One Line
Mimi's color-grid workshop

One Line

Plan one continuous route and fill every open cell without visiting any cell twice.

WeightPlay Original Game Guide

One Line

One Line is an original 30-stage grid puzzle starring Rainbow Hop Mimi. Begin on the glowing paw, move through edge-sharing open cells, and color the entire board with one continuous route without visiting any cell twice.

Grid-route planningOne-line puzzleSpatial reasoning
GameplayOne-line grid routing
GenreLogic · Route planning · Puzzle · Animal
DifficultyEasy start, more demanding routes
Estimated Play TimeAbout 1–4 minutes per puzzle

World and Mission

Mimi is restoring color to dormant puzzle boards in a magical forest workshop. Some boards contain stone cells that block parts of the grid, so the route must pass through every open cell exactly once.

The final five mastery grids combine longer routes, narrow exits, and deceptive early choices. Stage 30 completes the campaign and remains replayable.

How the Systems Work

A valid attempt begins on the glowing paw cell. Each move enters one open cell directly above, below, left, or right; diagonal jumps and repeated cells are not allowed.

The board is complete only when every open cell is colored. You may release while planning and resume later; move back over the previous cell to undo, or correct a blocked route without spending currency.

Show Hint highlights the next cell in one possible solution, while Restart clears the current route. Using a hint limits that attempt to a maximum of two stars.

Clears, unlocked stages, the stars earned on each stage’s most recent clear, and best times are stored locally in this browser. Completed stages remain available from the horizontal Stage rail.

How to Play

  1. Choose an unlocked puzzle from the horizontal Stage rail.
  2. Press the glowing paw cell and begin dragging.
  3. Move through open cells that share an edge with the current cell.
  4. Avoid every cell already colored by the route.
  5. Entering the last open cell completes the stage immediately. Before that, you can lift your finger or release the mouse; the unfinished route stays on the board.

Strategy Tips

  • Inspect corners and narrow exits before starting; entering them from the wrong direction can isolate the final cell.
  • Clear pockets with only one entrance at the correct moment instead of sealing their entrance too early.
  • Use Show Hint to reveal one next step when stuck; it never costs currency but limits that attempt to two stars.
  • Speed is not required. Pause on the current cell and plan the remaining route before moving.

Campaign and Difficulty Growth

Stages 1-5 teach orthogonal movement and the no-repeat rule; 6-10 introduce corner planning; 11-15 use stone blocks to divide the board.

Stages 16-20 extend the routes, 21-25 introduce tighter choices, and 26-30 combine large grids, blocked cells, and narrow exits.

Developer Design Note

One Line is a route-planning puzzle rather than a freehand accuracy test. Large cells and interpolated pointer sampling make the same rules practical with a mouse or a finger, while the no-repeat and fill-every-cell conditions keep success focused on reasoning. A responsive logical Canvas fills the complete safe Stage and Battle height with one uniform scale and stable anchors; this game has no bottom reserve.

Player and Save Information

One Line is a general-audience route-planning puzzle for family play. It requires no account and stores progress only in the current browser. Stars and the Result summary are playful feedback, not a formal ability, medical, or school assessment.

FAQ

Can I visit a cell twice?
No. Stepping into the immediately previous cell undoes one move and the attempt continues. Any other previously visited cell is rejected without ending the attempt.
Can I move diagonally?
No. Each move must enter an open cell that shares an edge with the current cell.
Can I let go before the board is complete?
Yes. Releasing your finger or the mouse pauses the unfinished route, which stays on the board. Entering the last open cell completes the stage immediately; no release is needed.
Do I have to move quickly?
No. You can pause on the current cell while planning.
What does Show Hint do?
It highlights the next cell in one possible complete route. Using a hint limits that attempt to two stars.
Does progress save?
Yes. Unlocks, clears, stars, and best times are stored locally in this browser.
How many stages are included?
There are 30 original grid puzzles across six five-stage chapters.

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