Normal sudoku rules apply. Divide the grid into different areas such that orthogonally adjacent areas contain different numbers of cells. Every cell is part of exactly one area. Digits may not repeat within an area. Numbers in the top left corner of cells are clues. An area can contain no clue, one clue or more than one clue. All clues in an area must be identical and indicate the sum of the digits in that area. [NB It is possible for two adjacent areas to sum up to the same total, as long as their size is different.]