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20ZL

Solo · FREE PLAY

Nurikabe

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Logic & numbers
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Game guide · 20ZL

Your guide to Nurikabe

Open Nurikabe, check the instructions and begin a round. Create one connected sea around numbered islands of exactly the stated size, without a 2×2 sea block. Keep the game area visible while you use its controls. Read the objective before making your first input. Choose a clear next step rather than rushing through the instructions.

Play ten compact 5×5 puzzles. Some boards begin with fixed shaded sea cells.

Something to practise

Locate the buttons and input area before beginning a long round. Use the on-screen labels to avoid an accidental restart. Notice the feedback after each input.

The purpose of your moves

Create one connected sea around numbered islands of exactly the stated size, without a 2×2 sea block. The feedback beside the game helps you follow the round. Keep the controls in easy reach.

Follow these playing steps

  1. Shade sea squares and leave islands white.
  2. Every island contains exactly one clue.
  3. Different islands cannot meet along an edge.
  4. Check puzzle verifies sizes, connectivity and forbidden sea blocks.

Getting comfortable with the controls

Click or tap squares or graph edges. Number boards include a digit pad. Undo reverses the previous change; Check puzzle validates the solution. Use the control method described here for this activity. Avoid pressing the same control repeatedly while a move is being processed.

One way to understand the rules

An island labelled 1 is already complete, so its edge neighbours must be sea. Apply the same reasoning to the position in your own round. Choose a deliberate next step.

Pay attention to this rule

Two numbered islands may not merge into one. Read the feedback to see why an action did not have the expected result. Locate the buttons and input area before beginning a long round. Use the on-screen labels to avoid an accidental restart.

Common questions

While reading the Guide, what is the goal of Nurikabe?

Here is the relevant explanation: Create one connected sea around numbered islands of exactly the stated size, without a 2×2 sea block.

For a quick reminder, how do I control Nurikabe?

Click or tap squares or graph edges. Number boards include a digit pad. Undo reverses the previous change; Check puzzle validates the solution.

For this browser game, what example helps explain Nurikabe?

Keep this in mind: An island labelled 1 is already complete, so its edge neighbours must be sea.

Before I begin, what should I watch out for in Nurikabe?

Here is the relevant explanation: Two numbered islands may not merge into one.

On this playing page, what format does Nurikabe offer?

The key detail is this: Play ten compact 5×5 puzzles. Some boards begin with fixed shaded sea cells.

As a new player, 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.

Before I begin, where should I start with Nurikabe?

The key detail is this: Shade sea squares and leave islands white.

Do I need an account or a payment for Nurikabe?

For clarity: No player account or payment is needed. Game scores are recreational results, not cash prizes.

For my first round, how can I find Nurikabe again?

Here is the relevant explanation: Use the Games list or save this game page in your browser bookmarks. The Guide is linked from the playing page.

Before I begin, how do I report an issue with Nurikabe?

Use the contact form and include the game name, browser, device and the actions that led to the issue. Do not send passwords or payment details.

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