Fiendish logic puzzle (Su doku)

[partygirluk]

Sudoku is a fun new logic puzzle that has started being produced in the papers over here, along with the daily crossword, bridge column etc.

There is a 9 by 9 grid make up of 9 3*3 squares. Each row, column and box must have the numbers 1-9 exactly once. Today's was a tough one.

9 - 1 : - - 2 : - - 3
- 8 - : - 4 - : 6 - -
- - 3 : - - 1 : - - -
______________________
- - - : 3 - - : 1 5 -
7 - - : - - - : - - 9
- 9 4 : - - 8 : - - -
______________________
- - - : 6 - - : 5 - -
- - 9 : - 7 - : - 3 -
4 - - : 2 - - : 8 - 7