Nurikabe is a classic Japanese logic puzzle that asks you to partition a grid into black cells (the river) and white cells (the islands). Each numbered clue in the grid represents an island of exactly that many white cells. Your task is to determine which cells belong to which island, and which cells are the river, using the following rules: islands must have exactly as many cells as their number; no two islands can touch horizontally or vertically; and all river cells must form a single connected group with no 2×2 blocks.
Nurikabe is one of the most logically rich puzzle formats in existence. The constraints interact in subtle ways — a river cell you place to isolate one island might force a 2×2 violation across the board. The no-2×2 river rule is particularly powerful and experienced solvers use it aggressively to eliminate cell states early.
The game includes an automated validator that highlights violations in real time, making it possible to learn the rules by experimentation. The hint system (available at lower difficulty levels) points to the most productive next deduction rather than giving away a solution, so it functions as a teaching tool rather than a cheat.
At beginner level, puzzles are small with generous clue numbers, leaving few ambiguous cells. At Cyborg level, sparse clues on large grids require long chains of elimination logic before a single cell can be definitively coloured. These puzzles can take 30–60 minutes for even experienced solvers.
Nurikabe is relatively unknown outside Japan and dedicated puzzle communities, which makes it a hidden gem on Cliko Games. Players who discover it through search or recommendation tend to become long-term daily players — the daily puzzle streak is one of the most active on the platform.
From Beginner to Cyborg ☠ — seven difficulty levels grow with you. Change difficulty any time using the dropdown at the top of the page.
Play Nurikabe free online — no download required, no sign-up needed. Nurikabe is a browser-based Puzzle game you can play on any device, any time. Challenge yourself with 7 difficulty levels, compete on the daily leaderboard, and share your score to challenge friends directly.
The daily challenge resets every midnight — build your streak and beat your personal best. Every game is fully playable on desktop and mobile without any installs.