The rules of sumdoku will be familiar from killer sudoku. Place 1 - 6 once in each row, column and 3x2 box. In addition, ensure that the total in the coloured regions is that given at the start of that region. Note that you may need to use any of +,-,÷ and x in order to calculate the answers. As with killer sudoku, you must not repeat a number inside a coloured region.

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