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Sudoku with extra help Colour Sudoku works the same way as any normal Sudoku, use the numbers 1-9 in each line, column and 9 square block only once, and from that only once on a square of the same colour (eg. number 1 can not be used on a red square twice). This variation not only looks attractive but the colours give extra help in finding a solution.
Variation with Letters and Symbols The Colour-Sudoku is also available with letters and symbols. The pattern of colours can be chosen.
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