Sudoku a kind of puzzle I first heard of when a former Japanese colleague bought me a Wordoku, the word version of Sudoku, from New York. Wordoku is rather complicated to me that made me give it up when I made my first try. Yesterday, while I was browsing in a book store to kill the time, I was a little bit surprised to learn that Sudoku puzzle books were available there. So I decided to make another challenge. I picked up the beginner one, and yeah it was much easier. I got absorbed in and solved it until 1 am last night. I got more than 10 pieces solved last night!!! Not so bad.