I came across this new Cross-Word Puzzle type of mind game on TV today. They were talking about the first U.S. Sodoku competition in NYU. (A demo game is attached below.) This puzzle is originated in Japan and imported into United States about five years ago. Apparently it has been gaining popularity and many major newspapers start to print this puzzle game, alone with the traditional Cross-Word Puzzles, on a daily basis. The rule is fairly simple:
Fill in the grid so that
(1) every row,
(2) every column, and
(3) every 3 x 3 box
contains the digits 1 through 9.
I actually found a Sudoku on Sunday's Financial Times and spent some time to solve the puzzle. It was actually pretty fun, just as any other brain teasers. If you have never done one before, give it a try. You may find it interesting.
(P.S. If you find the demo too easy, here is a more difficult one. Enjoy~~)