Slitherlink is played on a grid of dots. Join neighbouring dots with lines to make a single loop that goes all the way round and comes back to where it started.
A number in a square tells you how many of that square’s four sides belong to the loop. Squares without numbers can have any number of sides.
Every dot has either no lines or exactly two — that one rule, together with the numbers, is enough to solve every puzzle without guessing.
Join the dots into one closed loop so that each number says how many of its square’s four sides the loop uses.
The full guide, with a worked example and common mistakes: How to play Slitherlink.
No — each dot has at most two lines, so the loop never touches or crosses itself.
No. Many dots stay unused; only the numbers have to be satisfied.
Yes — every puzzle here is checked to have exactly one loop.
Open the Slitherlink Solver, type the numbers and press Solve.