Normal sudoku rules apply. Divide the grid into coloured regions, so that no two orthogonally adjacent regions have the same size (in terms of number of cells they contain). The regions must be rotationally symmetrical. Digits may not repeat in a region, and regions with a small number clue sum to the number indicated. (Not all number clues are given, and these number clues DON'T have to be in the top, leftmost cell of their region.)