Unio: Masyu Puzzle

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Unio is a Masyu puzzle — a loop drawn through pearls — for players who like unhurried, honest logic.

There are no numbers anywhere. You draw one single closed loop through the grid, and it has to pass through every pearl on the board. At a white pearl the loop runs straight through and turns just before or just after it. At a black pearl the loop turns, and runs straight for at least one cell on both sides. That is the whole game.

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

Two pearls and two rules are quick to read and slow to see. The walkthrough hands you real positions and asks for the one segment 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.

Three ways to play, all offline

• 12 campaign chapters, 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.