
Killer Sudoku Rules
Killer Sudoku is a delicious variant on the sudoku theme, that combines elements of the classic Sudoku game, blended with the skills needed to play another popular puzzle, Kakuro.
The rules are simple.
 For a 6 x 6 grid: As with standard sudoku, every row and column and 3 x 2 rectangle must contain the numbers 1 through 6 exactly once. If the grid is 9 x 9, then every row and column and 3 x 3 square must contain the numbers 1 through 9 exactly once.
 The grid is composed of shapes shaded in different colours. At the top left of each of those shapes is a number. This signifies the sum of the cells that make up that shape. Thus, if there is a shape composed of two cells with a '3' in the corner, the total of those cells is '3'. From that you can tell that the values of the cells must be '1' and '2' or '2' and '1'.
 It is not permitted to repeat a number in a shape. Thus if you have a sum of 8 across three cells, this cannot be '2', '4', '2' as the '2' is then repeated in the shape.
 You are not given any numbers placed in the grid to start you off unlike in normal sudoku; however you can work out every number with no guesswork but applying logic alone to reach the unique solution for each puzzle
 Now try our Sample Killer Sudoku Puzzle and use our online player to show your mistakes as you go along whilst you are learning.
 When you are confident you know how to play, why not challenge yourself to complete our Killer Sudoku puzzles listed below.
Killer Sudoku: Choose Your Puzzle




Easy

Medium

Tricky

Difficult

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