DAILY QUICK + FULL · EXACT-SAFE HINTS
Nurikabe
Grow every numbered island to its exact size, connect one Sea, and avoid 2×2 pools. Daily starts with a fast Quick board and a deeper Full board; Practice and Campaign stay one tap away.
ModeDaily · Quick 5×5
Decided0 / 49
Islands0 / 0
SeaNot started
RunClean · 0:00
Mark every non-clue cell as Sea or Island.
Campaign level jump
Sea segments0
2×2 pools0
Forced now0
ProofNot run
B Sea · W/I Island · Space cycle · arrows move · ⌘/Ctrl Z undo
Progress & recent solves
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How to play & solving strategy
Match island sizesEach numbered clue belongs to exactly one orthogonally connected Island containing that many cells.
Keep islands separateDifferent numbered islands may touch diagonally, but never by an edge.
Connect one SeaEvery Sea cell must form one orthogonally connected region.
Avoid Sea poolsNo 2×2 block may be entirely Sea.
Use local logic firstComplete islands close their borders; three Sea cells in a 2×2 force the fourth cell to stay Island; an incomplete island with one legal exit must grow there.
Ask for proof only when neededHint prefers named local deductions. If local rules are quiet, a constraint model can certify a cell shared by every valid completion.
Puzzle library & coverage
The local bank contains 67 original solver-verified sources across 5×5, 7×7, 9×9, 10×10 and 12×12. Campaign 160 uses 40 exact transformed starts in each of the mature 5×5, 7×7, 9×9 and 10×10 tiers. Long 12×12 remains a smaller specialist Practice tier rather than pretending to be a 40-level catalog.