Number Path

How to play

Start on the cell marked 1 and drag a single line through the grid. The line must pass the numbered cells in order — 1, 2, 3 and so on — and finish on the highest number. Along the way it has to visit every cell of the board exactly once: it moves only up, down, left or right, never crosses itself and can't pass through the thick walls. Made a wrong turn? Drag back over your line to shorten it, tap any cell on the line to cut it back there, or use Undo. Stuck? A Hint redraws the correct route up to the next stretch, at the cost of 10 seconds on the clock. Every board is built from a random path that covers the whole grid and checked by a solver so it has exactly one solution. Play as many boards as you like, from an easy 5×5 to a hard 8×8: a fresh puzzle is generated every time, and after each solve you can jump straight into the next one. Each size has its own leaderboard for the fastest solve times.

Tips

• Look at the corners first: a corner cell has only two neighbours, so the line must enter it from one and leave by the other.
• Cells squeezed between walls or the edge often have only one way through — draw those bits before anything else.
• Count the gap between two numbers: if the shortest route is much shorter than the cells left in that area, the line has to wander to fill them.
• Don't leave a pocket of cells behind you that the line can never come back to — that's the most common dead end.
• Every hint adds 10 seconds to your time, so try a quick undo before reaching for one.