Addition should be called puzzle crossword version numbers
Addition is a puzzle that can be called a number of cross-word version.
Each one-digit number is placed in the mass of the white mass of 9 × 9.
A hint from the number that appears in the black mass
Let's expect the numbers into the white mass.
Number of black mass, which represents the sum of the numbers they line up to the right of the black mass, the sum of the numbers along the bottom of the black mass.
The problem is almost infinite play is generated automatically at random.