I hadn't played Sudoku until a few months ago. Since then, I usually have a book of puzzles pretty handy. I've mastered the medium level ones, and have completed several hard ones. (You know, those magazine-like game books that have three different difficulties and usually some extra challenges ...)
I've always liked puzzles (logic problems, crosswords, etc. ...), so I'm glad I took the time to figure this out. It's keeps my mind active without being overwhelming.
