WeSLink — Slitherlink together

Players

Progress

Branches

Start

Start another branch after settling one

Branch off to test a guess.

The tree

Tools

Undo

Erase

Check

View

Wheel scrolls · shift+wheel sideways · ctrl+wheel zooms · space-drag or middle-drag moves the board · arrow keys nudge

Keys

This puzzle

Fade satisfied clues Circle branch premises Show ×s as absent lines

How to play

The rules

Draw one closed loop. Each number says how many of its four sides the loop uses.

The loop never crosses itself or branches, and every number must come out exactly right.

Drawing

Click a segment between two dots to draw a line.

Shift-click (or right-click) marks it ×, meaning no line here.

Ctrl-click a square to fill it , Alt-click to fill it .

Repeating the same click removes the mark. Drag to repeat it across the puzzle.

Hold D and drag corner to corner for a diagonal.

Branches

Stuck? Branch off and guess. Your first mark is the branch's premise, circled on the board.

A branch only adds to what is above it — it can never rub out what its parent decided.

Branch again inside a branch to go deeper, or from the puzzle for a rival guess.

Hit a contradiction and rule it out: that half goes, and the other is taken as true — its assumption and everything worked out under it move up to the parent.

CREDITS

Standing on other people's work

Slitherlink was devised by Nikoli, the Japanese puzzle publisher that also gave the world Sudoku.

Krazydad — Jim Bumgardner's puzzle collection. The drawing scheme here follows his: click a segment for a line, click again to take it away, drag to keep going.

Jonathan Olson's Slitherlink — two ideas are borrowed from it: reading the board by line weight rather than × marks.

Everything else — the shared puzzles, the branches, the generator and its solver — was built for this.

Made with an AI. This program — the page, the shared puzzles, the branches, the generator and its solver — was written by Claude, an AI assistant, working from a person's instructions. Expect the odd rough edge.

VERSION —

WESLINK

Hello

One puzzle, one board, everybody's pens at once. Open a puzzle and share the code, or join one that's already running.

Your name

Grid

Difficulty

Play on your own, offline

Nothing is shared and no code is given out. Your progress stays in this browser.

Built offline with slink-gen: it uses every core, and big puzzles are far quicker there than in a tab.

Anything drawn on a puzzle is visible to everyone who has its code, including your name in the player list.

Standing on other people's work

The loop is closed.

Hello