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Killer Sudoku
Read each cage sum, keep digits unique, and solve the full grid without any starting numbers.
Instant validation
Mark wrong placements as you enter them.
Reveal mistakes
Toggle visible mistake highlights when you want a cleanup pass.
Hints
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Win rate
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Streak
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Pick a cell to start.
Play a real Killer Sudoku board
This route opens a true Killer Sudoku: no starting digits, real cages with sums, and the full classic rule set still active across rows, columns, and boxes.
What makes it real
Every dotted cage shows a total, every digit inside the cage must add up to that sum, and digits cannot repeat inside the same cage.
How to make progress
Start with small cages, narrow the legal combinations, and use the Rule of 45 when several cages cover almost a full row, column, or box.
Need the rules first?
If you want the theory before the next board, jump to Killer Sudoku Rules or the full solving guide.