sudoku

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Sudoku is a logical number puzzle.
The traditional Sudoku is a 9x9 puzzle grid made up with 81 cells. Complete the puzzle, so that each and every
row,
column and
3x3 region
contains the numbers 1 through 9 only once.
In cases where the solution isn't immediately obvious, you’re able to pencil possible candidates in a vacant cell.
By touching a vacant cell, you activate it. The candidates can be chosen by the numerical entry below and registered in a vacant cell by the button “enter”. You can use it multiple times.
Every candidate will be checked by pressing the button “check”. Every error will be marked and must be corrected. Just as the other buttons, you can use the button “check” multiple times.
There are 3 levels of difficulty. The level “easy” already contains 54 , the level “medium” 45 and the level “ hard” only 36 given candidates.
A started game can be saved and also continued when you restart the app.