Number Link Line Puzzle: Filum

Contains adsIn-app purchases
Content rating
Everyone
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Content rating
Everyone
In-game purchases
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About this game

Filum is Number Link, 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 – and you can reach it by logic alone.

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.

NEVER GUESS, ALWAYS KNOW
• Every puzzle is proven to have exactly one solution before it ships.
• Every board is checked by a solver that only uses steps a person can follow – no trial and error.
• Stuck? A hint shows the next safe 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, but want a real brain teaser instead of a guessing game? Filum is Number Link done properly: one certain step at a time.
Connect matching numbers and fill every cell. Pure logic puzzles, never a guess.
Updated on
5 Oct 2026
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Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region and age. The developer provided this information and may update it over time.
  • This app may share these data types with third parties
    Location, Personal info and 4 others
  • This app may collect these data types
    Financial info, App activity and 2 others
  • Data is encrypted in transit
  • Data can’t be deleted

What's new

The board plays with a keyboard and a controller.

A cell could keep a colour with no thread attached, and nothing could clear it. Fixed.

Two states of a clue never differ by colour alone any more, so the board reads without relying on colour vision.

The tutorial now opens on the rules over a solved board.
Content rating
Everyone
In-game purchases
Learn more

App support

About the developer
Yannick Krüssel
yannick@sequencode.dev
Siedlung 16 49744 Geeste Germany
+49 160 7554924