The game's been written for private use, so no lobby/authentication etc.

Use node -r esm src/server.js to start the server, npm start to start the game (https://boardgame.io/documentation/#/multiplayer?id=remote-master).

Use ?id=X, where X is from 0 to <number of players> - 1, URL param to choose the player number (e.g. http://localhost/?id=0).

The number of players can be configured in src/index.js, the number of words and turn duration in src/game.js.