Fill Line: Cover Every Cell

About Fill Line: Cover Every Cell

Fill Line: Cover Every Cell is a thoughtful puzzle game that invites players to create a continuous path covering every square on a grid. Starting from a marked cell, you draw a line through adjacent cells without retracing steps or moving diagonally. As you advance, the puzzles introduce new challenges such as blocks needing to be crossed twice, directional arrows that restrict movement, and bridges that overlap without turns. With hundreds of levels organized into chapters, the gameplay balances simpler puzzles with more complex ones, all set at a calm and relaxing pace. The absence of time limits or penalties encourages careful planning and a focused approach, making this game an ideal choice for fans of logic puzzles and brain-training challenges.

How to Play

Start from the marked cell: it is already filled and pulses. Without lifting your finger or the mouse button, draw the line through neighboring cells up, down, left or right. The goal is to fill every block on the board with a single line.

Made a mistake? Drag the line back to undo steps, or tap any cell of the line to continue from there. The Undo button removes the last step, and Restart begins the level again. If you get stuck, tap Hint and the game will show the next steps.

Special cells: a block with a ring must be crossed twice; a bridge is crossed once vertically and once horizontally, and you can't turn on it; an arrow can only be passed in its direction.

On a computer: arrows or WASD — step, Z or Backspace — undo, R — restart, H — hint, Esc — pause.