A free program for Android, by gibatekpro.

Are you tired of trying to solve Sudoku puzzles? Do you find yourself always getting stuck on a certain or two? And, would you like to create your own Sudoku puzzle and make other people solve it instead? Well, you can hit all birds with one stone when you download and install the Sudoku Solver And Creator mobile application.

The way it works is pretty simple: in the solver mode, you only have to fill in the cells on the board accordingly with the clues you are given. Then, the app will work everything out itself and figure the puzzle out for you. On the other hand, it also lets you create your own puzzles by typing the values in and creating the pattern that has to be solved.