 in a short time; human-style solvers can be employed by hand-crafting puzzlesmiths for their ability to rate the difficulty of a created puzzle and show the actual solving process their target audience can be expected to follow.Although typical Sudoku puzzles (with 9×9 grid and 3×3 regions) can be solved quickly by computer,the generalization to larger grids is known to be NP-complete. Various optimization methodshave been proposed for large grids.Details of computer solutions may be found on the page on the Algorithmics of Sudoku.Difficulty ratings[සංස්කරණය]සැකිල්ල:Unreferenced-sectionThe difficulty of a puzzle is based on the relevance and the positioning of the given numbers rather than their quantity. Surprisingly, the number of givens often does not reflect a puzzle's difficulty. Computer solvers can estimate the difficulty for a human to find the solution based on the complexity of the solving techniques required. Some online versions offer several difficulty levels.Mos