By Lson Lee · Indie developer & puzzle game enthusiast
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7 Best One-Stroke Puzzle Games
for iPhone (2026)

We tested every major one-stroke game on iOS. Here's how they stack up.

Updated March 2026 · 8 min read

Independent rankingSee methodology

One-stroke puzzles (also called Euler path puzzles, line puzzles, or "一笔画") are one of the oldest puzzle types in mathematics, dating back to Euler's Seven Bridges of Königsberg in 1736. On the App Store, there are dozens of games based on this concept — but quality varies wildly.

We downloaded and tested every notable one-stroke game on iOS. Here are the 7 best, ranked by gameplay depth, ad intrusiveness, level design, and overall polish.

Rankings on this site are based on the criteria documented on the methodology page: replayability, ad experience, difficulty design, offline usefulness, sensory feel, and respect for player time.
#1Editor's Pick

One Stroke: Line Puzzle Game

By CyberGame Limited · Free · 14.5 MB · iOS 16+

One Stroke is a different breed of puzzle game. While most competitors offer a fixed set of hand-crafted levels, One Stroke generates infinite puzzles procedurally — and every single one is mathematically guaranteed to be solvable.

The adaptive difficulty system adjusts to your skill in real time, keeping you in a flow state. The procedural audio — every sound synthesized from sine waves, no audio files — is a technical achievement unique to this game. Add haptic feedback on every tile interaction, and you have the most immersive one-stroke experience on iOS.

Most importantly: zero forced ads. You only see an ad if you choose to watch one for a hint. In a category plagued by aggressive ad models, this alone is a reason to choose One Stroke.

Levels
Infinite
Ads
None forced
Offline
Yes
Unique Feature
Procedural audio
Download One Stroke on the App StoreFree download
#2

1LINE — One-Stroke Puzzle Game

By GAMINCAT · Free with ads

1LINE is the established veteran of the category, with a large user base and thousands of reviews. The puzzle design is solid — clean dot-and-line visuals, satisfying connections, and a good variety of shapes from simple triangles to complex geometric patterns.

The main limitation is finite hand-crafted levels. Once you complete them, the game is essentially over. There's no adaptive difficulty — early levels feel trivially easy, and difficulty spikes can feel arbitrary. Interstitial ads appear between levels.

Levels
~750+
Ads
Interstitial
Offline
Yes
Unique Feature
Large level library

Read full comparison: One Stroke vs 1LINE →

#3

Fill Puzzle — One Line Game

By Flavor Games · Free with ads

Fill Puzzle takes a grid-filling approach to one-stroke puzzles. Instead of connecting dots, you fill squares by tracing a continuous path. The visual style is colorful and polished, with satisfying fill animations.

The downside: aggressive advertising. Forced interstitial ads appear frequently between levels, disrupting flow. The level design becomes repetitive in later stages. No adaptive difficulty means you'll spend time on puzzles that are either too easy or unreasonably hard.

Levels
~500+
Ads
Frequent forced
Offline
Partial
Unique Feature
Grid-fill mechanic

Read full comparison: One Stroke vs Fill Puzzle →

#4

One Line: Drawing Puzzle Game

Free with ads

A clean, minimal one-stroke game with a focus on geometric shapes. Good visual design and smooth line drawing. Limited level count and no adaptive difficulty. Ads between levels. A solid choice if you want a simple, no-frills experience, but it doesn't push the boundaries of the genre.

#5

Puzzle Glow: One Line

Free with ads

Stands out visually with a neon glow aesthetic on dark backgrounds. The visual theme is distinctive, and the puzzles are well-designed. However, the neon style can strain eyes during long sessions. Ads are present but less aggressive than Fill Puzzle. Good variety in puzzle shapes.

#6

One Stroke Drawing

Free with ads

A straightforward, back-to-basics one-stroke game. No flashy features, just dot-and-line puzzles. The level design is decent but uninspired. Works well as a lightweight time-passer but doesn't offer the depth or innovation of the top picks.

#7

Line Puzzle: String Art

Free with ads

Takes the one-stroke concept in a creative direction with string art visuals. You connect pins with string to create patterns. Beautiful results, but the puzzle logic is less rigorous than pure one-stroke games. Fun for visual creativity, less so for logical challenge.

Full Comparison Table

Side-by-side feature comparison of all 7 games

FeatureOne Stroke1LINEFill PuzzleOne Line
PriceFreeFreeFreeFree
LevelsInfinite~750+~500+~300+
Adaptive Difficulty✓✗✗✗
Forced AdsNoneBetween levelsFrequentBetween levels
Procedural Audio✓✗✗✗
Haptic Feedback✓✗✗✗
Offline✓✓Partial✓
Hint System3-tierSingle hintSingle hintSingle hint
App Size14.5 MB~80 MB~120 MB~60 MB

Frequently Asked Questions

What is the best one-stroke puzzle game for iPhone in 2026?

One Stroke by CyberGame Limited is our top pick. It's the only game in the category with infinite procedurally generated levels, adaptive difficulty, and procedural audio — all while being free with no forced ads.

What is the difference between One Stroke and 1LINE?

1LINE has hand-designed levels that eventually run out (~750+), while One Stroke has infinite procedurally generated levels. One Stroke also features adaptive difficulty that adjusts to your skill, and unique procedural audio. 1LINE shows interstitial ads between levels; One Stroke has no forced ads.

Are there any one-stroke games without ads?

One Stroke by CyberGame Limited has no forced ads — ads only appear if you choose to watch one for a hint. Most other games in the category show forced interstitial or banner ads between levels.

What is the smallest one-stroke game for iPhone?

One Stroke is just 14.5 MB — significantly smaller than competitors like Fill Puzzle (~120 MB) or 1LINE (~80 MB). This is partly because all audio is procedurally generated rather than stored as audio files.

Related Topics

One Stroke vs 1LINE

One Stroke vs Line Drawing

One Stroke vs Flow Free

Best Games Without Ads

Try One Stroke Free on iPhone

Infinite puzzles. Adaptive difficulty. No forced ads.

Download on the App Store
Download on the App Store