The server browser is sparse but dedicated. Look for servers labeled "Co-op Sandbox" or "Hardcore Survival." Due to the game's niche status, peak hours are typically weekends (UTC evenings). If you find a good server, add the admin to your friends list; the Take On Mars community is small, welcoming, and ferociously helpful.
While co-op is the star, the game offers a hidden gem: . take on mars multiplayer
