About Nurikabe
Classic Nurikabe becomes an Orenvalt tidal-archive rite: raise ivory sanctuary islands around numbered beacons while a living indigo flood moves between them.
Each beacon's number is the exact size of its island. Every island contains one beacon, the flood must remain one connected current, and no 2×2 area may be entirely flooded.
All 120 charts are open across six folios from gentle 5×5 lessons to 8×8 archive charts. Every chart is deterministic, distinct, exactly-one-solution enumerated, witness-replayed, and independently checked against all four rules during every build.
Each chart keeps a public top ten for fastest time, with the record holder's name on its library card and beside the active chart.
How to play
- Mark every undecided cell as either flood or island.
- A numbered island has exactly that many cells and exactly one beacon. Separate every island from every other island.
- Keep all flood cells connected and never make a solid 2×2 flood pool.
Controls
| Tap / left click | Cycle unknown, flood, and island |
|---|---|
| Drag | Paint several cells with the same mark |
| Right click | Cycle a cell backward |
| Arrow keys | Move between cells |
| Space / Enter / X | Mark flood, mark island, or clear |
| Z / R / Escape | Undo, restart, or open all charts |
All 120 charts are open, deterministic, uniquely solved, and witness-replayed. Named fastest-time records, completion, current practice chart, sound, and reduced-motion preference persist in this browser.
