Sudoku is a relatively new puzzle. In its current form it was developed two decades ago by a Japanese publishing house. The word means "number single". The rules of the game are very easy:
There's a 9x9 box consisting of nine 3x3 boxes. You need to fill in the box so that every row, every column, and every 3x3 box contains the digits 1 through 9.
I do think it's interesting, but I do not understand the hype. Perhaps when one's absolutely bored, and in no mood to blog, one could attempt Sudoku! Anyway try it out once. It might take 5-10 minutes.
If you like to see the answer to the above puzzle, click here.
Update (May 23): Dion Church, a Telegraph sudoku enthusiast, has come up with 'the ultimate Sudoku', a 3-D version of Sudoku. It's called the Dion Cube. All the rules apply but now in three dimensions. Here's the first Telegraph Dion Cube.