Slitherlink is a logic puzzle: draw one closed loop through a grid of cells. Each number says how many sides of that cell the loop runs along. Every puzzle has exactly one solution and you can always find it by reasoning without guessing.

There are absolutely no ads and you can play offline.

Not just squares
Classic Slitherlink is played on squares. Here they are one grid among many: Honeycomb Cairo pentagons Kites Diagonals Snowflakes and Penrose tiles with more on the way.

Play your way
Four sizes from small to huge and three difficulties in every grid. Mark your favorites and let the game deal you a random one.

Unlimited levels
Honeycomb is free forever and its levels never run out. Every other grid comes with free levels to try and a single one-time purchase unlocks unlimited levels in it.

Help with thinking
Lines and clues color themselves as you progress. Parity shading lets you mark the inside and the outside of the loop by hand or automatically. Wrong edges can be highlighted. Or switch it all off for the harder pen-and-paper look.

Made for long puzzles
Unlimited undo and redo. Bookmarks to come back to. Zoom phone and tablet layouts in either orientation and light and dark themes.

See how you did
When you finish see the median time of everyone who solved that kind of puzzle and where yours stands. Share it if you like or turn the ranking off for a no-pressure game.

New to Slitherlink?
The built-in tutorial teaches the rules and the basic patterns in a few minutes.

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Questions or problems? Please email and you will get an answer.

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Slitherlink is also known as Loopy Loop the Loop Fences Takegaki Suriza and Dotty Dilemma. If Sudoku has gone stale this is the next puzzle to learn.