Try One Stroke Free on iPhone
Infinite puzzles. Adaptive difficulty. No forced ads.
Two different takes on line puzzles. One respects your time. The other... has a lot of ads.
Updated March 2026
Fill Puzzle has a satisfying grid-fill mechanic and colorful visuals. One Stroke has infinite levels, adaptive difficulty, and — crucially — no forced ads. If you're tired of being interrupted every 3 levels, One Stroke is the answer.
| Feature | One Stroke | Fill Puzzle |
|---|---|---|
| Developer | CyberGame Limited | Flavor Games |
| Mechanic | Draw lines to flip tiles | Trace path to fill grid squares |
| Levels | Infinite (procedural) | ~500+ (hand-crafted) |
| Difficulty | Adaptive (real-time) | Fixed progression |
| Forced Ads | None | Frequent interstitials |
| Audio | Procedural (sine waves) | Standard effects |
| Haptic Feedback | ✓ | ✗ |
| Offline Play | 100% | Partial (ads need internet) |
| App Size | 14.5 MB | ~120 MB |
| Visual Style | Minimalist, neutral tones | Colorful, playful |
| Game Modes | Puzzle + Challenge | Standard only |
Let's address the elephant in the room. Fill Puzzle has aggressive advertising. Forced interstitial ads appear every few levels, sometimes with countdown timers. It disrupts flow, breaks immersion, and can make a 10-minute session feel like half ads, half puzzles.
One Stroke has zero forced ads. You only see an ad if you voluntarily choose to watch one to unlock a hint or revive. This single difference fundamentally changes the experience. When you play One Stroke, you play puzzles — not an ad delivery system.
Fill Puzzle has around 500+ hand-designed grid-fill levels. They're well-made, but like all finite level sets, you'll eventually run out. At that point, the game has nothing new to offer.
One Stroke generates every puzzle procedurally, guaranteeing infinite unique content. Combined with adaptive difficulty, the game continuously calibrates itself to your skill level. The result is a puzzle experience that literally never gets old.
The two games approach line puzzles differently. Fill Puzzle uses a grid-fill mechanic — you trace a path that fills every square. It's satisfying and visually rewarding when you see the grid fill up with color.
One Stroke uses a tile-flipping mechanic — your line flips tiles as it crosses them, and you need all tiles in the correct state. It's more abstract but arguably deeper, with parity logic adding a mathematical dimension that grid-filling lacks.
One Stroke is 14.5 MB. Fill Puzzle is roughly 120 MB — over 8x larger. One Stroke achieves this through procedural generation (both levels and audio are generated mathematically, not stored as files). If storage space matters to you, or you want faster installs, One Stroke wins decisively.
Fill Puzzle's colorful, playful visual style has its appeal. The grid-fill animation is satisfying, and the bright colors make each completed puzzle feel like a small celebration. If you prefer vibrant visuals over minimalism, Fill Puzzle delivers that. It also has more user reviews and a longer track record on the App Store.
One Stroke offers infinite levels, adaptive difficulty, procedural audio, and zero forced ads. Fill Puzzle has a satisfying grid-fill mechanic but shows frequent forced ads and has finite levels. For an uninterrupted, long-lasting experience, One Stroke is the better choice.
One Stroke has zero forced ads — you only see ads if you opt in for hints. Fill Puzzle shows frequent forced interstitial ads between levels, which is one of the most common complaints from players.
One Stroke works 100% offline since all content is procedurally generated on-device. Fill Puzzle's ad system requires internet connectivity, so some features may not work properly without a connection.
One Stroke is 14.5 MB vs Fill Puzzle's ~120 MB because One Stroke generates both its puzzles and audio procedurally using algorithms, rather than storing pre-made levels and audio files. It's a technical approach that results in infinite content in a tiny package.
Also read: One Stroke vs 1LINE →
Infinite puzzles. Adaptive difficulty. No forced ads.