One Line Grid
- Rating:
- 6 (5 votes)
- Engine:
- HTML5 / JavaScript
- Platform:
- Browser (Desktop and Mobile)
- Orientation:
- Landscape and Portrait
- Release date:
- August 14, 2026
- Last update:
- August 14, 2026
One Line Grid Game Description
One Line Grid is a minimalist logic puzzle about finding one continuous route through the whole board. Start at dot 1, visit every numbered dot in order, cover each open cell exactly once, and never cross a wall.
Choose Easy, Medium, or Hard and solve a fresh procedurally generated board with a proven unique solution. Retrace the path to erase a mistake, use a hint when stuck, and track personal best and average solve times for every difficulty.
One answer, proved before you play
Boards are built backwards: the route exists first, then walls are added until a solver can find exactly one route left. So you are never hunting for a lucky guess. Every wall is information, and a cell with only one open neighbour left has already told you where the line goes.
Stuck? Work in from the edges
Corners are forced first: a cell with two open sides uses both of them. Follow the edges inward, keep the next numbered dot in view, and drag back along the line to unwind a mistake. Undo, Reset and New Puzzle are free, so no attempt can cost you the board.
How to play One Line Grid?
Desktop
Hold left mouse button on dot 1 and drag = Draw the line
Drag back along the line = Erase
Arrow keys = Extend the line
Mobile
Press dot 1 and drag one finger = Draw the line
Drag back along the line = Erase
Both
Undo = Take back one cell
Reset = Clear the board
Hint = Draw on to the next dot
New puzzle = Fresh board
Hint
One unbroken line covering every open cell exactly once, reaching the numbered dots in order. Walls block it, and the clock only records — there is no time limit.
Platform
Browser Desktop , Mobile and Tablet
Release date
August 14, 2026
Last update
August 14, 2026
FAQs
Is every puzzle solvable?
Yes. Every board is generated with a route and proved to have exactly one before it is shown, so no board is ever impossible or ambiguous.
Why are some cells missing from the grid?
Boards come in shapes: L, cross, donut, notch. Those holes are not playable, and the line routes around them.