Sunday puzzles: nurikabe
Puzzle 1
1223 Nurikabe 1010 BdL 15-11-15
Shade some empty cells black so that the grid is divided into white areas, each containing exactly one number and with an area in cells equal to the value of that number. Two white areas may only touch diagonally. All black cells must be connected with each other, but no 2 x 2 square of cells can be entirely shaded black.