Needle strategy: how to cross every thread and sew it in

Needle looks like every other join-the-pairs puzzle for about thirty seconds, and then it asks for the opposite of what those puzzles ask. Once that lands, most of the difficulty goes with it.

The rule that catches everyone

In Flow, in Untangle, in almost every puzzle built on connecting pairs, crossing is failure. Needle requires it. A thread that runs from its pin to its twin without meeting anything is lying on the cloth, not sewn into it, and the board will not accept it however neat it looks.

You can see which ones are loose without reading anything: the colour drains out of a loose thread and its shadow falls further away, so it visibly floats above the others. The line under the board names it and says how many more crossings it needs.

From level 3 each thread needs to cross two others. Levels 1 and 2 ask for one, to teach the idea before it starts to bite.

Take the long way round

The instinct from other puzzles is to keep routes short and tidy. Here that instinct is exactly wrong. A short route meets nothing. If a thread comes up loose it does not need to be prettier, it needs to go somewhere busier — through the middle of the cloth rather than around the edge.

Lay the awkward pairs first

The hardest thread on any board is the one whose two pins sit close together, because a short gap gives it almost nothing to cross. Give that one the open cloth while the cloth is still open. Leave the pairs at opposite corners until later; they cross half the board on any route you pick and will find their crossings whatever else is already down.

Let the button earn its detour

Every colour has one button and its own thread has to pass through it. That is a detour you have already paid for, so make it work twice: look at what the thread passes on the way to its button and route so it picks up a crossing while it is there. A thread that reaches its button and gets sewn in on the same trip is usually the move that unlocks a board.

Parallel threads are wasted threads

Two threads running side by side never cross, however long they run. If two are travelling the same way and neither is sewn in, do not adjust both — turn one of them across the other. One turn fixes both.

What a cell can hold

A square carries one thread going across and one going down, and that is exactly what a crossing is. A thread that turns in a square takes the whole square, so you cannot weave through a corner. When a route refuses to go where you expect, it is almost always a corner in the way rather than a straight.

The last thread has the fewest options

As the cloth fills, routes disappear. Whichever colour you leave until last has to fit through what is left, so leave the one with the most room — usually the pair furthest apart — rather than the one that looked easiest at the start.

Stuck? Use the hint

Hint lays one thread exactly where it belongs, and it always picks the one most in your way. It is not a cheat so much as a worked example: watch where it routes, and the shape of a correct answer on that board usually becomes obvious for the rest.

Quick checklist

• Crossing is required, not forbidden. Two others per thread from level 3.
• A drained, floating thread is a loose one. The line under the board says how many it still needs.
• Loose does not mean untidy, it means too short. Route it somewhere busier.
• Lay the close-together pairs first, while there is room.
• Make the button detour pick up a crossing on the way.
• Two threads running parallel are both wasted. Turn one across the other.
• A square holds one across and one down; a corner takes the whole square.
• Leave the pair with the most room until last.

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