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History of the Kakuro

Kakuro (aka Cross Sums) is a very common type of logic puzzle that is often referred to as a mathematical transliteration of the crossword.

In principle, Kakuro puzzles are integer programming problems, and can be solved using matrix techniques, although they are typically solved by hand.

Kakuros are regular features in most, if not all, math-and-logic puzzle publications in the United States; Dell Magazines uses the Cross Sums name, which was formerly unique to them but is now in common use among various publishers (although some other names, such as Cross Addition, are still used).

In Japan, where the puzzle is called Kakro, its popularity is immense, second only to Sudoku among Nikoli's famed logic-puzzle offerings; in an international tapdance,Kappa reprints Nikoli Kakro in the United States, in GAMES Magazine under the name Cross Sums.

The Guardian in Britain began printing the puzzle under the name Kakuro in September 2005; since then many other British papers have followed suit and now also print daily puzzles.

All games come in free versions online. For over a decade players have enjoyed casino games, poker, board games, flash games etc - ever without wagering a penny. Now you can practice solving Kakuro puzzles on the net as well ... for instance right here on the site.

-- Taken from : Cross Sums Wikipedia entry

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