Fill Line: Cover Every Cell

The pitch

Fill Line is a calm one-stroke logic puzzle. Start from the marked cell and draw one continuous line that fills every block on the board. You can't visit a cell twice, and there are no diagonal moves. It sounds simple, but the boards grow with every chapter and the solutions get trickier. The game has over 1,000 levels in 41 chapters. Each chapter has its own color theme, and the difficulty rises smoothly: easy breather levels alternate with hard ones, and a boss level waits at the end of every chapter. New mechanics appear along the way: double blocks you have to cross twice, bridges where the line crosses itself, and arrows that set the direction. A new daily puzzle with a reward opens every day. Spend coins to unlock themes, each with its own sound. There are no timers, no lives and no game over — just logic and the satisfying sound of filling cells.

Controls & how it runs

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.

Getting a run going takes exactly one press: Press start, up top, and the game boots inside this page — nothing downloads in the background and no form wants your details before the first jump. The cabinet is drawn for a flexible screen and listens to mouse, keyboard or touch, whichever the game prefers. It reshapes itself for tall and wide screens alike, so phone, tablet and desktop all get the full picture. Given a fullscreen button, use it — scores look better at full size, that's just science.

Pro tips for arcade cabinets

• Treat your first run as a scouting mission. Arcade cabinets hide their cruelty in the second minute, not the first — learn where the difficulty spikes before you start chasing numbers.
• Small scores compound. Grab the easy pickups on every pass instead of gambling the whole run on one heroic line; heroes respawn, banked points don't evaporate.
• Watch the edges of the screen. In classic arcade design the next problem almost always enters from somewhere you weren't looking — build the habit of scanning the borders.

Fill Line: Cover Every Cell — quick-fire questions

Does Fill Line: Cover Every Cell cost anything to play?

Not a token. The cabinet is free from the first run to the five-hundredth — no wallet, no sign-up, no toll booth hiding three levels in. The adverts around the page are what keep the floor's lights on.

What sort of game is Fill Line: Cover Every Cell?

It stands on our Arcade row — that's the family it plays most like. The pitch above is the publisher's own rundown of what it throws at you and what it hands back.

Can I play Fill Line: Cover Every Cell on my phone?

Happily, yes. It runs inside the browser on phones and tablets the same way it does on a computer. It reshapes itself for tall and wide screens alike, so phone, tablet and desktop all get the full picture.

Do I need to install anything first?

Nothing whatsoever. Fill Line: Cover Every Cell is an HTML5 game: hit the start button and it boots on this page, and shutting the tab sweeps the cabinet clean behind you.

Before you wander off

Personal best banked, or still chasing it? Either way the full Arcade row is powered on and waiting — The main floor: 415 cabinets of pure arcade stock — the quick, the loud and the gloriously unfair. If it beeps, flashes and dares you to beat a number, it lives on this row.