# Ink Flow - One Line Puzzle — Quiet puzzles in a single line

> Quiet puzzles in a single line (iPhone/iPad app by 株式会社RHKT.)

- Source: https://appshunter.io/ios/app/ink-flow-one-line-puzzle/id6817591800 (this page in markdown: same URL + `.md`)
- Developer: [株式会社RHKT](https://appshunter.io/developer/6817591802)
- Category: Games, Entertainment, Family, Puzzle
- Price: Free with in-app purchases
- Age rating: 4+
- Requires: iOS 17.0 · 6 MB
- Languages: American English, French (France), German (Germany), Japanese, Korean, Brazilian Portuguese, Chinese (Simplified, China), European Spanish, Chinese (Traditional, Taiwan)
- Released: 2026-10-06
- Data updated: 2026-10-15

## What is Ink Flow?

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.

Free to play. The first 30 stages are free; the remaining 150 open with a single payment. The same purchase removes every ad and unlocks all six themes. There is no subscription. The purchase also lets you solve the days you missed, from the calendar.

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Ink Flow Full Unlock | $3.99 | one-time |


## Is Ink Flow safe?

Not enough ratings yet to assess Ink Flow.

## Is Ink Flow legit?

Ink Flow - One Line Puzzle has limited verification signals. The AppsHunter Legitimacy Score for Ink Flow is 50 out of 100 points across 7 verification signals from App Store and developer data.


## Version history (last 4 releases)

### 1.1.0 — 2026-10-13

New ways to keep playing.
- Seals: finish a stage without a hint to earn a vermilion seal
- Calendar: the days you solve Today's Line, month by month
- Titles: sixteen titles for the milestones along the way

### 1.0.2 — 2026-10-10

Minor improvements.

### 1.0.1 — 2026-10-07

小さな改善を行いました。
・トラッキングの確認画面が、条件によって表示されないことがあった問題を修正しました。
・購入が取り消された場合の配色の扱いを修正しました。
・クリア時の表示を整えました。

### 1.0 — 2026-10-06

No release notes.

## Related topics

[yibi](https://appshunter.io/ios/topics/yibi)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-10-15.*