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There is an unwritten rule for making Kakuro puzzles that each clue must have at least two numbers that add up to it, since including only one number is mathematically trivial when solving Kakuro puzzles. At least one publisher [3] includes the constraint that a given combination of numbers can only be used once in each grid, but still markets ...
The four cells in the top right cage (totaling 15) can only include one of 1, 3, 7, or 9 (if at all) because of the presence of 1, 3, 7, and 9 in the top right hand nonet. If any one of 1, 3, 7, or 9 is present then this must be the lone square in the nonet below. Therefore, these 4 cells are one of 1+2+4+8 or 2+3+4+6.
The next World Puzzle Championship in 1993 featured a variant of Battleship that omitted some of the row and column numbers. Battleship was first published in Games magazine in 1993, the year after the first World Puzzle Championship. Other variants later emerged, including Hexagonal Battleship, 3D Battleship, and Diagonal Battleship. [3] [4]
As in Sudoku, the goal of each puzzle is to fill a grid with digits –– 1 through 4 for a 4×4 grid, 1 through 5 for a 5×5, 1 through 6 for a 6×6, etc. –– so that no digit appears more than once in any row or any column (a Latin square). Grids range in size from 3×3 to 9×9.
The official rules state that the game is played with teams of two players each. On each team's turn, they draw a card and choose a concept from there. Each card has three difficulty levels (blue, red and black) with three concepts each. The team then places a green question mark on the picture illustrating the main category of the concept.
If a 3 is in a corner, the two outside edges of that box can be filled in because otherwise the rule above would have to be broken. A 3 in a corner. If a 2 is in a corner, two lines must be going away from the 2 at the border. A 2 in a corner.
The following are the thirteen books that are available in the series. Guaranteed to Bend Your Brain (previously Murderous Maths) (1997), ISBN 0-439-01156-6 - (addition, subtraction, multiplication, division, percentages, powers, tessellation, Roman numerals, the development of the "10" and the place system, shortcomings of calculators, prime numbers, time - how the year and day got divided ...
2 Kakuro Combinations. 4 comments. 3 Too many links. 2 comments. 4 Arrow Numbers. 1 comment. 5 Change article title to Kakuro. 4 comments. 6 NP complete? 1 comment. 7 ...