Killer Sudoku is a fun sudoku variant puzzle. The rules are simple: ensure that the numbers 1 - 6 occur exactly once in each row, column and 3 x 2 rectangle. Each coloured shape must sum to the number stated, and you cannot repeat a number within a shape. If you are unsure, play the sample puzzle and view the solution to see how it works. Also we have some Killer Sudoku Tips from our sister site, The Puzzle Club, if you are stuck!
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