How to Play Slitherlink
Draw a single closed loop along the grid lines so that each numbered cell has exactly that many sides of the loop adjacent to it.
Try it now — Easy 7x7 →The Rules
- Draw a single non-intersecting closed loop along the grid lines
- The number in each cell tells you how many of its four sides are part of the loop
- No grid edge may be used more than once
- Cells with no number can have any number of edges (0–4) in the loop
Available in 4 sizes (5x5, 7x7, 10x10, 15x10) and 3 difficulty levels (easy, normal, hard).
See It in Action
Click edges between dots to draw them — the number in each cell tells you how many of its edges are part of the loop
How to Play
- Mark all four sides of every "0" cell as empty — the loop never passes through there
- For "3" cells, at least three sides are in the loop; deduce which three based on surrounding context
- Apply corner logic: if a line enters a dot, it must exit in a different direction
- Build out from forced edges until the loop closes into a single circuit
Pro Tips
"0" clues are the most powerful — they instantly clear all four adjacent edges
A "3" next to a "0" forces three specific sides of the "3" to be part of the loop
Never create a small closed loop prematurely — the final answer is always one single loop
Frequently Asked Questions
What is Slitherlink?
Slitherlink is a logic puzzle where you draw a single non-intersecting loop along the grid lines. Clue numbers inside cells tell you how many of the four surrounding edges are part of the loop.
Choose Your Challenge
Start with easy to learn the rules, then progress to harder difficulties.