THE PLAYBOOK · YUBOJIAGU
How to play Nurikabe
Nurikabe gives you a focused activity to play in your browser. Create one connected sea around numbered islands of exactly the stated size, without a 2×2 sea block. Choose a clear next step rather than rushing through the instructions. Check the rule that explains your first action. Keep the game area visible while you use its controls.
Play ten compact 5×5 puzzles. Some boards begin with fixed shaded sea cells.
Try a deliberate move
After a move, check what changed. Decide which rule explains the new state before acting again. Make the next step deliberately.
Your goal
Create one connected sea around numbered islands of exactly the stated size, without a 2×2 sea block. Read that aim before choosing your first action. The example below illustrates a decision.
Step by step
- Shade sea squares and leave islands white.
- Every island contains exactly one clue.
- Different islands cannot meet along an edge.
- Check puzzle verifies sizes, connectivity and forbidden sea blocks.
Controls
Click or tap squares or graph edges. Number boards include a digit pad. Undo reverses the previous change; Check puzzle validates the solution. A careful first action helps you become familiar with the layout. A new-round button replaces the current round.
A useful example
An island labelled 1 is already complete, so its edge neighbours must be sea. Compare this with the rule that governs the move. Notice the change in the playing area.
Watch out for this
Two numbered islands may not merge into one. Read the feedback to see why an action did not have the expected result. When a decision goes wrong, compare it with the common mistake described below. Start again only when you intend to leave the current round.
Common questions
While learning, what is the goal of Nurikabe?
The key detail is this: Create one connected sea around numbered islands of exactly the stated size, without a 2×2 sea block.
For this browser game, how do I control Nurikabe?
The key detail is this: Click or tap squares or graph edges. Number boards include a digit pad. Undo reverses the previous change; Check puzzle validates the solution.
Before I begin, what example helps explain Nurikabe?
For clarity: An island labelled 1 is already complete, so its edge neighbours must be sea.
When I return, what should I watch out for in Nurikabe?
Here is the relevant explanation: Two numbered islands may not merge into one.
When I return, what format does Nurikabe offer?
Keep this in mind: Play ten compact 5×5 puzzles. Some boards begin with fixed shaded sea cells.
For this browser game, which play mode does Nurikabe use?
For clarity: The mode on this page is Solo. Same-device play uses one screen; this game library does not provide internet matchmaking.
