Sudoku : Classic draggable

Sudoku classic draggable logic puzzle game, 9*9 Sudoku free brain training game has 4 levels of playing:

1- Easy
2- Medium
3- Hard
4- PRO

Sudoku game has free mode of playing which mean no time and no move limit, in this mode player can play classic sudoku as in paper or in book, newspaper etc. hint can accept 1 number only with ability to go back or forward or reset game at anytime..