Free Killer Sudoku Maker
Free Killer Sudoku Generator
Cage sums in place of most given digits — easy, medium, or hard
Updated Oct 31, 2026
Killer sudoku is sudoku crossed with arithmetic. The 9×9 grid still needs every row, column and 3×3 box to contain 1 to 9 exactly once, but in place of most of the starting digits you get dotted cages, each labelled with the total its cells must add up to. No digit repeats inside a cage. Pick a difficulty and a fresh puzzle with exactly one solution is ready, plus a printable PDF with the answer key. Good for solvers who have exhausted plain sudoku, for maths enrichment, and for puzzle books that need a harder tier.
Why use Puzzone
Cage Sums, One Solution
Every cage total is checked against a single valid grid, so the puzzle is always solvable by logic alone — no guessing, no ambiguity.
Three Difficulties
Easy to learn the cage technique, medium for regular solvers, hard when you want the 45-rule and cage-overlap deductions to matter.
Answer Key Included
The PDF carries the completed grid on its own page, so you can check your work or hand out solutions with a class set.
Unlimited and Free
Generate as many as you want with no account. Free puzzles are for personal and classroom use; Premium removes the watermark and adds commercial rights.
How it works
Choose Difficulty
Select easy, medium or hard. Difficulty controls how much the cage sums give away.
Get Your Puzzle
A fresh cage layout with a unique solution is ready the moment the page opens and is remade when you change the difficulty; New puzzle makes another.
Print or Export
Download the print-ready PDF with the puzzle and its answer key, or click New puzzle until you like the layout.
Frequently asked questions
The 1 to 9 rules for rows, columns and boxes are identical. What changes is the clues: instead of given digits you get cages with a target sum, and no digit may repeat within a cage. Most killer sudoku puzzles start with no given digits at all.