Slitherlink vs Slitherlink+

Slitherlink, the classic logic puzzle — drawn like pen on paper. The rules are simple. Each number counts the lines surrounding its cell. Satisfy every number while drawing one single closed loop — no branches, no crossings — and the puzzle is complete. It looks easy, and then the logic gets delicious. Every puzzle has exactly one solution. Guessing is never required: every generated puzzle is mathematically verified to have a unique answer. Difficulty names mean something here, too — we measure the depth of reasoning each puzzle actually needs, and only serve ones that earn their label. ■ Features • New to Slitherlink? A hands-on tutorial teaches the rules on a tiny practice board • Four difficulties — from Easy 5×5 to Expert 12×12 • Daily Puzzle — the same board for everyone each day, with an attendance calendar and streaks • Paper-quiet design — an ink-and-paper ledger look, in light and dark • Comfortable controls — tap to draw, long-press to mark ×, drag along the dots • Room for big boards — pinch to zoom, two-finger pan, iPad and Apple Pencil support • Mistake-proof — unlimited undo/redo and automatic saving • Track your progress — best and average times per difficulty For the moments you want quiet focus, one board of Slitherlink is enough.

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.