When looking for a Sudoku app, one expects a few things. They expect the app to do what it says - That is, play Sudoku. They also should expect the app not to distract them. Sudoku is a very thought intensive game, so a simple clean interface is best. The game should also have plenty of puzzles, with the ability to get more. Thankfully, OpenSudoku is all of those things.
Upon starting the app you will see a list of folders, each full of puzzles. The app comes with 90 puzzles, but right at the bottom of this list there's a button to guide you through downloading and installing 400 more puzzles from the Open Source Gnome-Sudoku Project. These are free, and easy to install. From there, the user interface continues to be intuitive. Select a folder, and you are presented a list of puzzles. Each puzzle is presented with a preview of how far in that puzzle you are on the left hand side, followed by some information on the right, including how long you've spent on each puzzle. Long Tap will let you play, edit a note about the puzzle overall, reset it, change the puzzle or get rid of it.
Once you begin or resume a game, you are displayed a very simple interface. A white background with a black grid. The preset numbers have a Grey background and aren't editable. Where OpenSudoku excels is the editor. Three Modes exist. Popup, Single Number, and Numpad Input. Each input mode has a note Editor as well. In Popup Mode, a small window is displayed over the puzzle when you select a cell, touch a number and the number goes into the box. Switch to the note tab, and touch the numbers you want to put a note in for. Single number edit mode lets you choose a single number at the bottom of the screen, then touch any cell to put the number into that cell. A toggle switch lets you do the same thing with notes. Numpad Input is exactly the opposite, instead of selecting a single number, select a single cell and touch any number and it goes into that cell, a toggle switch is also here for the note editing. When you successfully complete the puzzle, a popup box tells you how long you took. You can press back or home at any time to leave the puzzle and it automatically saves your progress.
There is also an easy to use puzzle editor, allowing you to create your own puzzles, it uses numpad mode, and lets you quickly input a puzzle, say, the daily puzzle from your local newspaper. Also included is an Import/Export function, so if you change phones you can save all your progress to the memory card, and move it to your new phone.
- Its Free
Its Open Source, If you're into that
The interface doesn't get in your way
It comes with 90 puzzles, and 400 more are available for free from the app its self
You can make your own puzzles
Only 650KB or so
- The 400 more puzzles aren't included in the application, they also don't enter the prefabricated difficulty folders when you install them
Overall, its a great application, its free, and it just works. Its simple, small, and does exactly what it should. You won't be disappointed.