Kakuro

For many years Japan’s most popular puzzle, Kakuro (aka Cross Sums, Kasan Kurosu and Tashizan Cross) can be likened to a ‘mathematical crossword’. We present the solver with a grid containing interlocking white squares and small number clues. Those clues represent the sum of the numbers that must appear in each block of white squares. The solver can only use the numbers 1 to 9 and cannot repeat a number within a block.

When attempting Kakuro, knowledge of the special combinations of numbers that make up certain sums is invaluable. For example, if the clue is 10 and the block consists of four white squares, then the numbers required are 1, 2, 3 and 4 – but not necessarily in that order! Logical deduction is part of the challenge. 

We can create Kakuro with different grid sizes and a range of difficulty levels, to suit the audience.