Comparison

Slitherlink vs Nonograms 999

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

Nonograms 999

Engage your mind with a vast collection of free logic puzzles. Enjoy a smooth, one-handed gameplay experience with intuitive controls, auto-save, and helpful tools like auto-fill and undo/redo. Discover a variety of handmade illustrations across different canvas sizes.

Highlights
  • 999 free logic puzzles
  • One-handed gameplay design
  • Auto-save progress
  • Auto-fill function
  • Undo/Redo functionality
  • Handmade challenges
  • Multiple canvas sizes
Features
Read full description

The puzzle has 999 challenges. And they are all free! Easy controls makes solving the challenges a smooth experience. Therefore making it a perfect way to kill your downtime! * Nonograms 999 strong point - The puzzle has 999 solutions. You’ll never pay for any of the solutions, they are all free! There is no time limit for the puzzle, so feel free to play whenever you feel like it! - Designed to be easily used with just one hand. While commuting or just riding the train, you always have one hand free for your smartphone, don’t you? With that in mind, Nonograms 999 was designed so you can play whenever the mood strikes. - There is but one but one answer for each challenge All the challenges are checked continuously so there will be no duplicate solutions. - Touch and virtual Joypad support. - Save your progress Closing the application in the middle of a solution. In order to make those cases easier we have implemented an auto save feature so you can easily pick up where you left. - Complete with an auto-fill function Continuous clicking can be a drag. In order to make the experience more enjoyable we have installed an easy auto-fill function, toggled by the simple touch of a button. When the auto-fill function is turned on you just have to move your marker over the desired squares. - Undo / Redo function When solving your challenge it's easy to make a mistake or misclick. In order to make it easy to correct such mishaps we have implemented a undo / redo function. - Easy on the eyes design For long playing session, we have designed the game with colors that are easy on the eyes. In case you enjoy playing a bit before going to sleep, this easy on the eyes design will also be good due to the darker colors. - All the challenges are handmade All the challenges within the puzzles are handmade by professionals. Please enjoy all the challenges that were handmade by professionals! * What kind of illustrations is there? In total there is 999 illustrations. You can pick from different sizes of canvas, 10x10, 15x15, 20x20, 25x25 and 30x30. The illustrations include cute animals, sea creatures, sports, vehicles, fashion, food, electrical appliances and many others! So there is a lot of illustrations to pick from! When you've cleared a puzzle it will automatically be saved to your selection screen. *Is it easy to use? Yes, the application has been designed so that anybody can use it. You can paint your boxes by clicking in the desired box. For the more advanced design with many boxes, it might be a little bit hard to hit your desired box so we have included an easy to use controller. * What is Nonograms? On the left side and above the puzzle there is a number that gives you hint on how many boxes to color on said row. With the help of those hints, you have to solve the puzzle and complete the illustration. Also, Nonograms is called "Picross", "Griddlers" and "Picture logic puzzles". *How to solve a Nonograms. Every puzzle has numbers written on the left side and above the canvas. These numbers are indicators on what boxes to paint. The numbers above the canvas indicate what boxes to paint in the vertical columns. The number on the left side of the canvas indicate what boxes to paint in the horizontal columns. In cases where there is multiple numbers, that indicates two fields, with at least one open box in between. In cases where there is no number written out, it means the entire column will be blank. These are all the rules you need to follow in order to complete your illustrations! Please enjoy this free game in order to challenge yourself during your free time! In order to make Nonograms 999 free for everyone to use it relies on advertising. Thank you for your understanding and please enjoy our application!

Screenshots

Slitherlink4 screens
Nonograms 9994 screens

Verdict

The call

The clearest difference is ads: Slitherlink at none against Nonograms 999's shown. Slitherlink also leads on review sentiment (89% vs 81%). Nonograms 999's advantage is update cadence (every 2 months vs every 4 months) and ratings volume (2.8K vs 461). 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 Nonograms 999 sells 4 one-off in-app purchases. Whichever you choose, the download price is not the number that matters.

ReceptionRating · Positive reviews · Number of ratings

Slitherlink holds the better App Store score, 4.8 against 4.6. That said, the two scores are not equally well evidenced: Nonograms 999 has 2.8K ratings behind it against 461, so its average is the more settled of the two. Written reviews point the same way: 89% of Slitherlink's written reviews are positive against 81% of Nonograms 999's.

UpkeepUpdate frequency

Slitherlink ships an update every 4 months, Nonograms 999 every 2 months. Both last shipped on October 26, 2026.

Scorecard5 real differences · 5 level
Slitherlink versus Nonograms 999: the parameters behind the verdict, then further details
ParameterSlitherlinkNonograms 999
PriceFreeFree
Rating4.8 (461 ratings) — better4.6 (2.8K ratings)
Positive reviews89.5% of reviews — better81.4% of reviews
Number of ratings4612.8K — better
Update frequencyEvery 4 monthsEvery 2 months — better
AdsNo — betterYes
In-app purchasesYesYes
MonetizationFree with in-app purchasesFree with in-app purchases
DevicesiPhone, iPad, iPodiPhone, iPad, iPod
Requires iOS15.613.0 — better
Further details — not scored
Size7 MB27 MB
Age rating4+4+
DeveloperConceptis Ltd.Seventh rank Inc.

Customer experience

Slitherlink

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

Nonograms 999

All ratings2,808 ratings
Positive91.3%
Neutral3.9%
Negative4.8%
Written reviews295 reviews
Positive81.4%
Neutral6.8%
Negative11.9%

User reviews

Slitherlink

From 461 App Store ratings

What we love

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

Room to improve

  • 🔍 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

Nonograms 999

From 2.8K App Store ratings

What we love

  • 🚀 Addictive and engaging
  • 👍 Intuitive controls and UI
  • 💡 Variety of puzzle sizes and difficulties
  • 🚀 Frequent updates with new puzzles
  • 👍 Minimal ads, non-intrusive

Room to improve

  • 🐛 Freezing and crashing issues
  • 🔋 High battery consumption
  • 🔒 No option to remove ads
  • 🐛 Progress reset after updates
  • 👎 Difficulty scaling on smaller screens

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

Nonograms 999

Reported bugs

3 issues
  • Freezing and crashing
  • Puzzle progress not saving
  • Incorrect puzzle clues/solutions

Requested features

5 requests
  • Dark mode option
  • Cross-device progress sync
  • More 30x30 and larger puzzles
  • Option to purchase ad-free version
  • Ability to mark 'unsure' squares

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
4 purchases

Nonograms 999

One-time4
  • 10 Hint Coin$0.99
  • 45 Hint Coin$2.99
  • 100 Hint Coin$5.99
Show 1 more
  • 200 Hint Coin$9.99

Questions

Is Slitherlink free?
Slitherlink is free to download, with in-app purchases available.
Is Nonograms 999 free?
Nonograms 999 is free to download, with in-app purchases available.
Which has better reviews, Slitherlink or Nonograms 999?
Slitherlink is rated higher. Slitherlink averages 4.8 out of 5 from 461 ratings, while Nonograms 999 averages 4.6 from 2.8K ratings.
Do Slitherlink or Nonograms 999 have ads?
Nonograms 999 shows ads; Slitherlink does not.
Which is updated more often, Slitherlink or Nonograms 999?
Slitherlink ships an update every 4 months, and Nonograms 999 every 2 months. Most recently, Slitherlink was updated on October 26, 2026 and Nonograms 999 on October 26, 2026.

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