Range

Game Rules: Colour some squares black, so as to meet the following conditions: No two black squares are orthogonally adjacent. No group of white squares is separated from the rest of the grid by black squares. Each numbered cell can see precisely that many white squares in total by looking in all four orthogonal directions, counting itself. (Black squares block the view.) Left-click to colour a square black. Right-click to mark a square with a dot, if you know it should not be black.

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Game Controls

Game Information

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Shortcuts: Ctrl+S(Save) | Ctrl+O(Load)

Game Rules: Range

Free online Range puzzle - place black squares to control visible counts. Test logical reasoning and spatial analysis abilities. Perfect for complex constraint puzzle enthusiasts.

Also known as: Kuromasu / Kurodoko

Why play this puzzle

Range focuses on deducing which cells can see each other across rows and columns, often searched as Kuromasu / Kurodoko. It works well as a quick logic exercise, but also has enough depth for longer solving sessions with fresh generated boards.

The best way to solve this Logic Reasoning puzzle is to lean on visibility reasoning: confirm forced moves first, reduce the remaining possibilities, and let the full solution emerge step by step.

Colour some squares black, so as to meet the following conditions: No two black squares are orthogonally adjacent. No group of white squares is separated from the rest of the grid by black squares. Each numbered cell can see precisely that many white squares in total by looking in all four orthogonal directions, counting itself. (Black squares block the view.) Left-click to colour a square black. Right-click to mark a square with a dot, if you know it should not be black.