The name Sudoku is the Japanese abbreviation of a longer phrase,
"suji wa dokushin ni kagiru," meaning "the digits must remain single".|
The rules of the game are simple: you need to fill the partially filled
gamefield with digits(or colours), in such way that each row, column,
and region(3x3 subgrid) contains only one instance of each numeral.
The numerals in Sudoku puzzles are used for convenience; arithmetic
relationships between numerals are absolutely irrelevant. Any set of
distinct symbols will do; letters, shapes, or colours may be used
without altering the rules. Dell Magazines, the puzzle's
originator, has been using numerals for Number Place(another name for Su Doku)
in its magazines
since they first published it in 1979.
The attraction of the puzzle is that the completion rules are simple,
yet the line of reasoning required to reach the completion may be difficult.
Sudoku is recommended by some teachers as an exercise in logical reasoning.
The level of difficulty of the puzzles can be selected to suit the audience.
The puzzles are often available free from published sources and also may be
custom-generated using software.
Within the Su Doku grid you can navigate by using the joystick:
UP, DOWN, LEFT and RIGHT keys.
Using those keys you move the red selection square to the field that
you want to update.
Press a number key to update the selected field.
If You want to erase an entry you just press the zero-key.
Note that when you hit a number key the previous value of the selected
field is lost.
If you want to continue playing another time while in the
middle of a game you can click the Menu button and then Save to save
the actual game status.
When you start the application again next time you can click the Menu
button provided by the start screen and choose Load to continue playing
the last game you saved.