Slitherlink Puzzles

Welcome to Puzzle Baron's Slitherlink puzzles! Also known as Fences, Loop the Loop, or Takegaki, Slitherlink is a classic logic puzzle where you draw a single continuous loop on a grid using nothing but the numbered clues and pure deduction — no guessing required. We offer thousands of unique puzzles in three grid sizes and three difficulty levels. Play online just for fun, or register a free account to earn points and compete in our monthly Hall of Fame competitions!

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How to Play

Each puzzle presents a grid of squares. Some squares contain a number from 0 to 3 — this tells you exactly how many of that square's four edges must be part of the loop. Your goal is to draw segments along the grid lines to form a single closed loop that satisfies every clue.

The loop must follow a few simple rules:

• — The loop is a single continuous path that returns to where it started — no branches, no dead ends.
• — Each numbered cell tells you exactly how many of its four edges the loop passes through.
• — A 0 means the loop doesn't touch any edge of that cell. A 3 means the loop passes through three of its four edges.
• — Empty cells (no number) can have any number of edges — you'll figure them out from the surrounding clues.

Tips & Strategy

New to Slitherlink? Here are a few pointers to get you started:

• — Start with 0s and 3s. A 0 means all four edges are empty — mark them with X. A 3 in a corner must use all edges except one, giving you guaranteed lines.
• — Watch for adjacent 3s. Two 3s sharing an edge? That shared edge must be a line, and the outer edges of both cells are lines too.
• — Think about the dots. Every dot (intersection) must have exactly 0 or 2 lines passing through it. If a dot already has 2 lines, all other edges at that dot must be empty.
• — Avoid small loops. If drawing a line would close the loop before all clues are satisfied, that line can't be placed.
• — Use the Hint button if you get stuck. It will check your board for mistakes first, then suggest a logical next move with an explanation of the technique used.

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