Slitherlink is a logic puzzle where the goal is to draw a loop so each number has that many edges of the loop adjacent to it. Use with [grid-deduction] and [logical-deduction].

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### 🐍 In the Loop 🐍

Follow the ouroboros down valleys and over mountains. Is it even going anywhere? EDIT (7 days after initial posting): The grid and Penpa+ link have been updated to an easier version, with more numbers ...
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The puzzle here is to analyze the following Slitherlink configuration and show that it is impossible. ...
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### Continue a hard Loopy/Slitherlink puzzle without brute-force

This is a classic Slitherlink puzzle from Simon Tatham's Portable Puzzle puzzle collection. I was stuck at the position shown for quite a while until I found a way to continue by logical deduction. I ...
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### Turn Back the Clocks

This is part 45 of the puzzle series Around the World in Many Days. Each part is solvable on its own. Dear Puzzling, This is a Slitherlink puzzle. Draw a single continuous loop along grid lines that ...
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### Help me with Slitherink puzzle (honeycomb) solution

I got stuck on this level (Honeycomb/Large/Hard/#12) and I always end up having issues with the part that I circled with red because it either wouldn't add up or there would be a space that's not ...
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### SlitherLITS revisited - Do colour outside the lines

This is a follow-up to SlitherLITS: Don't colour outside the lines After creating that puzzle, I've been wondering whether it was possible to create a SlitherLITS puzzle where all the regions outside ...
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This puzzle is part of the Monthly Topic Challenge #13: Variety Slitherlinks. This is a Slitherlink-Yajilin hybrid. Shade some cells in the grid and draw one non-crossing, non-branching line ...
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This puzzle is part of the Monthly Topic Challenge #13: Variety Slitherlinks. A watermill is going to be built next to a cozy town. You are the designer of the aforementioned mill/slitherlink, and ...
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### Double trouble - When slitherloops collide

This puzzle is part of the Monthly Topic Challenge #13: Variety Slitherlinks. What happens when you're working on a couple of puzzles for the Monthly Topic Challenge and try to merge them? Well, in ...
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### Walking a twisted path on a donut - a Möbius Slitherlink

This puzzle is part of the Monthly Topic Challenge #13: Variety Slitherlinks. Have you ever wondered why there has to be an "inside" and an "outside" to every slitherlink loop? ...
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### Slither-Numberlink: A monstrosity nature never intended

This puzzle is part of the Monthly Topic Challenge #13: Variety Slitherlinks. Rules of hexagonal Slither-Numberlink: Some numbers in the grid are slitherlink clues, some are numberlink clues. Zeroes ...
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### An X x X Slitherlink related to X

This puzzle is part of the Monthly Topic Challenge #13: Variety Slitherlinks. The final answer is a six letter word. Prefer no partial answers. penpa
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### SlitherLITS: Don't colour outside the lines

This puzzle is part of the Monthly Topic Challenge #13: Variety Slitherlinks. Adding a bit of colour to enhance the loopy goodness of a traditional Slitherlink. Draw a single, non-intersecting loop ...
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This puzzle is part of the Monthly Topic Challenge #13: Variety Slitherlinks. I find something strangely satisfying about a well designed slitherlink puzzle, even one which is oddly coloured and ...
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### Slitherlink? I hardly know her!

This puzzle is part of the Monthly Topic Challenge #13: Variety Slitherlinks. Rules of hexagonal Slitherlink: Draw one continuous loop in the grid along dotted lines. The line cannot cross itself or ...
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This puzzle is part of the Monthly Topic Challenge #13: Variety Slitherlinks. Below is a grid containing multiple small slitherlinks. These can be independently solved to form clues for the large ...
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### Help with slitherlink honeycomb [closed]

This is the best I can do: It makes me think that I'm missing some simple detail.
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### Next step in this Slitherlink puzzle (Honeycomb)

I have applied all of the techniques that I know of, and can't figure out the next logical step. I even turned on the visual clues, but it didn't help. What would be the next move without resorting to ...
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This puzzle is part of the Puzzling Stack Exchange Advent Calendar 2022. The accepted answer to this question will be awarded a bounty worth 50 reputation.< Previous DoorNext Door > 'Twas the ...
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### Next step in this Slitherlink puzzle?

I am playing this Slitherlink app on Android, and get stuck on this puzzle at the following state: I made a lot of progress on the right side, but after this I couldn't find anything that I can do, ...
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### Is the "rocket" pattern inversible?

The rocket pattern in slitherlink is when a 3 sees a 1 in a diagonal, with two crosses (the exhaust) on the opposite side. 3 x 1 x two lines can be added ...
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I recently learned what a Slitherlink puzzle is; from here, so I tried my hand at making one! This is a normal 7x7 slitherlink, but with the added restriction that the loop must form the number 2 in ...
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### Slitherlink #1 - Very Simple [closed]

This is a simple slitherlink, which is very easy. The rules are as follows (suggested by @bobble and @PuzzlingFerret): There can be multiple loops. The final solution should be a shape. Congrats to ...
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Yesterday, I got my pen-pal to teach me the rules of Slitherlink. I had to use a translator to understand what she wrote though, and as a result I suspect I've misunderstood some of her points. I've ...
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### How to get started on this Slitherlink (No Swiss)?

This is a puzzle from Round 4 of WPF's Puzzle Grand Prix this year. It's a Slitherlink with the additional rule that "Every Swiss cross-shaped arrangement of five cells must contain at least one ...
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This is a variation on the classic Slitherlink Puzzle. However, instead of creating one loop, you must create 2 separate loops. The two loops can not share any edges, however they can cross or meet on ...
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I previously created a combined slitherlink and sukoku puzzle, but I was unsatisfied because the grid was smaller then a regular sudoku. So I made another, larger one. Below is a 9 by 9 grid. This is ...
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I like combinations of puzzles, so I decided to combine a Sudoku and a Slitherlink. Below is a 6 by 6 grid. This is filled in with numbers based on the usual rules of sudoku. All of the numbers from 1 ...
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Rules of Slitherlink: Connect adjacent dots with vertical or horizontal lines to make a single loop. The numbers indicate how many lines surround it, while empty cells may be surrounded by any number ...
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An entry in Fortnightly Topic Challenge #48: Unusual tag mix After pondering what my next puzzle would be about I decided to change my base towards the realm of slitherlink puzzles. I found this ...
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### Slitherlink - A0, B1, C2, D3

The standard Slitherlink rules apply. However, first replace $A_1$, $A_2$, $B_1$, $B_2$, $C_1$, $C_2$, $D_1$, and $D_2$; such that the Slitherlink is uniquely solvable. Moreover, these equations must ...
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### A slitherlink with only 3's

As we know, 3's seems to be very rare in slitherlinks. This is the slitherlink with only 3's.
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### Lost in this Loopy puzzle

I got this Loopy (Cairo) puzzle, but got stuck here: I have no idea how to proceed without guessing with backtracking. Are there any local deductions possible here?
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### Next step/strategies for an Area 51 (Slitherlink variant) puzzle

I've been doing quite a few Slitherlinks recently (and puzzles containing Slitherlink elements, such as Area 51). I'm familiar with all the patterns described in the Wiki article but I feel like there'...
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### How to solve this Loopy puzzle efficiently with little backtracking?

I would like to solve this Loopy (Cairo) puzzle: But I would like to do so with as little backtracking as possible. By this I mean that I want to have at most one pending guess at a time; I do not ...
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### Solve this algebraic equation

Wait what? Is there any equation?
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### What's going on with this puzzle?

What is going on with this slitherlink puzzle with clues $2^3$?
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### Slitherlink with so many 2's

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Rules: The lower part of the puzzle is a sudoku. Basic sudoku rules applied. The upper and right of the puzzle are suko puzzles. The numbers in circle and to the selected square has the same number ...
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Both Masyu and Slitherlink puzzles have as their target a single closed loop that does not touch or intersect itself. So it seems natural to create a hybrid that uses both Masyu and Slitherlink clues. ...
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Apply Slitherlink rules. In addition, all sheep must be inside the loop and all wolves must be outside the loop.
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### This new puzzle type needs a name {EXTREME EDITION}

A companion puzzle to the 'This new puzzle type needs a name' series, and inspired in part by @JeremyDover's answer to a recent question. Usually, puzzles in this series comprise a mash-up of two ...
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### Another logic study

I'm working on another idea for a combination logic puzzle, and as before I've been gearing up by creating some studies. This first one came out decently, I think, so I figured I'd share it. This ...
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### Q: What kind of logic puzzle would you like? A: Yes

A recent post and Stiv's answer provided inspiration for a new puzzle. I posted a study for this puzzle earlier; this is the bigger effort envisioned. I hope you enjoy! This puzzle consists of four ...
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Yesterday's post and Stiv's answer provided inspiration for a new puzzle. What I envision will be a big effort, so I spent part of yesterday creating a study, a sample part of the bigger puzzle to get ...
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### How to union a slitherlink and a nonogram?

I would like to union two puzzles in one. The first puzzle is a slitherlink, the second is a nonogram. The main idea is: the slitherlink's solution is the entrance for the rows of the nonogram. In the ...
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Here's a variant of a slitherlink puzzle. Each color (yellow, orange, green, blue) represents one of the numbers 0, 1, 2 or 3. Enjoy! Bonus: Can we be sure there is only one solution?
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### It's all in the 2's follow-up question

This is in regards to the solution in Slitherlink - It's all in the 2s I know it may seem dumb, but I don't understand the logic behind the second 2 chain in the solution. To help provide clarity ...
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### I'm stuck on this game of Slitherlink

I'm stuck on this game of Slitherlink. What deduction (or deductions) can be made from here? Am I missing something obvious? I verified that everything I have so far is correct by looking at the ...
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