Sudoku

All you tetris-heads will probably enjoy this puzzle. They seem to be big in the UK right right now, but I've just found out about them recently. The ancient Japanese puzzle of Sudoku is simple, but can be elegantly complex at the same time. All you do is fill each square with a number such that each row, column, and block have the numbers 1-9. It's kinda like the crossword puzzle for those of us who are writenly and scrabbelly challanged.