Shade the grid by standard Hitori rules using the pencil marks as clues. Use the shaded cells' pencil marks as clues to shade the grid by standard Akari rules. If a shaded cell contains a pencil mark greater than 4, it acts as a 0 for Akari. If a cell contains a light bulb and it's corner mark is not 8 or 9, its pencil mark can be placed in the grid as part of the solution. Shade the grid by standard Nurikabe rules using the placed numbers as clues. (The pencil marks on shaded "water" Nurikabe cells are no longer needed.) Solve the grid as a standard Killer Sudoku where the cages are the Nurikabe islands, and the sum of the digits in the cage equals to the sum of the corner pencil marks in that cage. (The previously placed numbers remain in the grid.) In the solved Killer Sudoku, place 2 stars in every row, column and 3 by 3 region according to standard Star Battle rules. Cells with 4 or 5 must not contain stars.