Nurikabe #65
Colour the grey cells of the grid black or white . The black cells divide the grid into areas of orthogonally contiguous white cells.The white areas must not touch each other orthogonally (but diagonally). A cell with a number is always white; to each white area belongs exactly one cell with a number. The number indicates how many cells form the white area.
The black cells must not cover an area of size 2x2 anywhere. All black cells must form a single orthogonally contiguous area.