Sudoku: "I have never been a fan of crossword puzzles though I have used them as a means to escape boredom during long train journeys across Siberia or Australia. Now, I have found a perfect replacement and I use it even during the daily commute: Sudoku. Even though Sudoku has been around for a while and extremely popular in Japan, it gained worldwide appeal only this year and suddenly, you cannot go to a bookstore without seeing tons of books on it.
The puzzle consists of a 9x9 grid with nine 3x3 subgrids - three per row and column. The puzzle comes with a few of the 81 cells filled in with some numbers. The goal is to fill out the remaining provided each number appears only once per row, column or subgrid. This is based on logic reasoning alone and do not require any mathematical prowess. The numbers could well be replaced with symbols or alphabets. The puzzles are of varying difficulties. "
For an online version, click on the image. Be warned - it's very addictive. I picked up my Sudoku Masters Course and I have not been able to stop playing this stupid game.
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