Official player count
Two players are enough to use the supported range, and four is the published maximum. Public material does not document a different maximum for individual simulations. Claims that a particular group size is objectively best remain opinion until supported by repeatable play evidence.
Online and local options
Steam currently lists Online Co-op, Shared/Split Screen Co-op, Shared/Split Screen, and Remote Play Together. These labels confirm both networked and local routes. Exact controller allocation and per-minigame local differences are still unconfirmed.
Matchmaking boundary
The v1.5.0 developer statement says public matchmaking and a lobby list were not part of the base-game design. The official response was to point players toward an LFG community. This site links the stable Steam Community route until a direct official invite can be verified.
Community expansion
MachineParty+ adds a community server browser, voice chat, text chat, and moderation according to its original GitHub repository. Public lobbies and Mod chat require the Mod, while the repository describes compatibility with vanilla private sessions. Those are community capabilities, not official Steam features.
Source register
Claims on this page are limited to the sources below. Missing details stay marked as unconfirmed instead of being reconstructed from similar games.