Mortuus supports solo or online co-op for up to 4 players on Steam, and the free demo includes co-op. Official Official Host from the multiplayer menu and invite friends through Steam. Press Points, guns and perks are personal; doors someone buys open for everyone. Press
How to host a match
- Open Play → Multiplayer → Host MatchMenu path as documented by a third-party co-op guide. Press
- Choose public or friends-onlyPick friends-only if you don’t want randoms. Press
- Invite through SteamSend invites directly or from your Steam friends list. Press
- Start once everyone is readyFriends ready up, then the host starts the match. Press
How to join
- Accept a Steam invite and ready up, or
- Play → Multiplayer → Join Match, pick a listed match and ready up. Press
Mortuus is pre-release; menu labels can shift between demo patches. If a path above doesn’t match, look for Host/Join under the multiplayer section.
What’s shared and what isn’t
| Thing | In co-op | Source |
|---|---|---|
| Points | Per player | Press |
| Guns | Per player | Press |
| Perks | Per player | Press |
| Doors bought | Open for everyone | Press |
| Downed teammates | Can be revived | Press |
| Upgrade draft | Each player picks their own | Press |
| Continue past round 25 (demo) | Team vote: “JUST ONE MORE ROUND” | Players |
Co-op tactics that follow from the rules
- Split the door budget. Doors open for all, so one player funding a door helps everyone. Coordinate who pays.
- Split roles on a fresh map. One scout hunts the red power lamp and the violet Ascension lamp while the others hold the spawn.
- Diversify Ascension. Ascension and drafts are personal — build different weapons for crowd clearing and single-target damage.
- Revive before you buy. A dead teammate is a lost gun on the line.
Split-screen, crossplay & platforms
- Split-screen / couch co-op: requested by players, not announced. Not announced
- Platforms: Mortuus is a single Steam app for Windows, macOS and Linux with full controller support. Official No console versions have been announced; see Platforms.
- Family Sharing: supported, per Steam’s feature list. Official
FAQ
How many players can play Mortuus together?
Up to 4 players in online co-op. You can also play solo.
Does the Mortuus demo have multiplayer?
Yes. The demo’s Steam page says it contains multiplayer co-op.
Does Mortuus have split-screen?
Not announced. Players have asked for split-screen/couch co-op in the Steam discussions; Steam lists online co-op only.
How do I invite friends in Mortuus?
Host a match from the multiplayer menu (public or friends-only lobby) and invite friends through Steam; friends can also accept a Steam invite or browse matches to join.
Sources
Labels: Official store page or pinned post · Dev developer statement · Players community report, not confirmed by the developer · Press coverage.
- Official Mortuus — Steam store page (app 3680170) — 2026-10-29
- Official Mortuus Demo — Steam store page (app 5363350) — 2026-10-29
- Press PlayCo-opGame — How to play Mortuus multiplayer — 2026-10
- Press gaming-st.com — Mortuus demo guide: Japanese, co-op, PC specs (Japanese) — 2026-10
- Players Community thread: "Can everyone vote to continue after wave 25?" — 2026-10-28
- Official Pinned "Mortuus | Frequently Asked Questions" — Steam discussions — 2026-10-27
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