This game is also known among Vietnamese people as Tiến lên. The project is a online multiplayer implementation of the game.
Thirteen is a learning experience for web and backend development. The backend websocket server uses Rust while the front-end uses web technologies such as Pug/SCSS/TypeScript.
The rules for the game can be found on the Wikipedia page. There are some variations to the rules but the core of the game is faithful to the original rules.