# Fill one-line puzzle game — one-line puzzle game > Free one-line brain training puzzle game with 2,000 levels. (iPhone/iPad app by GAMINCAT, INC..) - Source: https://appshunter.io/ios/app/fill-one-line-puzzle-game/id1091456207 (this page in markdown: same URL + `.md`) - Developer: [GAMINCAT, INC.](https://appshunter.io/developer/1647225978) - Category: Games, Entertainment, Puzzle, Trivia - Price: Free with in-app purchases - Rating: 4.60/5 from 39,816 App Store ratings · 371 written reviews indexed - Age rating: 17+ - Requires: iOS 12.0 · 140 MB - Languages: American English, French (France), German (Germany), Japanese, Korean, Chinese (Simplified, China), European Spanish, Chinese (Traditional, Taiwan) - Released: 2016-05-02 - Data updated: 2026-08-29 - Monetization: free with in-app purchases - User reviews in markdown: https://appshunter.io/ios/app/fill-one-line-puzzle-game/id1091456207/reviews.md ## What is Fill one? Sharpen your mind with a connect-the-block-style one-line brain training puzzle game. A simple but addictive one-line puzzle game that’s completely free to play. Your brain becomes more active the more you play. During your commute, before you sleep… enjoy downtime with brain training. The rules are extremely simple. Just fill in all of the blocks using only one line. Use hints for puzzles that are too hard to solve. Hints are also free, of course. 4 levels of difficulty. A whopping 2,000 puzzles. Don’t get too cozy—the puzzles get harder as you go along. One-line puzzles are mathematical problems with origins in the early 18th century. First posed in Königsberg, the original puzzle revolved around the town’s Pregel River. Mathematical thinking is said to increase work efficiency and prevent aging. Whether math is your bane or your forte, be sure to give this game a try. You’re sure to get hooked on these puzzles! ## Key features - Connect-the-block style puzzles - Fill all blocks with one line - 2,000 puzzles - 4 difficulty levels - Free hints available - Brain training exercises ## Pricing and in-app purchases Base price: Free. **One-time purchases** | Purchase | Price | Type | | --- | --- | --- | | 10 Hints | $0.99 | one-time | | 55 Hints | $4.99 | one-time | | 110 Hints | $8.99 | one-time | | Remove Ads | $2.99 | one-time | | Unlock Expert mode | $3.99 | one-time | | Unlock Professional mode | $3.99 | one-time | | Unlock Master mode | $3.99 | one-time | | 1,000 Coins | $2.99 | one-time | | 2,000 Coins | $3.99 | one-time | | 8,000 Coins | $7.99 | one-time | ## What do users think of Fill one? Overall sentiment: neutral **Pros** - 🤩 Addictive and fun gameplay - 🧠 Challenges the mind - 🎨 Relaxing and soothing - 👍 Simple and intuitive interface **Cons** - 💢 Excessive ads and interruptions - 🤔 Repetitive and monotonous levels - 🔑 Difficulty progression feels unfair - 🙄 Intrusive hint system **Commonly reported bugs** - Game progress resets unexpectedly - Crashes and freezes on certain devices **Most requested features** - More challenging and varied levels - Option to disable hints - Ability to save progress across devices - Customization options for visuals and audio ## Recent user reviews (10 of 371) All indexed reviews: https://appshunter.io/ios/app/fill-one-line-puzzle-game/id1091456207/reviews.md ### 3/5 — Annoying ""helpful"" hints icon *2026-03-24, version 8.6.0* The little pointer that flashes every two seconds no matter how quick you do the puzzle? ANNOYING. So incredibly irritating. I dont need hints, never will, stop emphasizing the button please!!!! Makes me click out of the app so fast, even though I like this one more than others. Especially while I'm waiting to be called in for appointments. I have other idle apps, but I like them less. ### 3/5 — :( *2026-01-08, version 8.6.0* Ads ### 1/5 — Add machine *2025-12-31, version 8.6.0* This game keeps your attention so it can play you adds. That’s all it is. One long commercial. You are the lab rat ### 5/5 — Cool game *2025-12-26, version 8.6.0* Yes ### 5/5 — Challenging puzzle game *2025-09-01, version 8.6.0* One of my absolute favorite puzzle games. Level 11-31 and still going strong. ### 1/5 — Ads *2025-08-05, version 8.6.0* Any game that has popup full screen ads immediately gets a 1 star, horrible app ### 3/5 — The ads made me insane but other than that, it’s fun challenging and makes it use your brain *2025-08-03, version 8.6.0* Is that pretty fun game other than the stupid idiot ads ### 2/5 — Ugggghhh *2025-05-31, version 8.6.0* There are way to many adds and it gets on my nerves . When I click on the “ get more coins “ button , it says to watch an add. But EVERY time I watch it it never gives me any coins back! It’s so annoying !!! But I love this game , but it has way to many adds and it’s a scam ### 5/5 — I love this game *2025-03-01, version 8.6.0* I ### 3/5 — Too Easy *2025-01-20, version 8.6.0* Wish it was more challenging. ## Frequently asked questions about Fill one ### What is this app about? This app is a connect-the-block style one-line puzzle game. The objective is to fill in all the blocks on the screen using only a single, continuous line without lifting your finger or retracing any paths. ### How many puzzles are included? The game features a substantial collection of 2,000 puzzles. These puzzles are spread across four distinct levels of difficulty, ensuring a progressive challenge as you advance. ### Is this game free to play? Yes, the game is completely free to play. While there are in-app purchases available, the core gameplay and all 2,000 puzzles can be enjoyed without any cost. Free hints are also provided for challenging puzzles. ### Who is this game for? This game is designed for anyone looking to sharpen their mind and engage in brain training. It's suitable for players of all ages who enjoy logic puzzles, mathematical challenges, or simply want a mentally stimulating way to pass the time. ### Can I get help if I'm stuck on a puzzle? Absolutely. The app provides free hints for puzzles that you might find too difficult to solve. These hints are designed to guide you towards the solution without giving it away entirely. ## Version history (last 5 releases) ### 8.6.0 — 2024-11-26 Ad SDK update Game Improvements ### 8.4.0 — 2024-04-04 Fixed a bug with in-app purchases. ### 8.3.0 — 2024-01-12 Improved privacy features ### 8.2.0 — 2022-07-14 Improved advertising experience ### 8.1.3 — 2021-12-21 Fix restoration of ads removed items ## Apps similar to Fill one | App | Rating | Price | Category | | --- | --- | --- | --- | | [Wood Block Puzzle Games](https://appshunter.io/ios/app/wood-block-puzzle-games/id1466197423) | 4.7 (429,515) | Free | Games | | [Sudoku - Brain Puzzle Games](https://appshunter.io/ios/app/sudoku-brain-puzzle-games/id1442749804) | 4.8 (306,510) | Free | Games | | [Block Puzzle - Brain Test Game](https://appshunter.io/ios/app/block-puzzle-brain-test-game/id1515874052) | 4.7 (1,168,504) | Free | Games | | [Sudoku Puzzle - Brain Games](https://appshunter.io/ios/app/sudoku-puzzle-brain-games/id1492978794) | 4.9 (88,339) | Free | Games | | [Wood Block Puzzle:Logic Master](https://appshunter.io/ios/app/wood-block-puzzlelogic-master/id1524613492) | 4.7 (61,536) | Free | Games | | [Block Blast！](https://appshunter.io/ios/app/block-blast/id1617391485) | 4.9 (2,676,572) | Free | Games | ## More apps by GAMINCAT, INC. - [Music Live - Music player](https://appshunter.io/ios/app/music-live-music-player/id938004590) - [1LINE one-stroke puzzle game](https://appshunter.io/ios/app/1line-one-stroke-puzzle-game/id1179975506) - [Jumpr!](https://appshunter.io/ios/app/jumpr/id1339090371) - [ZEN Block™-tangram puzzle game](https://appshunter.io/ios/app/zen-block-tangram-puzzle-game/id1393910125) - [Domino Line!](https://appshunter.io/ios/app/domino-line/id1490200358) All apps by GAMINCAT, INC.: https://appshunter.io/developer/1647225978 ## Related topics [fill in puzzles games](https://appshunter.io/ios/topics/fill-in-puzzles-games) · [fill puzzle](https://appshunter.io/ios/topics/fill-puzzle) · [nummind](https://appshunter.io/ios/topics/nummind) · [single line block fill puzzle](https://appshunter.io/ios/topics/single-line-block-fill-puzzle) · [single line block fill](https://appshunter.io/ios/topics/single-line-block-fill) · [block fill line puzzle game](https://appshunter.io/ios/topics/block-fill-line-puzzle-game) · [block line puzzle](https://appshunter.io/ios/topics/block-line-puzzle) · [math and brain training puzzle](https://appshunter.io/ios/topics/math-and-brain-training-puzzle) · [kanooodle brain teaser puzzle](https://appshunter.io/ios/topics/kanooodle-brain-teaser-puzzle) · [plusris](https://appshunter.io/ios/topics/plusris) · [fill](https://appshunter.io/ios/topics/fill) · [block fill puzzle](https://appshunter.io/ios/topics/block-fill-puzzle) · [fill one line puzzle games](https://appshunter.io/ios/topics/fill-one-line-puzzle-games) · [fill game](https://appshunter.io/ios/topics/fill-game) · [liai](https://appshunter.io/ios/topics/liai) · [fill line puzzle](https://appshunter.io/ios/topics/fill-line-puzzle) · [brain math puzzle riddles quiz](https://appshunter.io/ios/topics/brain-math-puzzle-riddles-quiz) · [brain box puzzle lite](https://appshunter.io/ios/topics/brain-box-puzzle-lite) · [1line](https://appshunter.io/ios/topics/1line) · [brain puzzle bundle](https://appshunter.io/ios/topics/brain-puzzle-bundle) --- *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 2026-08-29.*