Gameplay KSA Multiplayer

[Laurens]

KSA Multiplayer

A shared world for Kitten Space Agency: several players, each in their own game, flying in one universe kept by a dedicated server. The server runs on Linux, Windows or a Raspberry Pi, needs no copy of the game, and holds the world whether anybody is playing or not.

Any craft syncs: rockets, rovers, kittens walking about on EVA. You see other players fly, stage, burn and crash in real time, each craft carrying its owner's name.

Playing together

• A craft is its owner's. You can watch one somebody else is flying, ride along with it, and see its engines burn — but not take it, board it or empty it out. When its owner leaves, it comes free.
• One clock. Everybody keeps the server's time. A game that falls behind catches up on its own, and nobody is left watching a world minutes out of date.
• Time warp is asked, not taken. Changing the simulation speed is put to the room first, and only whoever asked can end it. A game that cannot keep up holds the speed down for everyone, so nothing runs away from the slowest machine.
• Hold Tab for who is playing and their ping, Enter for a chat line.
• Launchpads are shared out, so two players launching at one site do not land on top of each other.

The server

One self-contained executable. Point it at a port and it waits; the first player to join gives it their world, and it hands that world to everyone who joins after. Or set empty-world and it starts with an empty one of its own, so nobody has to seed it.

It keeps the world between runs, saves periodically, and has a console: clear sweeps up the spent stages a shared world fills with, reload hands the world out again without anybody reconnecting, and fresh throws it away and starts over. Players can be made admins and run those commands from inside the game.

There is a server at mp.ksarmory.com to try it on.

Installing

1. Install StarMap 0.5.3 or later.
2. Take the zip from the releases page, unzip it into KSA's mods folder and enable it.
3. Load a world and get into flight. The Multiplayer window is at the top right, and the start screen can join a server before the world even loads.

Hosting is the same download: ksamp-server-win-x64.zip for Windows, a tarball for Linux and ARM, or a container image. The machine you play on can host.

What you need

Everyone in a world needs the same KSA build, the same mod version, and every mod the world's craft use. The server turns away anyone who differs and says what is missing, rather than letting a mismatch corrupt the world quietly. This release is built for KSA 2026.11.10.5801.

Honest status

Two games on one machine have flown in one world through all of this: launching, EVA, chat, nametags, a voted warp, and an 89-part rocket staged while the other game watched and rebuilt the dropped stage as its own craft. Another player's engines are seen to burn even on a craft your game is not simulating, thousands of kilometres away.

What a dozen players across the internet do to it is not known yet. Bug reports are very welcome — that is mostly what this thread is for.

Links

• Source and releases
• Bug tracker
• MIT licensed.