The joy of figuring it out

Simple rules.
Puzzles that make you think.

A wall that closes a passage. A direction that changes everything. Varied grids where the right route may take a few attempts to reveal itself.

  • One continuous line

    Begin at the starting point and visit every playable cell, without visiting any twice.

  • Walls to work around

    A blocked passage sends you looking for a different route.

  • A direction to follow

    Directional constraints change the shape of the path you need to find.

Retrace your line and try another route. Each grid is a small problem waiting to be solved.

Your daily rendezvous

Have you tried today's challenge?

A timed series of puzzles. A result to improve. And a shared challenge to compare with friends.

Choose your own goal: finish the series, improve your time or earn platinum. The leaderboard adds another target for anyone who enjoys a little competition.

Start playing

New to One Line? Start with the welcome screen, then find the Daily Challenge in the game.

A local example of the Daily Challenge result screen, showing the series time and earned medal.
Local example from the June 17, 2026 challenge

Ready for another?

Finished today's challenge already?

Find earlier challenges in the calendar and keep solving. Thousands of past challenges are available, so you don't have to wait until tomorrow.

The in-game calendar lets you select a past date to revisit its Daily Challenge.
Earlier challenges, from the in-game calendar

Worlds to complete

The satisfaction of finishing every world.

Discover a mechanic, learn its twists and savour that final grid in a world.

The Classic pack offers 300 levels of increasing difficulty, from Easy to Expert. The Labyrinths pack adds 150 puzzles built around walls and paths to explore.

Gold and platinum stars mark your progress. Move on to the next world, or return to find a better solution.

Explore the puzzles
The in-game worlds and their progress, as shown in a local demonstration game.
Worlds to explore · a look inside the game

A change of pace

Against the clock. Or with friends.

Rush

Beta

How many grids before time runs out? Solve puzzles for 60 seconds, improve your record and see how you compare on the leaderboard.

Multiplayer

Beta

Challenge your friends with 2 to 5 players. Share an invitation, start a round and get ready for a rematch.

These modes are still in development. Opt in through the game's beta program to access them.

Before you begin

A few useful details.

Where can I play?

In your browser on a computer, tablet or phone, or on Android with the Google Play app. Choose whichever suits you.

Can I play the campaign offline?

Yes, once the game and its resources have loaded on your device. The campaign and your progress remain available offline. Leaderboards, synchronization and multiplayer need an internet connection.

Do I need an account?

You can start without one: progress is saved on this device. An account lets you sync it across your devices.

How do I access the beta modes?

Turn on the beta program in the game settings to discover Rush and multiplayer. An account is required to create a multiplayer room; an invitation lets you join as a guest.

Your starting point is waiting

Find your next challenge.

Play now Google Play

Created in Quebec by Maxime Manseau, an independent developer.
A question or some feedback? Get in touch.