One engine,
every game.

The core is the shared engine behind every JustAddMP mod. It does all the work that is the same in every game: it starts the game with co-op built in, connects players through Steam or by IP, runs Steam lobbies and invites, keeps the host in charge of the session, draws the co-op menus and the status overlay in the game, writes crash reports, and lets you start the game straight from Steam if you prefer.

So each game only has to add its own part: how its players, cars, missions and menus are synced. A fix or a new feature in the core reaches every game, and each game picks the core version it was tested with, so an update never breaks a game by surprise.