Best Free Killer Sudoku

A 9×9 Sudoku with cage sums and no givens — hit every total with no repeats.

Empty: 0 · Conflicts: 0

There are no starting numbers. Click a cell and type 1–9. The small number in the corner of each dashed cage is the sum its cells must reach, and a digit can't repeat inside a cage. Normal Sudoku rules also apply: each row, column and 3×3 box holds 1–9 with no repeats.

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How to play

  1. Read the cage sums. Each dashed cage shows a target number in its corner — the sum its cells must reach, with no digit repeated inside the cage.
  2. Fill in the digits. Click a cell and type 1–9. Keep each row, column and 3×3 box free of repeats while you hit every cage total.
  3. Complete every cage. When the whole grid is filled, every line is repeat-free and every cage adds to its target, the puzzle is solved.

About Killer Sudoku

Killer Sudoku combines classic Sudoku with cross-sum arithmetic. The 9×9 grid is divided into dashed-outline cages, and the small number in the corner of each cage is the total its cells must add up to — with no digit repeated inside a cage. On top of that, all the usual Sudoku rules apply: every row, every column and every 3×3 box must contain 1 to 9 with no repeats. There are no given numbers to start; the cage sums are your only clues, so you solve by combining arithmetic with Sudoku logic. Every board is generated fresh from a valid solution. Difficulty controls the cage sizes — smaller cages on easy, larger ones on hard. No signup, no download, nothing uploaded.

Frequently asked questions

Fill the 9×9 grid with 1 to 9 so each row, column and 3×3 box has no repeats — exactly like Sudoku — while also making each dashed cage add up to the small target in its corner, with no digit repeated within a cage.

Killer Sudoku usually starts with no given numbers. Instead of clues, it has dashed cages with sum targets, so you solve using arithmetic on the cages combined with the standard Sudoku rules.

No. A digit can be used only once within a single cage, even if the cage spans more than one row, column or box. The same digit can of course appear in other cages.

Difficulty sets how large the cages can grow. Easy uses small cages of up to three cells, normal up to four and hard up to five. Larger cages give each sum more possible combinations.

Yes. Each board is generated from a fully valid Sudoku solution and the cage sums are derived from it, so a solution that satisfies every line and every cage always exists.

Completely free — no signup, no download and no paywall. It generates and runs entirely in your browser, and nothing is uploaded.

Yes. It runs in your browser, so Killer Sudoku works on phones and tablets as well as desktop — there is no app to install.

No. Killer Sudoku works with no signup at all; an optional free account only exists to unlock higher usage limits.

Usually just a few seconds for a typical file — Killer Sudoku starts working the moment you give it your input.

Your input is processed in memory and never stored, so nothing is left behind once you have your result.

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