Ink Flow - One Line Puzzle

One line. Every cell.

There is only one rule. Start at the red dot, pass through every cell on the board exactly once, and finish on the ring. That is all.

Nothing hurries you. No timer, no lives, no notifications. Stop and think, trace back and start over — nobody minds.

Numbers, in order From stage 21, numbered cells appear. Pass them 1, 2, 3… in order while still covering every cell exactly once.

Squares and diamonds From stage 28 another rule joins in. A square must be passed straight through; a diamond must be turned on. Together they let you read the shape of the answer before you draw a single line.

180 stages From gentle 4×4 boards to 8×8 boards with real bite. Every stage has been checked to be solvable, and chosen so the solutions do not sprawl. No stage can be finished by scribbling.

Sound Each cell you pass raises the note by one step, so the pitch climbs as you solve. Behind it, an ambient loop that never breaks. Every sound was made from scratch for this app — you will not hear it anywhere else. Best with headphones.

Today's Line One puzzle a day, the same one for everyone. Solve it and the day is recorded; keep going and the streak builds.

Seals Finish a stage without a hint and it earns a vermilion seal. Can you stamp all 180? A reason to return to stages you have already solved.

Calendar and titles Every Today's Line you solve fills in a calendar, month by month. Finished chapters, seals collected, days in a row — sixteen titles mark the milestones.

Six themes Sumi, Ai, Koke, Sakura, Yoru, Okibi. From bright washi paper to deep midnight violet. Switch whenever you like.

Nothing interrupts the solving No ads sit on the board. Nothing cuts in while your finger is on the line.

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