This is a mini-version of Sudoku. Each grid are to be filled with numbers .
Find the sum of the digits of the boxes shaded yellow.
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It is easy enough to realize that there is only one possible box that 1 , 2 , 3 and 4 could fit in that specific grid.
Therefore, the sum is 1 + 2 + 3 + 4 = 1 0 .