Free special samurai sudoku puzzles of 4 grids to play online
60,000 special samurai sudoku puzzles to choose from

Unlike ordinary samurai sudoku puzzles which consist of five 9X9 sudoku grids with overlapping corners, our special samurai sudoku puzzles, with four 9x9 grids, offer central overlapping.

There are less grids to fill, but twice more cells shared with two grids. A new difficulty liable to interest people fond of ordinary samurai puzzle. See below: Peculiarities of special samurai sudoku puzzles.

The rules are the same as for a classic sudoku. You need to find by deduction nine different digits by row, column and area for each 9x9 grid.

Each of our puzzles has only one solution. All our puzzles are solvable by a sequence of logical reasoning. No multiple choice or unfounded hypothesis is necessary to reach any solution.

You have 60,000 puzzles presented in two forms and three levels.
 Forms: Symmetrical or asymmetrical.
 Levels: beginner, confirmed and expert.

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Forms:Symmetric      Asymmetric 

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Levels:  Button play.
(From 1 to 10,000)
Forms: Symmetric      Asymmetric 


Choice of puzzles: Our special samurai were designed and graded so that at the same level the higher the puzzle number, the more difficult the solution, with this nuance that in our classification, at equal levels and numbers, symmetrical puzzles are a little easier to solve than asymmetrical ones. Indeed, the symmetrical ones have an additional constraint - precisely to be symmetrical - so they have fewer empty squares to solve. Also note that the aspect of difficulty is subjective, because different solving techniques suit different people.

Why play special samurai sudoku? Special samurai sudoku is a variation of classic samurai sudoku. It allows veterans of samurai sudoku puzzles to find new visual configurations. The beginner and confirmed levels are solvable by logical deduction. Only the expert level requires you to pencil in the candidates if you cannot see the solution.

Levels of grids to play online:

• Puzzles "Beginner" are fully resolvable by "Inclusion" while accepting other methods.
• Puzzles "Confirmed" are fully resolvable by "Inclusion" and "Exclusion" while admitting to other methods.
• Puzzles "Expert" are solvable by "Inclusion", "Exclusion" and "Pairs exclusive".

For more details on these three methods for resolution, identical to the regular sudoku, see: General help.

Peculiarities of special samurai sudoku puzzles:

None of the four 9X9 grids of the special samurai sudoku puzzles can be solved separately. Indeed, some of the cells will only be solved through simultaneous deductive approach of two 9x9 grids.
The difficulty appears mainly at the beginning and middle of the game and disappears at the end.

Symmetrical and asymmetrical puzzles:

An special samourai sudoku puzzle is symmetrical when the squares that compose it are arranged equally around the center known as the center of symmetry. This is only esthetic and does not change the resolution mode of the grid. Indeed it is the puzzle that is symmetrical and not the solution. However, the advantage of non-symmetrical puzzles is that, having one less constraint, they allow the elaboration of more difficult problems.

• Symmetry: A simple problem.
• Asymmetry: A difficult problem.

Free reproduction:

All special samurai sudoku puzzles PDF of four grids offered on this site are created by the web site and these puzzles can be reproduced free on condition that the link to the web site appears on every reproduced page.

Special samourai sudoku puzzle.

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