I realize this isn't crossword related, but this week's killer sudoku is nonsense. For example, the middle box in the top row is comprised of three regions with sums 7, 11 and 13 plus one cell that is part of an 11 region. 7+11+13=31 which means that isolated cell must contain 13!
Similarly the bottom middle cell has 19, 16 and 14 + one cell; that would force -4 into that cell....