One universe.
Everyone in it.

A multiplayer world is simulated in one place: the server. It runs the same physics engine as single player, every tick, for every craft, station and piece of debris. Players send their controls; the server decides what happens; everyone sees the same result.

That is why a shared world stays consistent. The station your friend built is in the orbit physics says it is in, whether you look at it from next door or from the other side of the planet. On a dedicated server the world keeps going while you are away, and it is still exactly where it should be when you come back.

The shared world always runs in real time, so nobody's warp speeds up or holds back anyone else. When you warp, your craft flies ahead on your own machine and the others see it as a see-through ghost. Press SYNC and your craft rejoins the shared clock in the same orbit around the body it is near.

Hosts can bring everyone back at once with SYNC EVERYONE.

Fly to a friend's station and dock with it. Chat from flight or from the builder. Open the Players page to spectate anyone's flight. When the host allows teleporting, GO TO takes you straight to a friend, and hosts can summon players to them. Ride along as a passenger on another player's craft and ask the pilot for the controls. Craft left behind by a player who logged off can be taken over, if the host allows it.

• Chatin flight and in the builder
• Dockingwith other players' craft and stations
• Spectateany player's flight
• Ride alongas a passenger, then ask for control

Interstellar travel is always available in multiplayer. Players spread across the galaxy appear on the galaxy map, and spectating works across star systems. When the host allows teleporting, GO TO and launching to another star work too. A crossing between stars runs on your machine and rejoins the shared world at SYNC.

Open MULTIPLAYER, choose HOST A WORLD and pick one of your Sandbox worlds. The game runs the server for you and shows a room code in the pause menu. Friends enter it under JOIN A FRIEND. No port forwarding is needed: players connect directly when their network allows it, with a relay as the fallback, and the HUD shows the route and ping.

Hosts and co-hosts set the rules: teleporting, drills, bombs, taking over abandoned craft, and cheats such as infinite fuel. They can also kick, ban, freeze and clear debris. Mods selected for the world are sent to players when they join.

Before hosting, the CONNECTION TEST checks your network, the relay and direct connections.

The dedicated server hosts a world without anyone playing on it. It needs no display or graphics card, runs on Linux x64 and ARM64, keeps rotating backups and comes back on its own under a service manager. The first player to join becomes its owner.

./RocketFoundry.Server --save "My World" --new --room

It prints a room code to share. Add --allow-teleport, --allow-drills or --cheat fuel to set the rules, and type commands such as players, say or save while it runs. The download includes a README with tmux and systemd recipes.