Open Sudoku is a simple open source sudoku game. It's designed to be controlled both by finger and keyboard. It's preloaded with 90 puzzles in 3 difficulty levels, more puzzles can be downloaded from the web and it also allows you to enter your own puzzles.
You can install Open Sudoku via Google Play Store.
Current version of Open Sudoku is authored by Óscar García Amor.
The first version of Open Sudoku was developed by Roman Mašek and contributed by Vit Hnilica, Martin Sobola, Martin Helff and Diego Pierotto.
Having trouble with Open Sudoku? Fill an issue in https://github.com/ogarcia/opensudoku/issues or contact me vía opensudoku@moire.org and I'll help you sort it out.