Kurotto (from Japanese, literally "black units") is a logic puzzle. The task consists of a grid, with circles in some cells; a circle may have a number inside or not. The task is to blacken some cells of a grid according to the following rules:
Cells with circles can not be blacken.
Black cells form orthogonally contiguous areas.
A number in a circle indicates the total number of black cells in areas orthogonally neighboring the circled cell.
Cells with empty circles may have any number of black cells around them.
Kurotto (from Japanese, literally "black units") is a logic puzzle.
Cells with circles can not be blacken.
Black cells form orthogonally contiguous areas.
A number in a circle indicates the total number of black cells in areas orthogonally neighboring the circled cell.
Cells with empty circles may have any number of black cells around them.