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0/81 correct · 0 filled
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
0
Win rate
0%
Streak
0
Pick a cell to start.
Killer Sudoku with real cages, sums, and zero starting digits
This is now a real Killer Sudoku: the board starts empty, each dotted cage shows a target sum, and you still have to respect classic Sudoku rules across every row, column, and 3x3 box.
How the cages work
Every cage carries a small sum label. The digits inside that cage must add up exactly to that total, and those digits cannot repeat inside the same cage.
Rule of 45 and combinations
The fastest progress usually comes from two ideas: checking which combinations fit a cage and using the rule of 45 when a set of cages covers a full row, column, or box.
Keep pushing
Want another serious board after this one? Jump straight into Under 20 Sudoku or go back to the classic expert route.