Pro-Sudoku app for iPhone and iPad

Sudoku originally called Number Place is a logic-based, combinatorial number-placement puzzle. 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 (also called "boxes", "blocks", "regions", or "sub-squares") 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 2 levels (easy, hard) in this version and each level has many digit patterns which are generated every time players reset the game.
Besides, this version also support capability to detect and clear the conflict cells.