Welcome to Slitherlinks, the most comprehensive free online platform for Slitherlink puzzles (also known as Fences, Loop the Loop, Takegaki, or 数回 in Chinese, スリザーリンク in Japanese, and 슬리더링크 in Korean). Whether you're a complete beginner or an experienced logic puzzle enthusiast, we have the perfect challenge waiting for you.
What is Slitherlink? Slitherlink is a classic logic puzzle game where your goal is to draw a single closed loop on a rectangular grid. Each numbered cell tells you exactly how many of its four surrounding edges are part of the solution loop. Using pure logic and deductive reasoning, you must determine which edges to draw and which to leave empty. The loop cannot cross itself or branch off — it must form one continuous path that returns to its starting point.
Our platform offers over 3,000 hand-crafted Slitherlink puzzles spanning five different grid sizes: 5×5 (perfect for beginners), 7×7, 10×10, 15×15, and challenging 20×20 grids for experts. Each puzzle is carefully designed to have exactly one unique solution, and every size category includes three difficulty levels — Easy, Medium, and Difficult — ensuring you can progress at your own pace.
Play free Slitherlink online right now — no download required, no registration necessary. Our browser-based puzzle game works seamlessly on desktop computers, tablets, and mobile phones. Simply click on grid edges to draw lines, right-click to mark edges as empty, and use Ctrl+click to toggle uncertain marks. The intuitive interface makes it easy to focus on solving the puzzle without getting distracted by complicated controls.
Every day we feature a brand new daily Slitherlink challenge that's the same for all players worldwide. Compete for the fastest solving time on our global leaderboards, track your personal best records, and earn achievements as you master different puzzle sizes and techniques. Create a free account to save your progress, but if you prefer to play anonymously, that's perfectly fine too — the full puzzle library is accessible without signing up.
Frequently Asked Questions
What is Slitherlink and how do I play?
Slitherlink is a logic puzzle where you connect dots to form a single closed loop. Numbers on the grid indicate how many of the four surrounding edges belong to the loop. Use these clues to deduce which edges must be part of the loop and which must be empty.
Basic rules: The loop must be continuous (no breaks), cannot cross itself, cannot branch off, and must satisfy all number clues. Start with corners and 0/3 clues as they have the fewest possibilities.
Is Slitherlink really free? Do I need an account?
Yes, Slitherlinks is 100% free with no registration required. You can play any puzzle from our library of 3,000+ challenges without creating an account.
Creating a free account is optional but recommended if you want to save your progress, compete on leaderboards, track personal statistics, and earn achievements.
What grid sizes and difficulty levels are available?
We offer five grid sizes: 5×5 (2-5 min), 7×7 (5-10 min), 10×10 (10-20 min), 15×15 (20-40 min), and 20×20 (40+ min). Each size includes Easy, Medium, and Difficult variants, giving you 15 total categories.
How do I get better at solving Slitherlink puzzles?
Start with 0s and 3s — they have only one valid configuration. Look at corners which are heavily constrained. Use diagonal patterns, avoid creating loops too early, and mark impossible edges with right-click.
Can I play Slitherlink on mobile devices?
Absolutely! Slitherlinks is fully optimized for mobile phones and tablets. Our responsive design automatically adjusts the game board size, with intuitive touch controls: tap to draw lines, long-press to mark empty edges.