Slitherlink - Free Online | FunToolX
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About this tool
Slitherlink is a free online game. Draw one closed loop matching the number clues. Play instantly — no install, no waiting. It runs entirely in your browser — no download or sign-up needed.
In a lattice grid, some grids have numbers (0-3). Draw a line between adjacent points to eventually form a closed loop that does not cross. Numbers indicate how many of the four sides of the grid are loops.
Problem solving idea: The number 3 means that three of the four edges are loop edges, and the number 0 means that none of the four edges are. Start reasoning from a certain grid and gradually deduce the edges of other grids. Circuits cannot cross or branch.
Difficulties range from 5×5 to 20×20. Click the position between two adjacent points to draw or erase a line. Right-click marks identify edges that are not loops (crosses). Draw dots and wires with SVG or Canvas.
The Slitherlink game connects adjacent points to form a closed loop based on the number hints in the grid. The numbers indicate how many sides there are around the grid.