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The popularity of Kakuro in Japan is immense, second only to Sudoku among Nikoli's famed logic-puzzle offerings. [2] The canonical Kakuro puzzle is played in a grid of filled and barred cells, "black" and "white" respectively. Puzzles are usually 16×16 in size, although these dimensions can vary widely.
KwontomLoop - A free site with daily slitherlink puzzles varying in difficulty. Also includes a ranking system with other players. Conceptis puzzles: Slitherlink techniques - This site shows some advanced solving techniques. games.softpedia.com - Slitherlink downloadable game. This generates puzzle at various levels and dimensions.
Checking that, using clock arithmetic on those values in turn: 8+0=8; 8+4=2; 2+7=9; 9+4=3. So the clock total is 3, meaning that the actual total also ends in 3 (which we've seen that it does). Any odd number of houses (in this case, 1 nonet) always have an arithmetic total ending in 5 - so, the only 'outie' we could add to change that 5 to a 3 ...
Type inference [3] [4] Eight queens puzzle; Map coloring problem; Maximum cut problem [5] Sudoku, crosswords, futoshiki, Kakuro (Cross Sums), Numbrix/Hidato, Zebra Puzzle, and many other logic puzzles; These are often provided with tutorials of CP, ASP, Boolean SAT and SMT solvers. In the general case, constraint problems can be much harder ...
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).
Takuzu, also known as Binairo, is a logic puzzle involving placement of two symbols, often 1s and 0s, on a rectangular grid. The objective is to fill the grid with 1s and 0s, where there is an equal number of 1s and 0s in each row and column and no more than two of either number adjacent to each other.
A version lets the solver shoot at 3 positions in one turn. The answer is returned sorted by size. For instance: (1,2) - (3,6) - 6,4) => 420 means that one of the three coordinates hit is a ship size 4, another a ship size 2. One coordinate returned a miss.
Actually, there is a fundamental reason why Kakuro is not a linear programming problem: Linear programming restrictions always specify a convex polytop of vectors, whereas a set of answers to a specific Kakuro puzzle might not be convex: 1 2 4 5 - is a valid block 1 3 3 5 - is an invalid block 1 4 2 5 - is a valid block, the convexity fails.