Ninjo Sudoku |
Ninjo Sudoku X |

**Ninjo Sudoku is an extension
of the standard Sudoku Puzzle. It comprises 4 interlocking Sudoku Grids which
are dependant on each other. The puzzle is solved using the same logic as a
Sudoku Puzzle however it is important that the puzzle is solved as a whole and
not just as 4 individual puzzles. Ninjo Sudoku puzzles are available as Standard
puzzles or "X" puzzles where, additionally, all the digits 1-9 must
appear in the diagonals of each of the Sudoku Puzzles within the Ninjo Sudoku.
See the examples above. Ninjo and Ninjo X Sudoku are available in a range of
grades of difficulty, depending on the number of digits in the unsolved puzzle
grid.**

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