Number Trail unblocked is a path-drawing logic puzzle. A few squares on the board hold numbers, and you draw one connected line that starts at 1, touches every number in turn and ends on the biggest one. The catch is that the line must also fill the whole board without visiting any square twice, so every turn you make affects the rest of the route.
How to Play Number Trail
The rules fit in four lines:
- Start on 1, the green dot.
- Step only to a square that shares a side with the end of your line. No diagonals.
- Reach the numbers in counting order.
- Fill every square and finish on the highest number, the red dot.
You can’t break a rule by accident. If you try to skip ahead to a later number, jump to a square that isn’t next to the tip of your line or cross a wall, the move is refused and the square wiggles red.
Drawing and Fixing Your Line
Press on 1 and drag through the squares in one long motion, or tap squares one at a time, with each tap adding a single step.
To fix a wrong turn, tap any square already on the line. Everything after that square is cut away, and you can redraw from there. “undo” removes just the last square, and “reset” clears the whole line and restarts the clock on the same board.
Board Sizes and Daily Puzzles
Pick a size with the chips above the board. The game starts on Med the first time, then remembers your choice.
- Easy: 5×5 squares, four numbers, no walls.
- Med: 6×6 squares, five numbers, three walls.
- Hard: 7×7 squares, six numbers, five walls.
Each size opens on a daily board based on the date, so everyone sees the same puzzle that day. The “new” button rolls a random board at the current size.
How the Puzzles Are Made
The game first draws its own random line that covers every square. Then it drops numbers on that line, always including the first and last squares, and adds walls only on edges the line never uses. That guarantees a solution always exists.
Next, the game checks whether a second route would also work. If it finds one, it tries a new layout, aiming for a board with exactly one answer. It only spends a fraction of a second on this, so on rare occasions a board may allow more than one route. Any route that follows the rules counts as a win.
Number Trail Strategy
The trick is to find squares with very few ways in or out. Here is what to look for:
- Corners first. A corner square touches only two others, so unless it holds 1 or the last number, the line must come in one side and leave by the other.
- Walls are clues. Each wall removes an option. A square boxed in by two walls and an edge may have only one possible path through it.
- Watch for pockets. If your line seals off a patch of empty squares, you can never get back to fill them. Cut the line back right away.
- Work backward from the end. The last number is fixed, so picture the final few steps that must lead into it.
- Hug the edges. Routes that run along the border early often leave a clean, open middle to sweep through later.
A Checkerboard Trick for Odd Boards
Picture the board colored like a checkerboard, with the corners dark. Every step moves you to the other color. On the odd-sized boards, Easy (5×5) and Hard (7×7), there is one more dark square than light, so a line that fills the board has to start and end on dark squares. If you ever find yourself forced to finish on a light square, a mistake happened earlier.
Mistakes New Players Make
The most common mistake is racing toward the next number by the shortest route. That usually leaves squares behind that you can’t reach later. Instead, think about which squares near the line will become hard to reach, and sweep through them on the way.
Timer, Saving and Devices
A small clock starts as soon as the board appears and stops when you solve it. There is no time limit, so you can stop and think. Your fastest time at each size is shown as Best. A help page opens the first time you play, and the ”? man” button brings it back.
Because it only uses clicks and taps, it plays well on a Chromebook, tablet or phone. Easy boards take a minute or two, which suits a short break, while Hard boards can fill a longer session.
More Logic Puzzles to Try
Light Flip is another grid brain teaser, but you switch cells off instead of drawing a path. Mine Field has you use number clues to find hidden dangers, and the 15 Puzzle is about sliding tiles into order. Find more on the puzzle games page.
