SolverSudoku app for iPhone and iPad

Sudoku is an interesting and addictive game. The objective is to fill a 9×9 grid with digits so that each column, each row, and each of the nine 3×3 sub-grids that compose the grid contains all of the digits from 1 to 9.
The puzzle setter provides a partially completed grid, which for a well-posed puzzle has a unique solution.
There are 3 levels (easy, medium, hard) in this version and each level has many digit patterns which are generated every time players reset the game.
Besides, this version also has the timer to calculate the finished time for each game.