Nurikabe
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How to play and about the game
How to play
- Each numbered island has exactly as many cells as its number.
- The black cells form one connected river with no 2×2 block.
- Two islands never touch along an edge.
Controls
Pick Black, White or Clear, then tap a cell. Keyboard: arrows move, 1 black, 0 white, Backspace clears, H hint, U undo.
About this game
A 30-level campaign on 5×5 to 9×9 boards, plus a daily puzzle. Every island holds exactly its number, the black river stays connected with no 2×2 block, and each level has one solution.
- 5–9 min
- Single player
- Levels
- 30, 5×5 to 9×9
- Solution
- Unique, solver-checked
- Help
- Hint, undo
Strategy and tips
Four steps from your first game of Nurikabe to expert play.
- First game
A 1 is one white cell, so every neighbour it has is black: four in the middle, fewer on an edge or corner.
- Getting better
A single cell between two numbers must be black. If it were white, it would join both islands.
- Confident
An island that already holds its full count is finished, so every cell touching it must be black.
- Expert
No four black cells may form a square. When three of them are already black, the fourth must belong to an island.
Common mistake Painting a cell black only because it looks empty. A wrong move is not applied and counts as a mistake; five end the attempt.
