Loop Line
In Loop Line you draw one closed loop where every dot has exactly two lines. Free, no install, no sign-up, no clock, many valid solutions.
In Loop Line you join the dots with lines until they form a single closed loop. Every dot you use must have exactly two lines on it — and all of them must belong to the same loop.
about 21.0 KB
Works offline after the first visit. No install, no sign-up.
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How to play Loop Line
Two conditions, both required
First, every dot you use must have exactly two lines attached — no dead ends and no junctions. Second, everything must connect into one single loop. Passing the first does not imply the second.
Why the second condition matters
Two separate small squares both satisfy the two-lines rule, and both are closed. They are still two loops rather than one, so the puzzle is not finished. The status line says which of the two cases you are in, rather than just reporting that something is wrong.
Dots turn green when they are satisfied
A dot with zero lines is a small grey point, one with exactly two lines turns green, and anything else turns red. The count of wrong dots is shown, so you never have to count them yourself.
Some edges are blocked
A few gaps are crossed out in red and cannot be used at all. They are there to make the loop wind rather than take the obvious outer ring.
There is no single intended answer
The puzzles are open: any loop that satisfies both conditions counts, and there are many. Nothing is checked against a stored solution, because there is not one.
Tap a gap between two dots
Tapping toggles that line on or off. Tapping near a line you already drew removes it, so mistakes cost nothing to undo.
Loop Line Tips and Strategy
Never close a loop early
The common failure is a board where every dot is green but the lines form two separate loops. Before you draw the line that closes a circuit, count the dots still unused: if any remain, that loop is too small and the other cannot be joined to it later. Checking that one number each time is what stops the split.
Start at a blocked edge
Crossed-out edges mark places the loop cannot go, which makes them useful anchors rather than obstacles. Begin at a dot beside one and give it two lines, then keep extending along the only unused edge out of each dot. Following that rule from one start keeps you on a single cycle instead of wandering into a closed ring.
Read the dots as status
Grey means unused, green means exactly two lines, red means too many or too few. Use the colour to find the weakest point of a nearly finished loop: a grey dot mid-path is a gap you have to route around, and a red dot means a junction crept in. Fix red before you extend anything else.
Loop Line — Frequently Asked Questions
The dots are all green but it says not finished. Why?
Because the lines form more than one loop. Green dots only prove each dot has two lines; the status line tells you whether that is one loop or several.
Is there a right answer I am supposed to find?
No. Any single closed loop that uses no blocked edge is accepted. Different players will draw different valid loops on the same board.
Can two lines cross?
Lines only run between adjacent dots, so they cannot cross. Each edge is either drawn or not.
Does it need installing or an account?
No. It runs in the browser on a phone, tablet or computer and works offline after the first visit.
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