# Slitherlink: Loop the Snake — Looping fence puzzles

> Logic puzzle game where users draw a single loop to surround numbered clues. (iPhone/iPad app by Conceptis Ltd..)

- Source: https://appshunter.io/ios/app/slitherlink-loop-the-snake/id605918324 (this page in markdown: same URL + `.md`)
- Developer: [Conceptis Ltd.](https://appshunter.io/developer/479420055)
- Category: Games, Entertainment, Board, Puzzle
- Price: Free with in-app purchases
- Rating: 4.80/5 from 457 App Store ratings · 171 written reviews indexed
- Age rating: 4+
- Requires: iOS 15.6 · 7 MB
- Languages: American English, Korean, Chinese (Simplified, China), Japanese
- Released: 2013-05-02
- Data updated: 2026-08-31
- Monetization: free with in-app purchases
- User reviews in markdown: https://appshunter.io/ios/app/slitherlink-loop-the-snake/id605918324/reviews.md

## What is Slitherlink?

Surround each clue with lines to form one single loop! Each puzzle consists of a rectangular lattice of dots with some clues in various places. The object is to connect the dots surrounding each clue so that the number of lines equals the value of the clue and the lines around all clues form one continuous loop with no crossings or branches. Empty squares may be surrounded by any number of lines.

Slitherlink are addictive loop-forming puzzles which were invented in Japan. Using pure logic and requiring no math to solve, these fascinating puzzles offer endless fun and intellectual entertainment to puzzle fans of all skills and ages.

The game features 2-finger tapping for quick zoom, auto complete clues setting and a link segment highlighting option to help to avoid creating separate loops. To help see the puzzle progress, graphic previews in the puzzle list show the progress of all puzzles in a volume as they are being solved. A Gallery view option provides these previews in a larger format.

For more fun, Slitherlink contains no ads and includes a Weekly Bonus section providing an extra free puzzle each week.

PUZZLE FEATURES

• 200 free Slitherlink puzzles
• Extra bonus puzzle published free each week
• Multiple difficulty levels from very easy to extremely hard
• Grid sizes up to 16x22
• Puzzle library continuously updates with new content
• Manually selected, top quality puzzles
• Unique solution for each puzzle
• Hours of intellectual challenge and fun
• Sharpens logic and improves cognitive skills

GAMING FEATURES

• No ads
• Unlimited check puzzle
• Unlimited Undo and Redo
• Auto complete clues
• Highlight link segment
• Quick zoom using 2-finger tap
• Concurrently playing and saving multiple puzzles
• Puzzle filtering, sorting and archiving options
• Dark Mode support
• Graphic previews showing puzzles progress as they are being solved
• Portrait and landscape screen support (iPad only)
• Track puzzle solving times
• Backup & restore puzzle progress to iCloud

ABOUT

Slitherlink have also become popular under other names such as Fences, Loop the Loop, Loopy, Suriza, Dotty Dilemma and Number Line. Similar to Sudoku, Kakuro and Hashi, the puzzles are solved using logic alone. All puzzles in this app are produced by Conceptis Ltd. - the leading supplier of logic puzzles to printed and electronic gaming media all over the world. On average, more than 20 million Conceptis puzzles are solved each day in newspapers, magazines, books and online as well as on smartphones and tablets across the world.

Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
Privacy Policy: https://www.conceptispuzzles.com/index.aspx?uri=info/doc/220

## Key features

- Draw a single continuous loop
- Surround numbered clues
- Pure logic, no math required
- Weekly bonus puzzles
- Multiple difficulty levels
- Auto complete clues
- Highlight link segment

## Pricing and in-app purchases

Base price: Free.

**One-time purchases**

| Purchase | Price | Type |
| --- | --- | --- |
| Easy Variety 1 | $1.99 | one-time |
| Easy Variety - Large 1 | $1.99 | one-time |
| Medium Variety 1 | $1.99 | one-time |
| Medium Variety - Large 1 | $1.99 | one-time |
| Hard Variety 1 | $1.99 | one-time |
| Easy Variety 2 | $1.99 | one-time |
| Medium Variety 2 | $1.99 | one-time |
| Hard Variety 2 | $1.99 | one-time |
| Big & Easy 1 | $1.99 | one-time |
| Big & Medium 1 | $1.99 | one-time |
| Medium Snacks 1 | $0.99 | one-time |
| Hard Variety - Large 1 | $1.99 | one-time |
| Big & Tough 1 | $1.99 | one-time |


## What do users think of Slitherlink?

Overall sentiment: positive

**Pros**

- 🎉 Challenging and fun puzzles
- 👍 Well-designed and intuitive interface
- 🔍 Helpful check and undo features
- 💡 Variety of puzzle sizes and difficulty levels
- 🧠 Requires logical thinking
- 🕰️ Great time-killer game

**Cons**

- 🔍 Lack of coloring/marking tools to differentiate loop segments
- 💰 Expensive puzzle pack prices
- 🌙 No dark mode option
- 🐛 Occasional bugs and crashes
- 🔍 Limited free puzzle content

**Commonly reported bugs**

- App not loading properly for some users
- Freezing issues on login screen
- Incompatibility with older devices

**Most requested features**

- Add a dark mode option
- Implement coloring/marking tools for loop segments
- Provide more free puzzle content
- Reduce pricing for puzzle packs
- Add a rewind/undo feature to go back to previous puzzle states

## Recent user reviews (10 of 171)

All indexed reviews: https://appshunter.io/ios/app/slitherlink-loop-the-snake/id605918324/reviews.md

### 5/5 — とてもよいです

*2026-07-11*

スマホだと、大きい問題がやりにくいけど、タブレットなら問題ないです。
設計も親切。とても良いです！

### 5/5 — 難しさに挑戦

*2026-06-13*

先日大きめのスルーザゲームに挑戦しましたが数が増えると難しさが倍増して諦めましたが、少しづつ増やしていけるので挑戦がしやすい

### 5/5 — Thank you

*2026-05-30, version 5.4*

I just love all your games

### 4/5 — クリア演出が無い

*2025-07-01*

線を消してクリアすると演出が無いままプレイ終了になる。

具体的には余計な空間に線を引いたまま完成して余分な線を消す。通常線を引いて完成するが線を消して完成した場合の演出処理が抜けていると思われる。
メニューは正常に動作するので戻るとクリア扱いになっている。線を消した場合のクリア演出だけが抜けているようだ。

**Developer response:** 手元にあるデバイスで確認させていただきまして、最後にいらない線を消した場合にクリア演出がでないのはバグのようです。開発とシェアさせていただきます。ご指摘ありがとうございました。

### 5/5 — 面白い

*2025-06-29*

100×150みたいなとんでもないのもやりたい

### 5/5 — 紙のスリザーリンクが大好きなので

*2025-04-24*

昔から紙でやるスリザーリンクが大好きで2時間かかる大きなものもよくやっていました。
無心で集中でき、悩むところもあればサクサク書き込めたり、達成感ぎあり大好きです。
こちらのアプリは気軽に楽しめるのと操作性もとても良いと思います。

### 5/5 — 素晴らしい

*2025-02-01*

無料の問題が多くあるし、追加の問題も300円程度で買い切り。その買い切りの問題も大量にある。
同じ問題をなん度もできるし、買わなくても定期的に一問ずつ無料配信される（これはひと月ほどで消える）。
こんなに遊びやすいパズルゲームはないと思います。

### 5/5 — 楽しませていただいています

*2025-01-04*

本筋と関係ない線をわざと残した状態で完成させた後に残した余計な線を消すと、完成扱いだが完成画面に移行しないバグがずっとある

**Developer response:** ご意見ありがとうございます。論理だけで詰められないと思われる個所があるということで、宜しければ、問い合わせメールに画像などいただけましたら、可能な範囲で回答させていただきます。

### 5/5 — Played for a decade

*2024-11-07*

I apparently downloaded this originally in 2014, and have played sporadically since. It’s a great puzzle game, and I was very excited to finally beat all the Hard starting puzzles.

### 4/5 — Good challenge

*2024-11-05*

These puzzles are challenging and fun, and the concept is well-executed. The app lacks a way to keep track of “What-if” scenarios which I’ve found to be necessary for those of us who can’t keep multiple hypotheticals in our heads at once at the hard/very hard levels. I would love to see a way to mark walls with different colors, for instance, or save the puzzle state so I can revert back to a known-good state later.

**Developer response:** Thank you for your feedback and suggestion. The feature you are referring to is sometimes call "Try mode" in which users can try various steps and then go back to the initial state at the tap of a button. We are always looking at ways to improve our games and this has been on our list for some time. However, we always had higher priorities so we hope we will get to this some day.

## Frequently asked questions about Slitherlink

### What is Slitherlink: Loop the Snake?

Slitherlink: Loop the Snake is a logic puzzle game where players draw a single, continuous loop around numbered clues on a grid. The number of lines surrounding each clue must match its value, and the loop cannot have crossings or branches. It's designed to sharpen logic and cognitive skills.

### How do I play Slitherlink?

You play by connecting dots on a grid to form a single loop. Each clue indicates how many lines should surround it. You use pure logic to deduce where the lines go, ensuring the entire grid is enclosed by one continuous loop without any breaks or intersections.

### Is the app free to play?

Yes, the app is free to play and contains no ads. It offers 200 free puzzles and an extra bonus puzzle each week. Additional puzzle packs or content may be available through in-app purchases.

### What devices is Slitherlink compatible with?

The app is designed for mobile devices and supports both portrait and landscape screen orientations, with specific support for iPad in both orientations. It also offers iCloud backup and restore for puzzle progress.

### What are some common use cases for this app?

This app is ideal for anyone looking for a mentally stimulating activity, such as commuters, students, or anyone who enjoys brain teasers. It's a great way to pass the time while exercising your logical thinking and problem-solving abilities.

## Version history (last 5 releases)

### 5.4 — 2026-04-28

This version improves performance and stability.

### 5.3 — 2025-12-17

This version improves performance and stability.

### 5.2 — 2025-08-22

This version improves performance and stability.

### 5.1 — 2025-04-02

This version improves performance and stability.

### 5.0 — 2024-12-09

This version improves performance and stability.

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## More apps by Conceptis Ltd.

- [Fill-a-Pix: Minesweeper Puzzle](https://appshunter.io/ios/app/fill-a-pix-minesweeper-puzzle/id479420052)
- [Pic-a-Pix: Nonogram Color](https://appshunter.io/ios/app/pic-a-pix-nonogram-color/id503132420)
- [Link-a-Pix: Nonogram Links](https://appshunter.io/ios/app/link-a-pix-nonogram-links/id517602670)
- [Sudoku: Classic & Variations](https://appshunter.io/ios/app/sudoku-classic-and-variations/id537201666)
- [Hashi: Bridges](https://appshunter.io/ios/app/hashi-bridges/id567583852)
- [Nurikabe: Islands & Walls](https://appshunter.io/ios/app/nurikabe-islands-and-walls/id581912445)

All apps by Conceptis Ltd.: https://appshunter.io/developer/479420055

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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 2026-08-31.*