Is Sandustry multiplayer? Officially, no — Sandustry is a single-player game with no co-op mode, and the developers have not announced any multiplayer plans. But there is a catch: the community-built Fluxloader tool adds non-official online co-op, where one player hosts a world and a friend joins with a room code. Here is exactly where things stand.
Official multiplayer status: none
Sandustry has no official multiplayer, co-op, or online mode. This is a deliberate design choice, not an oversight:
- Single-player by design — the developer built the game for one player to avoid the extreme technical challenge of networking a fully simulated, pixel-based physics world.
- No plans announced — as of the August 2026 Early Access launch, the developers have not announced any multiplayer features.
- The official wiki agrees — the official Hooded Horse wiki has a "Multiplayer" page, but it is empty (no content has been published for it).
Players on the Steam Community Discussions ask for co-op repeatedly, but community members note that official multiplayer is unlikely unless the core simulation becomes deterministic.
How to play co-op anyway: Fluxloader
The community built a tool called Fluxloader (found at fluxloader.app) that manages mods and adds online co-op. Here is how it works, in Fluxloader's own words:
Together Online co-op for Sandustry, via Fluxloader. One player hosts, another joins with a room code. Both dig and build in the host's world.
The steps are simple:
1. Install Fluxloader
Grab Fluxloader from fluxloader.app. It is the same tool most guides recommend for installing mods, so you are not adding a second launcher.
2. One player hosts
The host starts a world in Sandustry through Fluxloader. The world lives on the host's machine.
3. A friend joins with a room code
The second player enters the room code the host shares, and you both dig and build in the host's world.
For full details on installing Fluxloader and what else it does (Steam Workshop mods, custom maps, the demo vs. the full game), see the Sandustry Mods page.
Frequently asked
Is Sandustry multiplayer?
No. Sandustry is single-player only, with no official multiplayer or co-op mode, and no plans announced as of the August 2026 Early Access launch.
Is there any way to play Sandustry co-op?
Yes, unofficially. The community Fluxloader tool adds online co-op: one player hosts, another joins with a room code, and you both build in the host's world. It is a community tool, so expect bugs.
How do I play with friends?
Install Fluxloader from fluxloader.app, have one player host a world, and have the others join with the room code the host shares.
Will Sandustry ever get official multiplayer?
Unknown. The developers have not announced any multiplayer plans. Community members note that official multiplayer is unlikely unless the core simulation becomes deterministic, so the game is single-player for the foreseeable future.
Does co-op work across platforms or with more than two players?
Not confirmed. Fluxloader's own description only says "one player hosts, another joins," so cross-platform and player-count details are not documented. Treat anything beyond two-player co-op on the same platform as unverified.