Su Doku is a crossword-type of game, but with numbers only. It's now becoming popular and is listed in some newspapers next to the daily crossword puzzles. The typical Su Doku puzzle has 9 3x3 grids which make up one big 9x9 grid. A few numbers are provided for you throughout the puzzle. The goal is to write in the numbers from 1 to 9 in each grid so that the numbers are not duplicated in each individual 3x3 grid, and also are not duplicated vertically or horizontally. That may sound a bit confusing, but I'm sure if you hit up Su Doku on Google or another search engine, you'll get an idea for the game.
I find it challenging and fun. You must use logical reasoning to solve it. Stuff like: if a 4 is there, then that means it can't be here. Since it can't be here, then it must be at this other place...ah, I'll write a 4 in there. Now that the 4 occupies that space, it means this space must be a 3 because it is the only other number not in that horizontal row. etc. etc.
Check it out. I think it's a great tool to learn logical reasoning, which is very useful as a foundation for sports betting and poker playing.
There are several books with Su Doku puzzles as well as in some daily newspapers. I don't know how much the books differ, but the one book I got is by Mark Huckvale. Here's the link on Amazon.
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