Core Keeper is a gem of a co-op mining sandbox. You and your friends have been digging deeper into the caverns, fighting bosses, farming underground crops, and illuminating the vast darkness tile by tile. But the save file is on the host’s machine, and when they are not around, the entire underground world is sealed shut.

SaveSync breaks open that seal and gives every player in your group the ability to host and continue the adventure.

The Underground Lockout

Core Keeper supports up to eight players in co-op, but the world save is tied to whoever created it. When friends join your session, they bring their characters into your world but do not receive a copy of the save. Once the host goes offline, the world is gone until they come back.

For a game about gradual exploration and incremental progress, this is especially frustrating. Every session you spend digging tunnels, farming resources, and placing walls adds to the world. Missing sessions does not just pause progress - it breaks the rhythm that makes Core Keeper so satisfying.

How SaveSync Keeps the Caverns Open

SaveSync shares your Core Keeper world save with every member of your co-op group. When a session wraps up, the host syncs the save. The next person who wants to play pulls the latest version and hosts the world themselves.

Your farms keep growing. Your explored caverns stay lit. Your boss progress carries forward. The underground world belongs to the whole group, not just one player.

How to Set Up SaveSync for Core Keeper

  1. Install SaveSync from Steam.
  2. Create a sync group and invite your mining crew via Steam.
  3. Select Core Keeper and configure the save file path.
  4. Sync after each session to upload the latest world state.
  5. Any group member can host by pulling the latest save and starting Core Keeper.

For a detailed walkthrough, check out our Steam guide.

Why Use SaveSync Instead of Alternatives?

vs. Dedicated servers: Core Keeper does not offer built-in dedicated server support for most players. Even with workarounds, setting up persistent hosting adds complexity and cost that casual co-op groups do not need. SaveSync gives you persistent access to your world without any server management.

vs. Manually sharing save files: You could locate the Core Keeper save files and send them through Discord or a file sharing service, but keeping track of which version is current across multiple players gets confusing fast. One person loading a stale save can undo hours of mining and building. SaveSync automates this entirely.

vs. Playing only when the host is available: Core Keeper sessions can be short and productive. Sometimes you just want to log in for thirty minutes to tend your farm, smelt some ore, or explore a new section of the cavern. That should not require the host to be free at the exact same time.

Dig Deeper, Together

Core Keeper is a game about patience and persistence. Every tile you dig, every wall you place, and every crop you plant contributes to something larger. SaveSync makes sure that collective effort is always accessible, so your underground civilization keeps growing no matter who logs in.