Nurikabe is a logic puzzle game where players determine whether each cell is part of an island or the sea, following specific rules: islands are formed by white cells, each containing one numbered cell indicating its size, while black cells represent the sea, all of which must be connected. Players must ensure no two islands are connected, and no 2x2 square of black cells exists.
Nurikabe
Nurikabe is played on a rectangular grid of cells. At the start, all cells are white and some contain a number. Horizontally or vertically connected white cells form islands. These cannot be connected to other islands!
The goal in Nurikabe is to determine for each cell whether it is part of an island (white dotted) or part of the sea (black), following these rules:
Our version of the Nurikabe puzzle game has three difficulties: Small, Medium and Large.
The best way to solve Nurikabe puzzles is to alternate between determining white cells and black cells. Once you determined a few black cells, this can lead to new information that helps to identify white cells, and vice versa.
Follow these tips to complete a Nurikabe puzzle:
You can play with the mouse or with the keyboard.
If you play using the mouse, you can select a cell by pressing it. Then select the number you want to fill in above the grid.
If you play using the keyboard, you can use the arrow keys to navigate through the grid. Press a number on your keyboard to fill it in. When playing with the keyboard you can use the following shortcuts: Undo (Z), Redo (Y), Reset (R), Save (S), Deselect (ESC), Erase cell (BACKSPACE).
The Nurikabe puzzle game was invented by Nikoli, a Japanese publisher specialized in logic puzzle games. The first Nurikabe puzzle appeared in March 1991 in a publication of Nikoli.
The puzzle is named after Nurikabe, a spirit of Japanese folklore that manifests as an invisible wall.
The Nurikabe game is sometimes also referred to as Cell Structure or Islands in the Stream, but Nurikabe remains the most widely adopted name.
Other logic puzzle games on our website are Kakuro, Suguru and Binairo.
Nurikabe can be played in all modern browsers, on all device types (desktop, tablet, mobile), and on all operating systems (Windows, macOS, Linux, Android, iOS, ...).
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