Remote Play Together
Play Pathogenic Diatom co-op online with Steam Remote Play Together: setup, latency tips, input sharing, and host requirements at 1.0 launch.
Why Remote Play Together Matters
Pathogenic ships local split co-op through the Diatom pathogen at version 1.0, but there is no dedicated online matchmaking server. Steam Remote Play Together bridges that gap: the host runs the game, streams video to friends, and forwards controller or keyboard input so a second player controls half of the Diatom body over the internet.
Only the host needs to own Pathogenic on Steam. Up to four remote guests can join depending on connection quality, though Diatom co-op uses one partner in practice. Remote Play is free for all participants and works across Windows, macOS, and Linux clients when the host platform supports streaming for the title.
This is the officially recommended way to try Diatom with friends who are not on the same couch. Latency is higher than true netcode, so treat Remote Play sessions as cooperative practice rather than leaderboard attempts.
How to Start a Session
Launch Pathogenic, open your Steam friends list, right-click the game, and choose Invite to Remote Play Together. Alternatively, start a Diatom run from the pathogen select screen and use Shift+Tab to invite friends from the Steam overlay while the lobby is idle.
Assign inputs deliberately: player one typically uses mouse and keyboard for the left half while player two uses a gamepad for the right half, matching the layout Aberrant Labs demonstrated in dev logs. Both players can share one keyboard only if you enable shared input in Remote Play settings, but separate devices reduce accidental movement conflicts.
Before entering Skin, agree on communication for dodge timing, editor Tab pauses, and Antibiotics tier. Host-selected difficulty applies to the entire party. Confirm both players see the same daily seed text if you are attempting a seeded daily in co-op.
Latency, Audio, and Troubleshooting
Remote Play quality depends on upload bandwidth and ping. Wired Ethernet on the host side helps more than guest-side Wi-Fi upgrades. Lower stream resolution in Steam Remote Play advanced settings if input lag exceeds two hundred milliseconds—Diatom coordination breaks when halves move out of sync during T-cell beams.
Voice chat through Steam overlay or Discord is strongly recommended. Diatom drag mechanics mean one half pulling while the other dodges can wedge the pathogen into Intestine villi or Lung airflow. Call dodge direction before boss telegraphs.
If input drops, restart Remote Play from the host game rather than mid-fight. Save-and-continue runs let hosts pause between organs to reconnect guests after disconnects. See our co-op Diatom guide for combat roles and our save continue guide for interrupting long sessions safely.
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Frequently Asked Questions
Does Remote Play require both players to own Pathogenic?
No. Only the host needs a Steam library copy. Guests join through Steam Remote Play Together.
Can Remote Play work for solo pathogens?
Yes, but it is designed for local co-op titles. Diatom is the primary use case because two players share one pathogen body.
Is Remote Play supported on Steam Deck?
Steam Deck can host or join depending on network conditions. Lower stream quality for stable input on cellular hotspots.