Can I join random players in-game?
No. There is no matchmaking as of March 7, 2026.
No. As of March 7, 2026, Slay the Spire 2 co-op is Steam friends only and does not include matchmaking.

No. Slay the Spire 2 does not have matchmaking right now.
Mega Crit's official FAQ says co-op is Steam friends only. That is the clearest possible answer, and it is the one most groups want before they try to set up a run.
Verification note
Directly based on Mega Crit's official Steam FAQ and checked against launch-week community discussion.
Before your next co-op run
Co-op questions usually start with one clean rule: can you do it, how do you set it up, and what counts for progression.
From there, the related links help your group move into matchmaking, unlocks, team comps, and any update that changes multiplayer play.
Get the direct co-op answer first, then branch into party strategy.
Follow the linked guides if the co-op question affects unlocks, class choice, or role division.
Check the update pages if co-op rules or progression details change.
The official Steam FAQ answers the question directly: there is no matchmaking, and co-op is Steam friends only. That means players need a pre-made group instead of relying on public lobbies.
Community launch-week discussion on Steam repeats the same answer, which is useful secondary confirmation for players who arrive through question threads rather than the FAQ itself.
Players who hoped to treat co-op like a public queue game should plan around that limitation. The current co-op feature is about playing with people you already know, not about discovering strangers in-client.
In practice, this makes the page useful because the answer is stable, direct, and easy to share with a group before a run starts.
Once readers know there is no matchmaking, the next questions are usually how to invite friends, whether everyone needs a copy, and whether co-op can unlock characters. That is why this page sits next to the rest of the co-op cluster.
More co-op answers
FAQ
No. There is no matchmaking as of March 7, 2026.
Yes. The limitation is not online play itself; it is that the online play is currently friends-only through Steam.
Because it changes how your group plans to play. Friends-only co-op is very different from being able to jump into random public lobbies.
Sources
Mega Crit release date trailer post
OfficialOfficial summary of the launch date, the five-character roster, and co-op support.
Official Steam FAQ
OfficialPinned by Mega Crit. Confirms the launch time, price, platforms, Steam Deck support, and early access range.
Steam thread: matchmaking
CommunityCommunity thread quoting the official FAQ answer that co-op is Steam friends only and has no matchmaking.