Gopher Sudoku Puzzle

Just start easy! Truly train your brain to understand new sudoku puzzle logic without complication or the strain of looking at black and white grids. Start training by playing smaller sudoku puzzles and harness the power of color and your brain will make more logical decisions! And as you become a sudoku puzzle solving master, adjust your difficulty to hard for a break from the now too-easy sudoku puzzles from your sudoku infancy!
Features:
•Notes: When you find a Sudoku game is difficult, you can turn Notes feature to take notes as using real paper and pencil.
•Hint: Use Hint feature to tell you how to fill the next cell for the Sudoku number. （Ps：This feature also teaches you fast if you are not very good at Sudoku game. ）
•Undo: You can use Undo feature to undo the last step of the Sudoku game.

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