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CROSS SUM
In these puzzles, you are filling the white squares with digits 1 through 9
so that they add up to the sums shown in the black squares.
A black square will show one or two sums, separated by a diagonal line.
A sum that is above the diagonal is the total of the row of white squares to its right.
A sum that is below the diagonal is the total of the column of white squares beneath it.
There are no zeroes, and a digit can appear only once within a sum.
This usually reduces the number of possibilities to a few you can solve through trial and error.
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