Core Keeper is a co-op sandbox adventure featuring exploration, resource gathering, base building, and boss battles. On your own server, your group can keep playing in the same persistent world and save progress together.
Save files are especially important in Core Keeper because worlds grow over many hours of play. You can upload an existing save, download your progress, or back up your world. Difficulty also determines how relaxed or challenging your server will be.
The connection guide helps players join your server quickly and continue playing together.
At 4Netplayers, you can rent your own Core Keeper server and configure it to suit your group. This wiki supports you with save files, difficulty, and connecting to the server.