Pontis
Hashi (Bridges)
Independent game studio · Germany
Logic puzzles for your phone and your browser.
SEQUENCODE is a one-person studio. Every game is written once in Flutter and Dart and ships as an Android app and as a full web version — and the web versions are free to play on Solvarium.
Solvarium
32 puzzle games, free in your browser
Solvarium is where every SEQUENCODE game lives on the web: the same games as the apps, nothing to install, in 27 languages.
Open SolvariumAn account if you want one
Trophies, leaderboards and a player profile — or just start playing, no sign-up needed.
A daily puzzle
One new board every day, the same one for everybody.
27 languages
Every game and every rule sheet, in 27 languages.
Exactly one solution
A solver checks every board before it ships.
Games
The games
Each one is a classic logic puzzle, built out into a full game with a campaign, a daily puzzle and endless boards. All of them play in the browser; four are also on Google Play.
Also on Google Play
Cella
Heyawake
Census
Kurotto
Filum
Numberlink
Polus
Spiral Galaxies
27 more in the browser
On the webTentorium
Tents Puzzle
On the webEffigies
Nonogram
On the webMusivum
Mosaic Puzzle
On the webMurus
Tapa
On the webSulcus
Slitherlink
On the webCuneus
Shakashaka
On the webLucerna
Akari (Light Up)
On the webUnio
Masyu
On the webInsula
Nurikabe
On the webDecussis
Kakuro
On the webGradatio
Futoshiki (Unequal)
On the webPuncta
Kropki
On the webSaeptum
Calcudoku (Mathdoku)
On the webSagitta
Yajilin
On the webCornu
Nurimisaki
On the webClassis
Battleships (Ship Puzzle)
On the webAgmen
Straights (Number Runs)
On the webBini
Binary Puzzle
On the webClivus
Slant (Gokigen Naname)
On the webModulus
Shikaku (Rectangles)
On the webSolus
Hitori
On the webTessera
Suguru
On the webTurris
Skyscrapers
On the webVestigium
Number Path
On the webConspectus
Kurodoko (Kuromasu)
On the webMensura
Fillomino
On the webDuplex
Norinori
How it's built
One codebase, two platforms
Every game is a Flutter app. The same Dart code becomes the Android app and the web version, so a fix or a new puzzle reaches both at once.
- 01
Flutter & Dart
One codebase per game, compiled for Android and for the web, with Material 3 Expressive throughout.
- 02
A shared shell
Menus, the daily puzzle, achievements, settings and all 27 languages are written once, in a package every game builds on. A game only adds its puzzle.
- 03
Solvers and generators
Every puzzle has its own solver and generator in Dart. Boards are generated, rated by difficulty and kept only when they have exactly one solution.
- 04
The web around it
This site and Solvarium are built with Astro and TypeScript and run on Firebase — Hosting, plus Authentication and Firestore for accounts and leaderboards.
What I work with
Favourite
Flutter & Dart
My favourite framework and language: quick to build with, one codebase for phone and browser, and a UI toolkit that makes Material 3 a pleasure.
Before and alongside Flutter I've built with JavaScript and TypeScript, and on the web with Vue and Angular.
About
Who's behind this
01
Solo project
I run SEQUENCODE as a solo project. This means I take full ownership of the entire process: from the initial code architecture and user interface layout to the level design and final quality control.
02
7 years of code
What started seven years ago as hobby programming has evolved into a serious passion. Over these years of building things, I've learned that games feel best when they are focused, finished properly, and kept clean.
03
Phone and browser
A puzzle should be there wherever you are. That is why every game is built for both: the app on your phone, the full game in any browser.
Contact
Get in touch
Bug reports, refund questions, privacy requests and anything else — it all goes to the same address.