Sudoku Challenge 2.0

Sudoku Challenge is a logic-based placement puzzle. The object of the puzzle is to enter a numerical digit from 1 through 9 in each cell of a 9-9 grid made up of 3-3 sub grids (called "regions"), starting with various digits given in some cells .Each row, column, and region must contain only one instance of each numeral. Completing the puzzle requires patience and logical ability.

Here there are some improvements for this game :
Newly Redesigned Interface
Billions of Puzzles to Solve
Five Levels of Difficulty
Music and Sound Effects
Recording of Best Times
Automatic Pencil Marks
Autosave On Exit
Replay Puzzles By Game Number