Filum · Free in your browser
Numberlink Line Puzzle: Filum
Connect every pair with one thread
Number Link puzzles: connect matching numbers, fill every cell. Plays offline.
The rules
- Connect every pair of ends with the same number by a single unbroken thread.
- A thread never crosses itself or another thread. Every cell carries at most one thread.
- Every single cell on the board belongs to some thread by the end — none is left empty.
How to play here
Press a numbered end and drag to extend its thread. Drag back over your own thread to shorten it.
Three ways to play
Campaign
Chapters that start gently and bring in one new idea at a time.
Daily puzzle
A new board every day, the same for everyone. Solve every one in a month and that month's trophy is yours.
Endless
Keep going as long as you like, in Easy, Medium, Hard and Expert.
About the game
Filum is Numberlink — also called Number Link or Arukone — the classic pencil-and-paper line puzzle: connect matching numbers with one unbroken line, fill every cell of the grid, and never cross another line. Every puzzle has exactly one solution.
How to play
- Drag from a number to its twin to draw a line between them.
- Lines run across and down. They never cross and never branch.
- A puzzle is solved when every pair is connected and every cell is filled.
Exactly one solution
- Every puzzle is proven to have exactly one solution before it ships.
- Stuck? A hint shows the next move and tells you why it follows.
- A short interactive tutorial teaches the rules and the first tricks on real boards.
All offline, no account
- Campaign: 12 chapters and 360 levels, from a relaxed 6x10 grid to a 12x18 expert board.
- Daily puzzle: a new puzzle every day, the same for every player worldwide.
- Endless mode: easy, medium, hard and expert – play at your own pace.
- No internet, no account and no login needed.
A trophy for every month, no streaks
- Solve every daily puzzle of a month to earn that month's trophy.
- Missed a day? Catch up from the calendar at any time. Nothing resets.
Calm, clean, made for logic fans
- Lines look like pencil on paper and are matched by number, not by colour – just like the original Numberlink.
- Undo, redo, and pinch to zoom on the big boards.
- Material You design in light and dark themes that picks up your wallpaper colours.
- Optional daily reminder.
- Google Play Games: cloud save, achievements and leaderboards.
Free and fair
- Free to play with ads. A single one-time purchase removes all ads and unlocks unlimited hints.
- Hint packs for an occasional top-up, free hints for watching an optional video, and a free hint pack for sharing Filum once.
- The daily puzzle and its archive are free for everyone, with no ads between puzzles.
- Every puzzle can be played without paying.
Love connect-the-dots and pipe puzzles? Filum is Numberlink the way puzzle magazines print it: numbers, a pencil line and nothing else.
Common questions
Is Filum free?
Yes. You can play here without paying and without an account. Ads keep the lights on.
Where is my progress saved?
In this browser, on this device. If you clear the site data, your progress goes with it. A free Solvarium account keeps it safe.
Does it work on a phone or tablet?
Yes. It runs in any current browser on phones, tablets and computers, and the board resizes to fit the screen.
Does every puzzle really have one solution?
Yes. Every board goes through a solver before it ships, and anything with more than one solution is thrown out.
Is there a Filum app?
Yes, on Google Play for Android. The app works offline, can remind you about the daily puzzle and collects achievements in Google Play Games.