Infact samurai with 2, 3, 4 overlapping grids are also fairly common, and occasionally one sees even larger puzzles published: perhaps with 10, 11 or even more overlapping grids!Īlso the overlap pattern can vary: as mentioned often grids simply share one box region, but they can share a lot more, and there are some types of samurai puzzles where the overlap is very extreme, such as the star sudoku - see the article on that particular puzzle for more information. Samurai sudoku puzzles typically have 5 overlapping grids, but this need not be the case. Typically with a samurai sudoku, grids will share a 3x3 box region, and it is often here that most fruit can be found - in terms of placements that can be made - as the cells are in regions in multiple puzzles and therefore their values may be restricted quite early on in the solve process by the values in the two shared grids. Indeed a samurai sudoku puzzle is sure to take longer to solve than a standard sudoku, but the process and rules are exactly the same, there are just a higher number of regions and there are other overlaps to consider. Samurai sudoku may appear a more daunting challenge than standard sudoku because the grid is much larger and there are many more numbers to place. The aim with samurai sudoku is to place the numbers from 1 - n exactly once in each region in each puzzle grid.Īs standard, a samurai puzzle contains 5 overlapping grids making an 'X' shape, and so the numbers are 1 - 9 to be placed once in each row, column, 3x3 box. It is, however, not seen massively often in print simply because it requires more space.
Samurai Sudoku is one of the most common sudoku variants.
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