Fill Line

Fill Line is a one-line drawing puzzle where you trace a continuous path that covers every empty cell in a grid without crossing itself or lifting off. Each level is a compact maze of tiles, and the challenge is finding the single route that visits them all. Solutions are usually unique, so it becomes a logic exercise rather than a reflex test.

This title is best suited to players who like unhurried logic path puzzles.

1. Look at the grid and find a likely starting cell, often a corner.
2. Press and drag from that cell to begin drawing the line.
3. Move through adjacent cells to fill them one by one.
4. Avoid crossing your own path or leaving a cell unreachable.
5. Reverse a step by dragging back if you paint into a dead end.
6. Fill every cell in one unbroken line to solve the level.

• Press and drag: Draw the connected fill line
• Drag backward: Undo the last cells of the line

Objectives

• Cover every empty cell in the grid.
• Keep the line unbroken and non-crossing.
• Solve each level in a single continuous stroke.

The run ends or fails when

• Stranding one or more cells that the line can no longer reach.
• Being forced into a dead end before all cells are filled.

• Continuous non-crossing path drawing.
• Backtracking by dragging in reverse.
• Fixed-shape grids with a single valid route.
• Instant level validation once every cell is filled.

• Start from a corner or dead-end cell since it must be an endpoint.
• Fill tricky narrow corridors before open areas.
• Trace the route mentally before committing your drag.
• If a cell gets boxed off, undo early rather than pushing on.

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