Play a free 5×5 Slitherlink puzzle with daily boards, unlimited practice, undo and explained hints. Draw one loop around the number clues, with no timer.
Daily puzzles change at midnight UTC. Practice creates a fresh set.
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A number counts how many of its four surrounding edges are lines. A 0 has no surrounding lines. Blank squares have no number rule.
Choose Line or No line, then tap an edge. Tap its existing mark again to erase. Keyboard arrows move between edges; Enter or Space marks.
Every used dot has exactly two lines. Avoid branches, loose ends and separate loops, even if all number clues appear satisfied.
Check marks highlights incorrect lines and X marks. Explain a hint places one logically forced mark. Daily progress resumes here; Practice creates a fresh puzzle.
Slitherlink is a number-and-loop logic puzzle, also called Loop the Loop. This version creates original 5×5 boards whose solutions are unique and reachable through clue counts, dot-degree rules and the single-loop rule. It has visible line and X tools, keyboard edge navigation, undo and explanations. You do not have to mark every unused edge to finish. Daily and Practice boards use the same rules.
Completing a board saves the number of requested hints; fewer is better and 0 means no hints were requested. Check marks and Undo are free, but undoing a hint does not erase its use. Different boards are not equal-difficulty comparisons. A completed daily draft does not save another result when refreshed.
More about your scores →A 0 excludes all four edges around its square. If a neighboring 3 shares one of those excluded edges, its other three edges must be lines. At each resulting loose end, exactly one other edge must continue the loop. A green satisfied clue does not by itself confirm a finished board.
An unmarked edge is still undecided. An X means you have ruled it out. Marking exclusions lets clue counts and dot exits narrow the remaining choices.
Every numbered square can look satisfied while the lines form several small loops. Follow the line from one starting dot; a valid solution returns there without leaving another separate piece.
Start with a 0: all four of its edges can be marked No line.
When a clue already has enough lines, exclude its other edges. When it has only enough available edges left, draw them.
Follow a loose end. At a used dot, one line must enter and one must leave.
Results describe this game session. They are not IQ scores, diagnoses or clinical assessments.
No. The loop may leave squares outside it and pass alongside blank squares. Each numbered square only specifies how many of its four edges belong to the loop.
The drawn lines must also form one continuous loop. Separate small loops, branches and loose ends are not accepted.
Yes. Choose the visible No line tool and tap an edge. Right-click is an optional desktop shortcut, not a requirement.
No. The game finishes as soon as the drawn lines form one loop that satisfies all visible clues. X marks help your reasoning but are not a completion requirement.
No. It applies a clue-count, dot-degree or completed-loop deduction to the current correct marks and explains the step. Incorrect marks must be corrected first.
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