Mirrored from **Sudopedia**, the Free Sudoku Reference Guide

# Killer

Example Killer Sudoku puzzle.

Solution to the example puzzle.

**Killer Sudoku** is one of the most popular Sudoku variants. The Japanese name for Killer is **Samunamupure**, and it is also known as **Sum-Sudoku**.

The puzzle has no givens, but it has the same grid format as a standard Sudoku. This grid is covered by cages, each of which enclose 2 or more cells. The cages are usually marked with dotted outlines or with separate background colors. The top-left cell is labeled with a cage sum, which is the sum of all solution digits for the cells inside the cage. Unless otherwise stated, all Killer puzzles follow the Killer Convention: all digits in a cage should be distinct. In Killer nomenclature, the boxes are often referred to as nonets.

Besides the techniques that you can use for standard Sudoku, solving a Killer requires a whole new set of solving techniques. It is often useful to know the cage combinations for particular cage sums. As an example, a cage of 2 cells with a sum of 3 has only one possible combination: {12}. See this category for a list of Killer Sudoku techniques.

The Killer variant can be combined with the Jigsaw variant to form Jigsaw Killers. It can also be combined with Sudoku-X to form Killer-X.

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This page was last modified 07:43, 9 April 2010.