description Nurikabe Overview
Nurikabe asks solvers to divide a grid into numbered islands and a connected shaded sea. Originating in Japan, it has been published by Nikoli since 1991. Each unshaded island must contain exactly one numbered cell, and that number specifies its total area. Islands connect through shared edges and must remain separated from one another by shaded cells.
All shaded cells must form one continuous network through edge connections, with no completely shaded 2x2 square anywhere in the grid. These conditions turn small local decisions into questions about the whole board: completing an island can force part of the sea, while preserving the sea's connection can limit an island's growth. Nurikabe suits people who prefer visual and spatial deduction to arithmetic. The numbers describe sizes, so solving depends on shape and connectivity rather than calculation.
help Nurikabe FAQ
How do you play the Nurikabe logic puzzle?
In Nurikabe, solvers must shade cells on a grid to create "walls" (often representing water) while leaving unshaded "islands" that contain exactly one number. The number dictates the size of the island, and the walls must form a single continuous area without any 2x2 shaded squares.
Where did the Nurikabe puzzle originate?
The Nurikabe puzzle originated in Japan and was first introduced by the puzzle publisher Nikoli in 1991. The puzzle takes its name from a yokai, or spirit, in Japanese folklore that manifests as an invisible wall.
What are the specific rules regarding 2x2 squares in Nurikabe?
A core rule of Nurikabe is that you can never have a 2x2 block of entirely shaded (wall) cells anywhere on the grid. This rule ensures the walls remain river-like paths rather than large blocky sections.
What Japanese puzzle company popularized Nurikabe alongside Sudoku?
The Japanese company Nikoli is responsible for popularizing Nurikabe, alongside famous puzzles like Sudoku and Kakuro. Nikoli publishes these puzzles in magazines and books, heavily focusing on hand-crafted grids.
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