iPhone app Sudoku Exercise

Do you like Sudoku? It will bring you a total fresh feeling.
Sudoku is a game to develop intelligence, can exercise your logical ability and then improve it.

Basic Rules:

This Sudoku has 4 levels, just choose a proper one for yourself to start the amazing journery!

The objective is to fill a 99 grid with digits so that each column, each row, and each of the nine 33 sub-grids that compose the grid contains all of the digits from 1 to 9.
No omission, no repeat.
Only logical ability needed, regardless of math calculation.
It is easy to play, a good way to excerice your brain due to the variety of the digital arrangement.,

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