Slitherlink: Loop the Snake

In-app purchases
1.96K reviews
Content rating
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About this game

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.


• 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


• 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
• Graphic previews showing puzzles progress as they are being solved
• Portrait and landscape screen support (tablet only)
• Track puzzle solving times
• Backup & restore puzzle progress to Google Drive


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.
Updated on
Apr 3, 2024

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
This app may collect these data types
App info and performance
Data isn’t encrypted
You can request that data be deleted

Ratings and reviews

1.74K reviews
Eric Johnson
May 31, 2022
Takes a minute to get used to knowing when it'll automatically put in an x instead of a line where you tap, but after that, it's pretty easy to play! I love the number of free puzzles they give you. They have options to help you if you get stuck or made a mistake. They have free weekly puzzles, and when you run out of freebies, you can buy more puzzles for very cheap! The company that makes this also makes some very good puzzle magazines. Let's keep supporting them!
21 people found this review helpful
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Artur Boszczyk
June 4, 2023
It is quite annoying when you de-select line, it will automatically insert 'x' symbol. If you have to change strategy and de-select 20 lines, then you have to deal with mess by clicking 20 times more to remove crosses. Please redevelop app and use long key press to insert 'x'. Short key press should be used to select/deselect alternatively. Thanks
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Conceptis Ltd.
June 17, 2023
Thank you for your feedback, and we will look into your suggestion. The problem is that the current UI has been this way for over 10 years and making changes might confuse some of the users.
Doris Beayrd
January 7, 2023
Very challenging, zero ads. I enjoy playing it a lot. The only thing I don't like is the bigger the puzzles get, the smaller my screen gets. lol, of course no fault of the developers, I just need a bigger screen. Anywho, slitherlink is one of my favorite games. Thank you for giving it to us all for free.
3 people found this review helpful
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Conceptis Ltd.
January 15, 2023
Thank you for your feedback. Note that you can always enlarge the puzzle by zooming out: using 2 finger, pinch-out the same way you would enlarge a photograph. Hope this helps!

What's new

This major update introduces new architecture, features and improvements:

• Puzzle packs are now split into Library, showing free and purchased puzzle packs, and Shop, showing puzzle packs you can buy
• Filtering by difficulty, size, and price
• Improved sorting options
• Previous/next navigation when completing a puzzle
• Wishlist
• Archiving in the Library section
• Automatic restoring purchases when re-installing the app
• Automatic puzzle pack list refreshing in the Shop section