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Curious Cheetah

Killer Sudoku

Background

Despite its similarity to CalcuDoku, killer sudoku precedes it by a decade, having been developed in Japan and first appearing in the English-speaking world around 2005.

Puzzle and Goal

An unsolved puzzle consists of a basic sudoku grid (usually 9x9) with areas marked off. Each area contains a small numeric clue, while the normal sudoku clues are absent.
The goal is to fill the cells with a Latin square.

Rules

The solved grid must satisfy the following conditions:

Variants

In Gebietssummen, you can have the same digit twice in the same region.

Other Names

Addoku; Gebietssumme; Kikagaku Nampure; Samunamupure; Sum Number Place; Sum Sudoku; Sumdoku

Playable Online