The Kakuro is a mathematical puzzle in which you have to fill in all the gaps with numbers ranging from 1 to 9 to try to get the amount next to each row.
How to Play:
Basically you have to use logic to place the numbers but with the added difficulty that you can not repeat a number in the same row.
Game play:
It has several types of difficulty, each of these feature hundreds of levels and you can also save games, with various options such as undo, delete or display errors.