Sudoku is a mathematical game from Switzerland in eighteenth Century,It's a kind of logic game that uses paper and pen. According to the known number in 6×6 cells,Reasoning out all the remaining spaces numbers and let each row, each column, each sub-cell containing 1-6 numbers are not repeated.

*All levels are free!

Functions:
1. a total of more than 1000 levels
2. record your game level and total score
3. start your mind with the highest score