KAKURO一问?

數謎」（KAKURO）一詞，源自日文「加法」的簡稱，和英文字“cross”一字的日文發音，代表一種邏輯推理遊戲，不僅入門輕鬆，也能挑戰成為箇中好手。可以把KAKURO想成一般的「填字遊戲」，只是空格中需要填上的不是文字而是數字；在美國，要說「數謎」就是填數字遊戲，也不為過。

不過「數謎」的魅力還不僅於此；它可以與現在最火紅的數字推理遊戲「數獨」(SUDOKU)媲美，因為在線索區中不允許重複相同的數字，而且唯一能夠使用的數字也只有1到9。

就像數獨一樣，你不必是一個數學天才才有辦法解開「數謎」的答案；事實上，你根本不需要做任何算數，因為每一則謎題都已經包含了你在解謎時會用到的數字。

请问KAKURO是怎样来的？
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Kakuro - Introduction
Hot on the heels of Sudoku comes Kakuro. Think of them as the mathematical equivalent of crosswords. Also known as Cross Sums or Kakro in Japan they have recently come to the UK featuring in The Guardian newspaper.

A Kakuro consists of a playing area of filled and empty cells similar to a crossword puzzle. Some black cells contain a diagonal slash from top left to bottom right with numbers in them, called "the clues". A number in the top right corner relates to an "across" clue and one in the bottom left a "down" clue.

The object of a Kakuro is to insert digits from 1-9 into the white cells to total the clue associated with it. However no digit can be duplicated in an entry. For example the total 6 you could have 1 & 5, 2 & 4 but not 3 & 3. Sound simple? Be warned it gets hard and is as addictive as Sudoku.