Comparison

Slitherlink vs Einstein Riddle Island Puzzle

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

Slitherlink

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
Read full description

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

About

Einstein Riddle Island Puzzle

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
Read full description

Use clues to find the treasure location! Einstein’s riddle on Treasure Island. Einstein Riddle Island Puzzle is a logical puzzle game that uses the basic principles of Einstein’s Riddle on a two-dimensional Treasure Island map. Based on clues, you discover the positions of various items and, eventually, the location of the treasure chest. The game is based on the well-known puzzle game Einstein's Riddle (also known as Zebra Puzzle or Logic Elimination). However, this version is situated on a Treasure Island map, which gives this logical game a completely new twist. First, you have a list of clues such as “The barrel is next to the palm tree. The anchor is in the forest. The mask is in the same row as the monkey.” Second, you know that each row and each column contains exactly one item. Using logical thinking, you place all the items step by step to Treasure Island and eventually discover where the treasure chest is located. Each riddle has one unique solution. Game features - 10,000+ free levels of different sizes, ranging from simple to extreme - Advanced “double” version of this puzzle game, resulting in a completely different game experience - Daily Challenge with 10 new unique puzzles - Weekly Challenge with 30 new unique puzzles - No internet connection is required to play - Simple way of keeping track of solution progress - Clues with both pictographic and verbal description - Nice Treasure Island graphics How to play - Check the clues to get the first hints of where to place the items. - Click on a clue to get a detailed verbal description of the pictograms used. - Mark the cells for possible places of the items. - Eliminate possible places using further clues and cross-logic. - When you identify the position of an item, simply drag and drop it there. - When all items are placed, you win. If you like puzzles, riddles and logical problems, this game is exactly what you are looking for! Privacy Policy: https://blackpumalabs.com/privacy_policy.html Terms of Use (EULA): https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

Screenshots

Slitherlink4 screens
Einstein Riddle Island Puzzle4 screens

Verdict

The call

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.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

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.

ReceptionRating · Positive reviews · Number of ratings

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.

UpkeepUpdate frequency

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.

Scorecard4 real differences · 6 level
Slitherlink versus Einstein Riddle Island Puzzle: the parameters behind the verdict, then further details
ParameterSlitherlinkEinstein Riddle Island Puzzle
PriceFreeFree
Rating4.8 (461 ratings) — better4.8 (8 ratings)
Positive reviews89.5% of reviews100.0% of reviews — better
Number of ratings461 — better8
Update frequencyEvery 4 monthsEvery 4 weeks — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.615.3 — better
Further details — not scored
Size7 MB22 MB
Age rating4+4+
DeveloperConceptis Ltd.LIBOR MASICEK

Customer experience

Slitherlink

All ratings457 ratings
Positive96.5%
Neutral2.2%
Negative1.3%
Written reviews171 reviews
Positive89.5%
Neutral7.6%
Negative2.9%

Einstein Riddle Island Puzzle

All ratings7 ratings
Positive100.0%
Neutral0.0%
Negative0.0%
Written reviews1 reviews
Positive100.0%
Neutral0.0%
Negative0.0%

Bugs and requests

Slitherlink

Reported bugs

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

Requested features

5 requests
  • 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

Not enough reviews yet to summarise bugs or requests.

In-app purchases

13 purchases

Slitherlink

One-time13
  • Medium Snacks 1$0.99
  • Easy Variety 1$1.99
  • Easy Variety - Large 1$1.99
Show 10 more
  • Medium Variety 1$1.99
  • Medium Variety - Large 1$1.99
  • Hard Variety 1$1.99
  • Easy Variety 2$1.99
  • Medium Variety 2$1.99
  • Hard Variety 2$1.99
  • Big & Easy 1$1.99
  • Big & Medium 1$1.99
  • Hard Variety - Large 1$1.99
  • Big & Tough 1$1.99
6 purchases

Einstein Riddle Island Puzzle

Subscriptions3
  • Supporter | Weekly$0.997 Days
  • Supporter | Monthly$1.991 Month
  • Supporter | Yearly$14.991 Year
One-time3
  • +10 hints$0.99
  • +25 hints$1.99
  • +100 hints$4.99

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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