Slitherlink

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.

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.

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

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.