Sudoku for scholars.
Probably everyone knows this beautiful logic game and its rules. For those that don't:
The playing field is a square of 9x9, divided into smaller squares, each with a side of 3 cells. Thus, the entire playing field consists of 81 cells. At the beginning of the game there already are some numbers filled in (from 1 to 9), called tips. From this the player it is required to fill the free cells with numbers from 1 to 9 so that in each line, in each column and in each small square of 3x3, each total would occur only once.

Features of this game:
* Many levels of difficulty. From the most simple to almost impossible.
* The ability to see the answer at any time.
* Ability to save the game.
* Decorated in the style of ancient, Japanese prints.
* Beautiful Japanese music.

This popular game certainly can brighten up boring evenings or just help you kill some time.