Moon Sweepers Multiplayer: Host, Join & Share Upgrades

Start or join a crew

The host starts the intended save and selects the desired lobby visibility in the game. Use a friends or invite setting for a known group.
Friends join through the available Steam/game lobby or invitation entry. Check that each player has updated before troubleshooting connectivity.
Once everyone is in, confirm the host’s world and upgrade state. Do not expect a different solo save’s matrix to replace the host’s matrix.

Shared matrix does not mean shared ownership of everything

The official 1.0.3 rule is precise: the whole crew uses the host’s upgrade matrix and anyone’s purchase applies to everyone. Older saves retain the highest previously purchased level. Tools, personal equipment and vehicle ownership should not be treated as duplicate copies of the matrix.

Agree on the next bottleneck before spending shared funds. One player can sweep, another move material and another build; sixteen people buying unrelated improvements can delay the first working line.

Host controls and public games

Esc → Your Crew gives the host kick and ban controls. A ban prevents the player rejoining that save until the host unbans them. Patch 1.0.5 adds a warning before creating or switching to a public crew explaining what other players can do and where moderation controls live.

When co-op looks broken

Issue	First useful check
Cannot join	Everyone updated; correct host lobby and visibility.
Clean ground reappears	1.0.4 reworks ground synchronization.
Cannot attach to a crewmate’s belt	1.0.4 enables shared splitter and merger building.
Different upgrade expectations	The host matrix governs this crew.
Teleport launches someone away	1.0.5 fixes a station teleport interaction launching a player below the traveler.

Open crash, save and input fixes →

Sources & version notes

Checked 29 October 2026. Official patch behavior is separated from community-reported menu values. This guide is source-based; it does not claim an in-game test by this site.