I'm getting addicted to sudoku.

Last night I visited a bookstore and bought 2 identical copies of advanced level sudoku puzzle books, and gave a copy to the security guard who taught me how to play it. We're going to see who completes all the puzzles in the book first (and there are 280 puzzles!). lol. I stayed up till 2am this morning so I could finish a few. Today while working on a sudoku puzzle in the MTR subway train, an Australian beside me started a conversation because he was working on a sudoku puzzle too.

Can't wait to polish off a few more this weekend!