Sudoku - Wonderful upgrade app for iPhone and iPad

A digital puzzle game with several decades of history, 5 types of palaces, 3 kinds of difficult, suitable for all levels, the most ground - based Sudoku games.
To play a good Sudoku game, we must first understand its characteristics and requirements, and then apply some principles and techniques to the welfare of the game.
1. use the exclusion method to fill in a row or column that can determine the number.
2. a row or column with the least blank space
3., when applying the above two principles, we can fill in the rows and columns that can be determined and the least spaces. After that, other rows or columns have definite figures. We should fill in the blanks before the two principles.

The application of this technique is basically to fill in the number one by one, and do not need to try the possibility. There is only one answer. The key is to find out the breakthrough, and wish you good luck here.