The Courier & Advertiser (Angus and Dundee)
Su oku
Fill in the grid in such a way that every row and column and every 3x3 box contains the numbers 1-9.
For Killer Sudoku, the normal rules of Sudoku apply. However, in addition, the digits in each inner shape (marked by dotted lines) must add up to the number in the top corner of the shape.