# Slitherlink vs Einstein Riddle Island Puzzle

The clearest difference is ads: Slitherlink at none against Einstein Riddle Island Puzzle's shown. Slitherlink also leads on ratings volume (461 vs 8). Einstein Riddle Island Puzzle's advantage is update cadence (every 4 weeks vs every 4 months) and review sentiment (100% vs 89%). On price, rating, in-app purchases and monetization model there is nothing between them.

Both are free to download. Slitherlink sells 13 one-off in-app purchases and Einstein Riddle Island Puzzle sells 6 in-app purchases, starting at $0.99 per 7 days. Whichever you choose, the download price is not the number that matters.

On the App Store both sit at effectively the same score — 4.8 for Slitherlink against 4.8 for Einstein Riddle Island Puzzle. That said, the two scores are not equally well evidenced: Slitherlink has 461 ratings behind it against 8, so its average is the more settled of the two. Written reviews are what separate them: 89% of Slitherlink's written reviews are positive against 100% of Einstein Riddle Island Puzzle's.

Slitherlink ships an update every 4 months, Einstein Riddle Island Puzzle every 4 weeks. The most recent releases landed on October 24, 2026 and October 21, 2026 respectively.

## The numbers

| Metric | Slitherlink | Einstein Riddle Island Puzzle |
| --- | --- | --- |
| Price | Free | Free |
| Rating | **[4.8 (461 ratings)](https://appshunter.io/ios/app/slitherlink-loop-the-snake/id605918324/reviews)** | [4.8 (8 ratings)](https://appshunter.io/ios/app/einstein-riddle-island-puzzle/id6751533247/reviews) |
| Number of ratings | **461** | 8 |
| Positive reviews | 89.5% of reviews | **100.0% of reviews** |
| In-app purchases | Yes | Yes |
| Ads | **No** | Yes |
| Update frequency | Every 4 months | **Every 4 weeks** |
| Monetization | Free with in-app purchases | Free with in-app purchases |
| Size | 7 MB | 22 MB |
| Requires iOS | 15.6 | **15.3** |
| Devices | iPhone, iPad, iPod | iPhone, iPad, iPod |
| Age rating | 4+ | 4+ |
| Developer | [Conceptis Ltd.](https://appshunter.io/developer/479420055) | [LIBOR MASICEK](https://appshunter.io/developer/1783292926) |

## What reviewers say

### Slitherlink

[App page](https://appshunter.io/ios/app/slitherlink-loop-the-snake/id605918324)

Solve logic puzzles by drawing a single loop around clues on a grid. Connect dots to form a continuous line, with no crossings or branches. Offers endless fun and intellectual challenge for puzzle enthusiasts.

**Highlights:** 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

**Features:** Family Sharing, Vision Pro support

**In-app purchases (13)**

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

**What reviewers like**

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

**What reviewers complain about**

- 🔍 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

**Reported bugs**

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

**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


### Einstein Riddle Island Puzzle

[App page](https://appshunter.io/ios/app/einstein-riddle-island-puzzle/id6751533247)

Engage your logic skills with this treasure island-themed puzzle game. Use provided clues to deduce the placement of items and uncover the hidden treasure chest. Offers thousands of levels and daily challenges for endless brain-teasing fun.

**Highlights:** Logic puzzle gameplay, Treasure island theme, Thousands of levels, Daily and weekly challenges, Offline play, Pictographic and verbal clues

**Features:** macOS Compatibility, Vision Pro support

**In-app purchases (6)**

| Purchase | Price | Billing |
| --- | --- | --- |
| Supporter \| Weekly | $0.99 | per 7 days |
| Supporter \| Monthly | $1.99 | per month |
| Supporter \| Yearly | $14.99 | per year |
| +10 hints | $0.99 | one-time |
| +25 hints | $1.99 | one-time |
| +100 hints | $4.99 | one-time |


## Frequently asked questions

### Is Slitherlink free?

Slitherlink is free to download, with in-app purchases available.

### Is Einstein Riddle Island Puzzle free?

Einstein Riddle Island Puzzle is free to download, with in-app purchases available.

### Which has better reviews, Slitherlink or Einstein Riddle Island Puzzle?

Slitherlink is rated higher. Slitherlink averages 4.8 out of 5 from 461 ratings, while Einstein Riddle Island Puzzle averages 4.8 from 8 ratings.

### Do Slitherlink or Einstein Riddle Island Puzzle have ads?

Einstein Riddle Island Puzzle shows ads; Slitherlink does not.

### Which is updated more often, Slitherlink or Einstein Riddle Island Puzzle?

Slitherlink ships an update every 4 months, and Einstein Riddle Island Puzzle every 4 weeks. Most recently, Slitherlink was updated on October 24, 2026 and Einstein Riddle Island Puzzle on October 21, 2026.

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*Compared by [AppsHunter](https://appshunter.io/) from daily US App Store data. Review summaries are generated from verbatim App Store reviews.*