The objective of this game is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 subgrids that compose the grid contains all of the digits from 1 to 9.

HelloSudoku for beginners and advanced players. Whether you'd like to relax or keep mind active – pass your free time in a pleasant way! Get a small stimulating break or clear your head with sudoku. Take your favorite app with you wherever you go. Playing sudoku on mobile is as good as with a real pencil and paper.

There are a lot of sudoku games out there, but this one is different. It has simplicity at its core. You won't find page after page of complex settings. This is the classic brain puzzle game reimagined with a clean, minimalist, material design.

& Why Do HelloSudoku?
* Sudoku beginners can easily solve.
* You can concentrate solely on logic pools.
* Easy and comfortable interface

& Features
* 4 Levels : Easy, Normal, Hard, VeryHard
* Lookup System : Displays the cells associated with number. Green is a definite, yellow is a cell associated with a number.
* Guess System : The system suggests a solution. There are situations that can not help. [Undo] to solve it.
* Undo : Return to the previous situation.
* Bookmark : Press and hold the [Undo] button for 2 seconds to create a bookmark.
* Leaderboard
* Achievement
* Auto Save/Load : You can always stop and play when you want (no time limit).