Sagitta · Free in your browser
Sagitta: Masyu Puzzle
Yajilin: shade by the arrows, loop through the rest
One closed loop through every pearl. Pure logic — never guessing.
The rules
- Shade some cells, and draw one closed loop through every other cell — except the arrows.
- The loop runs from cell centre to cell centre, across and down, through every cell that is neither shaded nor an arrow.
- The loop never branches or crosses itself.
- Two shaded cells never sit side by side; corners may touch.
- An arrow says how many shaded cells lie in its direction, all the way to the edge.
- An arrow's own cell is neither shaded nor on the loop.
- Mistakes pointed out as you play: a branch, a loop through a shaded cell, two shaded cells side by side, an arrow that sees too many, and a loop closed while other lines lie outside it.
- Tap a cell's middle to shade it, again to mark it for the loop, again to clear it. Drag across cells to draw the loop; tap between two cells to cross that step out.
- Every puzzle here is solvable by reasoning alone. You never have to guess.
- Got it
How to play here
Three ways to play
Campaign
Chapters that start gently and bring in one new idea at a time.
Daily puzzle
A new board every day, the same for everyone. Solve every one in a month and that month's trophy is yours.
Endless
Keep going as long as you like, in Easy, Medium, Hard and Expert.
About the game
Sagitta 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.
Common questions
Is Sagitta free?
Yes. You can play here without paying and without an account. Ads keep the lights on.
Where is my progress saved?
In this browser, on this device. If you clear the site data, your progress goes with it. A free Solvarium account keeps it safe.
Does it work on a phone or tablet?
Yes. It runs in any current browser on phones, tablets and computers, and the board resizes to fit the screen.
Does every puzzle really have one solution?
Yes. Every board goes through a solver before it ships, and anything with more than one solution is thrown out.