Killer Sudoku Combo Generator

A killer sudoku is a type of Sudoku puzzle with an extra constraint. In addition to the usual Sudoku rule that each row, column and box must contain a set of the numbers 1 through 9, it adds a constraint that the sums of the numbers in some additional regions (shown as dashed boxes to the right) must match some given numbers. Solving a tough killer Sudoku typically requires knowing the combinations that sum to various targets. This calculator finds those combinations for you.

How to use it: pick a target sum and the number of cells in the cage. If any cells in the cage already have a digit in them, mark those as given below and only combinations that include them will be shown. If a digit can't appear (e.g. it's already used elsewhere in the row, column or box), mark it as excluded. You can also click any result to strike it out by hand.