Killer Sudoku

How to play Killer Sudoku

Play Killer Sudoku free online. Fill the grid so rows, columns, boxes and every dashed cage sum work out, with notes and a daily puzzle.

Select a cell and type a digit. Notes mode records candidates, and the cage total updates as you fill it.

Why players come back to Killer Sudoku

Every puzzle is checked for a unique solution before it is dealt, and the daily grid is the same one everyone else is solving.

Killer Sudoku strategy

Start from the cage sums with only one combination, such as a three-cell six or a two-cell seventeen, then use the rule that each block of nine sums to forty five.