Normal sudoku rules apply. Shade the grid according to the following rules: all odd digits are 'water' and should be unshaded; all even digits must be shaded to form islands; all water cells must be orthogonally connected but there cannot be any 2x2 areas of water. An island is formed of orthogonally connected cells. Islands cannot touch each other orthogonally but they can touch diagonally. Digits may repeat on an island. A cage cell is representing the leftmost cell in the top row of an island and the clue of the cage cell is equal to the sum of digits of the island. Not necessarily all cage cells are given.