Sea Walls
Flood the map with sea until every numbered island is exactly its size. The sea must flow as one body and never pool in a 2×2 block.
Play nowHow to play
Controls
TapKeyboard←→↑↓ Space- Tap a cell to flood it, again for land, again to clear.
- Each island holds as many cells as its number.
- Keys: arrows and Space.
About the game
Sea Walls is a calm logic puzzle, also known as Nurikabe. Every number on the map is an island, and it must end up with exactly that many land cells. Everything else becomes sea. The sea has to flow as one connected body, two islands may never touch, and no 2×2 block may be all water. Each map has a single answer that you can reach by reasoning alone.
Thirty-six maps grow from five by five to ten by ten. Mistakes light up the moment a rule breaks, undo is unlimited, and the hint does more than fill a cell: it highlights the cells that prove it, so you learn the trick behind every step.
Free to play in your browser. No download, no sign-up. Works on phones, tablets and computers. Your progress is saved on this device.
