Treasure island

A map of little islands. Each number is a treasure chest. Flood the sea and every chest opens.

How to play

• Each number is a chest on an island with exactly that many sand squares, the chest included.
• Every island has exactly one chest.
• Islands never touch side by side. Corners are fine.
• All the sea is one piece: you can swim from any sea square to any other.
• The sea never fills a 2 by 2 block.
• Flood every sea square to finish. Sand squares can stay blank.
• A sea square on sand costs a heart. You have three. In relaxed mode there are no hearts, and rule breaks show up instead.

Controls

• Tap a square to flood it with sea. Tap again to clear it.
• Drag across squares to flood a whole stretch at once.
• Double tap or long press to drop a sand dot, or pick the Sand tool so every tap drops sand.
• With a keyboard, use the arrow keys to move, Space for sea, Enter for sand and Backspace to clear.
• Undo takes back your last move.

Tips

• A 1 is a whole island already, so every square beside it is sea.
• A square beside two different islands is always sea.
• Squares no chest can reach are sea.
• When three squares of a 2 by 2 block are sea, the fourth is sand.

Questions

Is it free?

Yes. Every daily puzzle is free, plus 10 levels a day.

What kind of puzzle is it?

A sea and islands logic puzzle, also known as Nurikabe. Every board has exactly one solution.

Do I ever need to guess?

No. Every board has one solution you can reach by logic, though the hardest ones ask you to think a few moves ahead. A hint always explains the next step.