Insula: Nurikabe Puzzle

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Insula is a Nurikabe puzzle — also known as Islands in the Stream — for players who like unhurried, honest logic.

Every number marks an island of exactly that many cells. Every island holds exactly one number, and islands never touch horizontally or vertically. Everything else is sea: one connected ocean that nowhere forms a solid 2x2 block of water.

Never a guess

Every puzzle has exactly one solution, and every step of it can be reasoned out. Each board is verified by a solver that only uses techniques a person can follow and explain — so a puzzle that would need trial and error never ships. The hint button uses that same solver, which means a hint is always a move you could have found yourself, and it tells you which idea it used.

Learn it by playing it

Nurikabe does not explain itself the way most grid puzzles do: two of its rules are about the board as a whole. The walkthrough hands you real positions and asks for the one square that follows, then shows you why. No board in it was made up — each is a genuine puzzle stopped at the moment the idea it teaches becomes the forced next move.

All offline, no account

• 12 campaign chapters, 360 levels, from gentle openings to genuine work
• A daily puzzle, the same one for every player worldwide, with a gentle Monday and a demanding Sunday
• Endless mode in four difficulties: Easy, Medium, Hard, Expert

Measured in months, not streaks

Fill in every day of a calendar month and the month earns its own trophy. There is no streak to lose: a day you missed can still be filled in from the archive, so a week away from the game costs you nothing.

Built to be pleasant

• Warm Material 3 design, light and dark, following your system colours
• Completely offline — no account, no sign-in, no network needed
• Boards shaped for a phone held in one hand
• No countdowns you did not ask for and no interruptions

27 languages supported. No account required. Pure logic.