Lobbies · Patch 1.0.4
Moon Sweepers multiplayer not working
Moon Sweepers multiplayer is a host lobby of up to 16 players, not a dedicated server, and the store page lists no cross-play. Everyone needs patch 1.0.4, because saves from that build do not open in older ones. If you were banned, the host clears it under ESC, Your Crew.
| What you see | Likely reason | Fix | Status |
|---|---|---|---|
| Friends on 1.0.3 cannot open a 1.0.4 world | Saves from 1.0.4 do not open in older versions | Everyone updates before the invite | Official, 1.0.4 |
| A banned friend cannot rejoin that save | Host ban sticks to the save | Host opens ESC, Your Crew, and unbans them | Official, 1.0.3 |
| Dust you cleaned reappears for someone else | Ground sync was a known fault | All on 1.0.4, which reworked ground sync, including robot trails | Fixed in 1.0.4 |
| A crewmate's splitter does nothing | 1.0.3 said crew-built splitters and mergers failed | Update. 1.0.4 also lets anyone place them on another player's belt | Fixed across 1.0.3 and 1.0.4 |
| You expected a server browser | There isn't one in the published feature list | Join the host's lobby or a friend invite | Store, no dedicated server listed |
- 1Match the build
1.0.3 already said the whole crew must be on that version to play together. 1.0.4 adds a harder rule: its saves do not open in older versions.
Official - 2Check the host's crew list
ESC, Your Crew. A ban blocks that save only. The host can unban there.
Official, 1.0.3 - 3Invite from the host, not from a second menu you hoped was a server
Use the in-game lobby and Steam friends. There is no published dedicated-server toggle.
Store plus the absence of a server note - 4If the invite never arrives, check the local firewall
Allow Moon Sweepers on the host's private network. This is general Windows practice. The patch notes do not name a port.
General practice
Questions
- Is there a dedicated server?
- Not as a store feature, and not in the 1.0.3 or 1.0.4 notes. Someone has to host. If that person leaves, the session goes with them.
- Does cross-play exist?
- The store page checked on 26 Oct 2026 lists Windows, online co-op, and no console or cross-play flag.