Play Killer Sudoku Online Free

Play Killer Sudoku online for free. Combines classic Sudoku rules with arithmetic cages — digits in each cage must sum to the target. No digit repeats within a cage.

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🟢 Easy 🟡 Medium 🟠 Hard 🔴 Expert

How to Play Killer Sudoku

  1. Standard Sudoku rules: every row, column, and 3×3 box contains 1-9.
  2. Dotted cages show a target sum — digits inside must add up to it.
  3. No digit can repeat within a cage.
  4. Use both Sudoku logic and arithmetic to solve.
💡 Pro Tip
Look for cages where only one combination of digits works. A 2-cell cage summing to 3 must be {1,2}. A 2-cell cage summing to 17 must be {8,9}.

Frequently Asked Questions

What's the difference between Killer Sudoku and regular Sudoku?

Killer Sudoku adds arithmetic cages with sum targets. You still follow row/column/box rules, but cages replace the given digits as your starting information.

Can digits repeat in a Killer Sudoku cage?

No. Each digit in a cage must be unique, just like in a row, column, or box.

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