How to play Sudoku

The Sudoku is played over 9x9 grid, in each row there are 9 slots, some of them are empty and need to be filled

Each row, column and “area” (3*3) should contain the numbers 1 to 9 however:

A number can appear only once on each row
A number can appear only once on each column
A number can appear only once on each area (3*3 slots)
The bottom line : A number should appear only once on row, column or area.

However above all the ultimate challenge behind it is doing it fast!
Apparently there are 6,670,903,752,021,072,936,960 possible games!
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