Killer Sudoku

Classic 9×9 Sudoku plus dotted cages — digits in each cage must sum to the clue, with no repeats inside a cage.

Grid 9 × 9 Difficulty Hard

Start from an empty grid. Cage sums are shown in the top-left of each region. See basic rules for more.

Customize

New puzzle

Difficulty

Builds a fresh Killer layout with new cage regions for the chosen level.

Quick recap

Standard Sudoku: each row, column, and 3×3 box uses 1–9 once.
Each dashed cage has a sum clue — digits inside must add to that total with no repeats.
You usually start with an empty grid; use cage sums and Sudoku logic together.

About this level

For experienced solvers — more cages and tighter sums. See Techniques.