In the Kuroomasu puzzle, you need to place black marks in the boxes so that the following rules are observed:
- Black cells cannot touch each other (corners are allowed).
- All other cells must form a single continuous area
- The numbers indicate how many open cells are "visible" from it vertically and horizontally. Visibility ends with either a black square or headland. Cells with numbers, including the actual cell being counted, are also included in the scope.
To facilitate the solution, you can use marks with crosses, they do not affect the solution. With the help of the highlight, it is easy to understand what exactly is not being respected in the solution process. When all the numbers turn green and there are no red areas or black cells outlined in a red border on the board, this means the puzzle is completely solved.