Group Sum Sudoku
Place a digit from 1 to 9 into each of the empty squares so that each digit appears exactly once in each of the rows, columns and the nine outlined 3x3 regions.Each number at the intersection of four cells is the sum of digits in those four cells.
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In order to get the best gaming experience on smart devices such as smartphones or ipads, the touch screen mode is preferred. On your PC, you can choose keyboard mode or touch screen mode according to your preference.