This is a simple and pure Sudoku game, with a master level only, no additional features, all the puzzles are generated automatically, so the difficulty will be different. If you feel too difficult to solve the puzzle, you can start a new game or select the puzzles in Challenge solved by the others, will greatly shorten your puzzle-solving time.
You have three times for no solution error, that is, fill in the current cell the puzzle will be no solution, more than three times the score will be invalid. Be ware that no solution error is different from logic error, logic error is that according to the Sudoku rules the number can not be filled in the current cell, but not included in the three times no solution error. Choose a good time and make the best use of three opportunities for error, will make the puzzle much easier to be solved.
I developed this app for fun, your rate is my great honor, If you have any suggestions or questions please email me.
===Please do not cheat, once judged as cheating, your score will never appear in the rank list.===