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Free Killer Sudoku Generator
Generate a Killer Sudoku at the level you want, then print it with its solution. No digit is given at the start: the sums of the dotted cages tell you everything, and every grid has a single solution.
Free tool, for personal use, one puzzle at a time. The PDF is a US Letter page with a small LogikLand footer.
What is a killer sudoku?
Killer Sudoku mixes Sudoku with a little addition. The usual rules apply to rows, columns and boxes, and each dotted cage adds up to the small number in its corner, with no digit repeated in the cage.
The level sets the size of the cages. Small cages leave few possible combinations, while large ones leave many, which is what makes the upper levels hard.
Free Killer Sudoku Generator: examples
How to play Killer Sudoku
- Fill the grid so that every row, every column and every 3 x 3 box contains the digits 1 to 9 exactly once. No digit is given at the start.
- The grid is divided into cages, outlined with dotted lines. The small number in a cage is the sum of its digits, and a digit cannot appear twice in the same cage.
- Tip: a row, a column or a box always adds up to 45. Every grid has a single solution.
How to start
Begin with two-square cages that have only one combination. A total of 3 can only be 1 and 2, a total of 4 can only be 1 and 3, a total of 16 can only be 7 and 9, and a total of 17 can only be 8 and 9.
The levels
| Level | What you get |
|---|---|
| Easy | small cages (up to 3 squares) |
| Medium | cages up to 4 squares |
| Hard | cages up to 5 squares |
| Expert | cages up to 6 squares, fewer cages |
Tips
- Remember that every row, column and box adds up to 45. Subtract the cages that fit inside a box to find the value of a square that sticks out.
- Write the possible combinations in small print beside a cage instead of guessing.
- Try Easy first, even if you know Sudoku well: reading cages takes a little practice.
Want to publish your own puzzle book?
This free tool makes one puzzle at a time, for personal use. With a LogikLand account, you can build a whole Killer Sudoku book as a PDF or an editable PPTX file. See how in the Killer Sudoku book guide.
Frequently asked questions
Is this killer sudoku generator free?
Yes. The tool is free and needs no account: choose a level, create the puzzle and download the PDF. The PDF carries a small LogikLand footer and is for personal use, at home or in a classroom.
Why are there no digits in the grid at the start?
In this Killer Sudoku, the cage sums replace the given digits. They hold enough information to leave a single solution.
Can a digit repeat inside a cage?
No. A digit cannot appear twice in the same cage, even when the squares are in different rows.
What changes between the levels?
Easy: small cages (up to 3 squares). Medium: cages up to 4 squares. Hard: cages up to 5 squares. Expert: cages up to 6 squares, fewer cages.
Can I make a whole book of these?
Yes, with a free LogikLand account: the Killer Sudoku book wizard makes many pages in one book, with the solutions at the end, as a PDF or an editable PPTX file. The FREE plan makes books of up to 50 pages, PRO up to 100 and EXPERT up to 200. The PRO and EXPERT plans include commercial rights.
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Last updated: November 2026