This is Sudoku. Sudoku? Yes, Sudoku.
Here is the definition in Wikipedia.
Sudoku is a logic-based number placement puzzle. The objective is to fill a 9×9 grid so that each column, each row, and each of the nine 3×3 boxes (also called blocks or regions) contains the digits from 1 to 9, only one time each (that is, exclusively). The puzzle setter provides a partially completed grid. The general way to solve the problem is when you insert a new number it should be unique in that particular region (blocks) and also in that particular row and column.
Had not played Sudoku for a long while. I re-picked it up thanks to Nintendo DS. After working, I sometimes feel my brain cells are dying. It is true. Only a few areas of cells are working since the work is truncated to pieces. Unless you work at a start-up, you will be just assigned to work on several pieces, not all of them. As time goes by, you become used to these pieces and not intend to learn the whole picture. Then, some unused cells start to hibernate. If you let these cells hibernate too long, then you lose them completely. Because they are dead.
It is what I am facing. I thereby start to develop many hobbies such as playing games, reading detective stories, and playing golf. Nothing works as much as Sudoku. I can sense that my brain cells embrace it quickly. Sudoku is such an intelligent invention.
I now play at least 3 puzzles from the below link everyday. Why? Because I don't want my brain cells hibernate :p http://www.websudoku.com/
