The Solver’s Desk · Zip
Zip strategy — solve the daily path puzzle faster
The short answer
Solve Zip by drawing the moves you are not choosing. Fix the forced segments first — the corners and any cell with a single open neighbour — connect consecutive numbers by the shortest route that keeps every cell reachable, and never make a move that strands a cell. Guess last, and rarely.
Why forced moves win the puzzle
Zip looks open-ended — a blank grid, a few numbers — but it is far more constrained than it appears. The line has to fill every cell exactly once, and that single requirement quietly removes almost all of your freedom. Most cells, once you look closely, have only one legal way for the line to pass through them. The whole game is finding those cells and drawing their forced connections before you spend effort anywhere else.
The reason a fixed, forced-move approach beats guessing is that a well-formed Zip board has exactly one solution. There is no luck to chase and no branching to gamble on: if a move is forced, it is part of the answer, full stop. Every forced segment you draw shrinks the puzzle, often turning a neighbouring cell into a new forced move — a chain reaction that does most of the solving for you.
That is why the strongest solvers barely deliberate. They are not searching for a complete route in their heads; they are scanning for cells that have no choice, drawing those, and repeating until the board is done. The tactics below are simply the places where forced moves hide.
Six tactics that solve most boards
| Tactic | What to look for | Why it works |
|---|---|---|
| 1 Work forced ends first | Any cell the line must pass through that has only one open neighbour. | With a single free neighbour, the connection is forced — there is no other legal move, so draw it before anything else. |
| 2 Corners & degree-one cells | Grid corners (two neighbours) and any cell walled or blocked down to one. | A corner must use both of its neighbours; a degree-one cell must use its only one. Both hand you free segments. |
| 3 Never strand a cell | Moves that would seal off a lone square or an isolated pocket. | The line has to reach every cell, so any move that makes a cell unreachable is illegal — ruling it out often leaves one route. |
| 4 Shortest forced route between numbers | The gap between consecutive numbers, e.g. from 2 to 3. | Connect them by the route that still lets every other cell be filled; usually only one such route survives. |
| 5 Avoid isolated pockets | Regions the growing line is about to fence off from the rest of the grid. | Once a pocket is cut off with the wrong number of cells or no exit, the board is unsolvable — spot it before you commit. |
| 6 Read the walls | Barriers drawn between two neighbouring cells. | A wall removes a connection, so it narrows the choices — treat every wall as a clue that forces the route elsewhere. |
How to read this. Tactics one and two are pure certainty — draw them with no thought at all. Three, four and five are the reachability test: can the line still reach every remaining cell? Six, the walls, quietly make all of the above easier by taking options off the table.
A worked solving sequence
Here is the order those tactics play out on a real board. First, the corners. Each corner cell touches only two others, so the line must run through both — draw those four little elbows straight away, before you have thought about a single number. That alone fixes eight segments and pins down how the line meets the edges.
Second, the dead ends. With the corners in, scan for any empty cell that now has just one open neighbour — a wall or the edge blocks the other sides. Its connection is forced. Draw it, then look again: that neighbour may now be down to one open side of its own, forcing the next segment. Follow the chain as far as it runs before you make any real decision.
Third, bridge the numbers. Say 1 is fixed in a corner and 2 sits two cells away. Trace the shortest path from 1 to 2, then apply the test that settles everything: does it strand a cell? If that route seals off a square the rest of the line can no longer reach, discard it — and usually only one route passes. Repeat from 2 to 3, 3 to 4, and on up.
Fourth, close it out. By now most of the grid is drawn and only a small blank region remains. Fill it with the one snake that touches every leftover cell and lands you on the highest number last. If two ways look possible, one of them strands a cell — check reachability and take the other.
Speed tips. When you are racing the clock, keep your eyes on the most constrained cell on the board rather than the head of your line — the tightest corner or the cell hemmed in by walls is where the next forced move lives. Draw forced moves on sight and never stop to guess while one is available. If you truly cannot find a forced move and are tempted to gamble, that is the moment to take a single Hint rather than draw a wrong segment you will have to unpick later.
Common mistakes to avoid
Zip strategy FAQ
What is the best way to start a Zip puzzle?
Start with the moves you are not choosing. Scan the corners first — each corner cell has only two neighbours, so the line is forced to use both — then look for any cell with a single open neighbour. Drawing those forced segments before you make a single guess usually cracks the board open.
Do Zip puzzles always have exactly one solution?
Yes. Every well-formed Zip board is built so that exactly one continuous path fills the grid and reaches the numbers in order. Our generator runs each board through a backtracking Hamiltonian-path solver before publishing to confirm the route is unique, which means you can always reason a move out rather than guess.
How do I stop getting stuck near the end of a Zip puzzle?
Getting stuck at the end almost always means you stranded a cell earlier. Before every move, check that the line can still reach every remaining cell — if a move seals off a lone square or an isolated pocket, it is wrong. Watching reachability as you go stops the dead ends before they happen.
What are the walls in a Zip puzzle?
A wall is a short barrier drawn between two neighbouring cells that the line cannot cross. Treat it as a locked door: those two cells are simply not connected. Walls are a gift to the solver, because they remove options and often force the route through the only opening that is left.
How can I solve Zip faster?
Speed comes from drawing forced moves instead of hunting for a whole solution. Fix the corners and degree-one cells first, connect consecutive numbers by the shortest route that keeps every cell reachable, and never pause to guess when a forced move is available. The fewer choices you actually make, the faster and cleaner the solve.
Got the tactics? Put them to the test.
The single most common way to lose time in Zip is to guess a stretch of line that looks fine locally, then discover ten cells later that it stranded a corner. Every wrong guess has to be unpicked. Draw only forced moves and you never have to walk one back.
Stranding a cell. The classic Zip error: you run the line past a square without leaving it a way in, and it becomes unreachable. Before every move, ask whether the line can still reach every remaining cell. If not, take the other route.
Sealing off a pocket. A subtler version — the line fences off a whole region with no exit, or with the wrong parity so it cannot be filled and left cleanly. Watch the shape of the blank area you are leaving behind, not just the cell in front of you.
Reaching a number out of order. It is easy to bump into 3 while heading for 2. The read-out flags it, but you still lose the steps. Keep the next number you owe — and only that one — in mind as your near-term target.
Ignoring the walls. A wall is not decoration; it is a removed connection that usually forces the route. Solvers who skim past the walls end up guessing at junctions the walls had already decided for them.
Chasing the head of the line. Fixating on where your line currently ends, rather than on the most constrained cell anywhere on the board, is how forced moves get missed. Let the tightest cell on the grid, not your cursor, tell you what to draw next.