Blacken some empty cells in a way that all black cells are connected horizontally and vertically and no 2x2-field is completely black. The numbers in the cells give hints on how to blacken the surrounding fields (even diagonally): The numbers give the number of directly connected black cells. Each number represents a group of horizontally or vertically adjacent cells; groups around a hint-cell have to be separated by at least one white cell. The order of the numbers is unimportant.
Invented by Serkan Yurekli (Turkey).