Best Free Slitherlink Game
Draw a single closed loop so every number has exactly that many lines around it.
Level 1
press P to pause
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How to play
- Read the numbers. Each number is how many of that cell’s four edges belong to the loop; a 0 means none.
- Draw and mark edges. Click an edge between two dots to draw a line, again for an ✕ (no line), again to clear it.
- Close one single loop. Connect the lines into one closed loop that satisfies every number to win.
About Slitherlink
Slitherlink (also called Loop the Loop or Fences) is a deceptively simple loop logic puzzle. You’re given a grid of dots with numbers scattered in the cells. Draw lines between adjacent dots so that they form one single continuous loop that never branches or crosses itself — and make sure each number has exactly that many of its four sides drawn. A 0 means no lines touch that cell; a 3 means three of its four edges are part of the loop. Every puzzle here is built from a real solution, so it always has a clean answer. Pick easy (5×5), normal (7×7) or hard (10×10), and solve right in your browser. No signup, nothing uploaded.
Frequently asked questions
Click the edges between dots to draw line segments. Your goal is to form one single closed loop — a continuous path that never branches or crosses — such that every numbered cell has exactly that many of its four sides drawn as part of the loop.
A number tells you how many of that cell’s four surrounding edges are part of the loop. A 0 means none of its four sides has a line; a 3 means exactly three of them do. Cells with no number can have any count.
You win when the drawn lines form one single closed loop (with no loose ends, branches or separate loops) and every numbered cell has exactly its number of edges. The game checks this automatically.
The ✕ marks an edge you’ve decided is definitely not part of the loop — a memory aid, like crossing off in pencil. Click an edge once for a line, again for an ✕, and a third time to clear it.
Yes. Every grid is generated from a known valid loop and then has its clues derived from it, so a clean solution always exists. Difficulty just changes the grid size — easy 5×5, normal 7×7, hard 10×10.
Completely free, with no signup, no download and no paywall. The puzzle generates and runs entirely in your browser, and nothing is uploaded.
Yes. It runs in your browser, so Slitherlink works on phones and tablets as well as desktop — there is no app to install.
No. Slitherlink works with no signup at all; an optional free account only exists to unlock higher usage limits.
Usually just a few seconds for a typical file — Slitherlink starts working the moment you give it your input.
Your input is processed in memory and never stored, so nothing is left behind once you have your result.