Sudoku?.

Sudoku, sometimes spelled Su Doku(sudoko,sodoku), is a placement puzzle, also known as Number Place in the United States.

There is only one rule for sudoku:
Fill in the grid so that every row, every column, and every 3x3 box contains the digits 1 thru 9.There is no math involved. Nothing has to add up to anything else. You solve the puzzle with logic and reasoning.

***Features***
- Challenge yourself figuring out your mistakes, or enable Auto-Check to see your mistakes as you go
- Turn on Pencil mode to make notes as on paper. Each time you fill in a cell, notes are automatically updated!
- Highlight duplicates to avoid repeating numbers in a row, column and block
- Hints can guide you through the points when you are stuck

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