The app is built directly very clearly and simply in the main menu. There are at the beginning of three, then four fields. New Game - (game continuation) - Statistics - Help
Once you click on a new game, you can choose a variant of the game. A total of eight different variants are available, so for all tastes of the player anything would be there. Moreover then, that you can choose from eight different levels of difficulty. From "very easy" to "nightmare".
In the game, everything is structured clearly. One chooses down a number of which you want to enter the field and then press in this field. As a small aids are the same numbers as the previously selected, outlined in color with yellow. In addition you can choose whether you want to set the number directly, or just as a small number, as a "tool" will register itself in the corner.
By pressing the menu button on the device, there are several options available.
Since there are tip. As the name suggests, the game is then a help which field, which number or what block you should investigate. So even if you've not white, help this little option. However, a tip is expected a few "seconds penalty" to the current time.
Another option is the "Calculate candidates" key. There, all possible numbers that could fit into a box, registered small on the field, almost like putting the number into sets itself as an aid. There are two more fields, even "hide candidates", whereby the little helpers numbers disappear, but in the background are still there and can be displayed again. And the "Delete candidates" wodruch the numbers are gone and can not be restored.
In the last field under Options are once again some ways. One can be solved the Sudoku, but this is calculated with a 45 minute penalty. Furthermore, you can also switch among options in the settings. There you can set which method of solution can be displayed as a tip. There you can deselect and countless variations, very extensive. In the settings to also still "general", "support" and can adapt "appearance". But it now to take anything that would really take hours.
But let's just say. You can really adjust every detail and customize at will, a really huge selection of configuration options.
In the main menu to start now, appears when you have started a game, but not finished, "Resume Game" the other window. There are all the games that have been started, but not completed, enumerated. The games are sorted by the variant and there again divided according to level of difficulty.
Should a match no longer need, it can be deleted without any problems with a long press on the respective game.
In the "Statistics" in the main menu can be all sorts of details about the game read. There are, for example, the overall statistics, can be read in the "Number of Games", the "Total Time", "Fastest Time" etc.. Furthermore, it is in the statistics then also played at any variant, in particular difficulty, everything listed. There are very comprehensive information, but is not urgently needed. So let's quite fun to know and interesting.
The game has never crashed, hung, or the like with me (Samsung Galaxy Note Android 4.0.4). Also, the battery consumption of the app is really excellent, you can play a long time without the battery to charge great at mobile phones / tablets with large screens of the battery decreases due course the display slightly faster than smaller models.
All in all, it was so far the best app I've found at Amazon. And also the other Sudoku games that I had from the Play Store from Google, could not keep up with this app.
To recommend any Sudoku fan only, best app for that!