Kakuro is a fun numbers game that works like a crossword puzzle. Just fill in the blanks with a number 1 through 9 so that the sum of each line equals the number of the clue. But there is one catch--in every answer set, no number can be used more than once. The rules are simple, but Kakuro is unexpectedly challenging, entertaining...and addictive. It includes 4 difficulty levels: Easy, Medium, Hard or Sinister. It also features 5 different beautiful Kakuro themes, quick & intuitive number entry, pencil notes, error checking and number hints, and timed and Relaxed modes. You can even print puzzles to take them whenever you go.