The puzzle consists of the grid 9×9 and 3×3 box. In some regions, the numeral is given in the grid. The objective is to fill one digit in blank cells in each row and column contains the digit 1-9 without repeating number. So the word single number occurs from this puzzle.

* Generate unlimited new puzzles
* 5 levels of difficulty from very easy to very hard.
* Solve helper options (Scanning, Marking up and Analysing).
* Pause/Resume.
* Auto save.
* Unlimited hints.
* Timer challenge
* Statistics record.

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