
Kurotto (from Japanese, literally "black units") is a logic puzzle published by Nikoli. 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 cannot be blacken.
- Black cells form orthogonally contiguous areas.
- A number in a circle indicates the total number of black cells in areas orthogonally neighbouring the circled cell.
- Cells with empty circles may have any number of black cells around them.
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