A free program for Android, by SUD Inc..

With this free Sudoku app, you can keep your mind sharp and challenge your logic with Sudoku puzzles. The app comes with different game modes, including classic and quick Sudoku, so you can try out the difficulty level that suits you best.

If you’re looking to train your brain, you’ll love this Sudoku app. It has a great layout and graphic design that’ll make you feel right at home, and the gameplay is very easy to understand. Just tap the puzzle board, pick a number, and enter it. The number you enter will go into the grid at that spot, so you don’t need to worry about where to place the numbers.