Cool Sudoku Deluxe

Cool Sudoku is a puzzle game. Free

It is easy to learn but a challenge to master, puzzling players all over world.

There is really only one rule to Sudoku: Fill in the board so that the numbers 1 through 9 occur exactly once in each row, column, and 3x3 box. Your initial game board will consist of several numbers that are already placed. Those numbers cannot be changed. Your goal is to fill in the empty squares following the simple rule above.

Test your powers of observation and memory.
Fill it as fast as you can, challenge it！

Features,
***4 difficulty settings;
***Smart notes;
***Error checking;
***Hints;
***Nice Sound;
***Pretty UI;
***Share it with your friends.

Thank you for your support!