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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.Description Crozz Sum (Kakuro), A simple Kakuro puzzle generator, written using Java Swing, License - GPL 3.0Each empty box can hold a single digit number 1 - 9. You can fill them all in logically from the clue boxes. The boxes with slashes in them are the clues. The lower of the numbers under a slash say what all the numbers in the column below it add up to. The upper of the numbers over a slash say what all the numbers in the row to the right of it add up to. You cannot reuse a number again in any particular row or column. A row with a single column in it takes its value from the clue box directly to the left of the single empty box. Rows that have more than one column in them have a clue that is the sum of all the boxes in that row - and remember: you can not use the same number twice in any row. A column with a single row in it takes its value from the clue box directly above of the single empty box. Columns that have more than one row in them have a clue that is the sum of all the boxes in that column - and remember that you can not use the same number twice in any column, either. Start with the smallest sized puzzles and increase the size as you 'get' how to work it out, a box at a time ....This type of 'Number Crossword' requires math skills ... where as "Nurikabe" requires you to place a certain number of contiguous blocks so that they are separate from all the other sets of blocks: and uses spatial skills.