Stone Sudoku

Fill the grid with numbers in the logical world of Stone Sudoku! Get ready for amazing number placement in this game! Your task is to fill in all empty cells on the playing field with digits from 1 to 9, and you have to do it in such a way that in one column, one row and one mini block (3x3), no digit repeats. To do this you have one row with the main digits and one row with digits marked, which can be put to solve in special cases. To place a digit, simply drag it onto the playing field. To cancel the action press the back arrow, and to finish the game press the right arrow. Check the game solution only at the very end, when all the digits are placed in their places. Just one mistake can break the entire gameplay, and you will need to start the game again. Also note, that the game has neither hints, nor error right, nor any settings. All miscalculations have to do in your head and write down the correct answers. Check button can be pressed only at the very end, when you have carefully checked the solution a few times. The game is quite difficult, but real fans will like it.