Best Kakuro Demo

Kakuro, also known as Cross Sums, is a challenging number puzzle, solved in a crossword style grid. The rules are easy to learn : A number above the diagonal line in a black square is the sum of the white squares to the right of it. A number below the diagonal line is the sum of the white squares in the sequence below it. For regular kakuro puzzles, you may only use the digits 1 to 9, and a digit can only be used once in any sequence.