Is Slay the Spire 2 Crossplay? PC, Mac & Linux Co-op

Crossplay vs. Steam co-op

Mega Crit's FAQ confirms an online co-op mode and says there will be no matchmaking system: Steam friends only. The Steam store currently lists Online Co-op and Early Access availability on Windows, macOS, and Linux.

That makes Steam cross-OS co-op the supported answer for PC, Mac, and Linux players. It does not confirm console-to-PC or mobile-to-PC crossplay; Mega Crit has not published that policy. Keep the group on the same Main or Beta branch and patch when joining so the rules match.

How to start a co-op game

• For a predictable party, plan on every player having access to the game, then add everyone you want to play with to your Steam friends list. The store lists Family Sharing, but the official FAQ and store listing do not explain a multiplayer sharing exception or friend pass; verify Steam's current account rules before relying on it.
• Launch Slay the Spire 2 through Steam and choose Multiplayer from the main menu.
• One player selects Host and creates or continues a multiplayer save; the other players select Join or accept the Steam invite.
• Everyone chooses a character, then the host starts the shared climb. The game supports up to four players total.
• If you want to continue the campaign later, return to the host's multiplayer save rather than creating a new lobby.

Can Steam Deck play with PC?

The official Steam listing marks Slay the Spire 2 as Steam Deck Verified and lists Online Co-op. Use the same Steam friends, Host, and Join path as a Windows, macOS, or Linux/SteamOS player; this is a Steam-side compatibility answer, not a new console-to-PC or mobile crossplay announcement.

Before inviting the party, keep everyone on the same branch and patch: this page tracks Main v0.107.1 and the optional Beta v0.111.0. If the session fails, compare that branch choice first, then retry unmodded before treating Family Sharing or an unannounced platform as the cause.

How multiplayer runs work

The party moves through one shared map, but players keep their own decks, relics, potions, gold, and Energy. You can all choose the same character, so the important decision is whether the team has enough damage, Block, draw, and support rather than simply avoiding duplicate characters.

Enemies are shared threats and their scaling depends on party size. Everyone acts during the same party turn, so agree on card order, target priority, and when someone needs support before ending the turn.

The Steam store describes multiplayer-specific cards and team synergies. Some cards and potions can affect another player, which makes deck inspection and short voice or text callouts useful.

If a friend cannot join

• Check the branch first: everyone should be on the same branch and patch. This page tracks Main v0.107.1 and Beta v0.111.0; do not mix a default Main install with an optional Beta install when testing the same save.
• Confirm the host and joiner are Steam friends, then retry through Host and Join. Mega Crit's FAQ does not provide a public matchmaking queue to bypass that relationship.
• If anyone has mods installed, first retry with everyone unmodded. Beta v0.111.0's official notes include fixes for modded/unmodded save-directory handling and a multiplayer crash; record the branch and mod state if the failure remains.
• If the group is trying to share one account or Family Sharing access, treat simultaneous co-op as unverified: Steam lists Family Sharing, but the store listing and Mega Crit FAQ do not define a multiplayer sharing exception.
• Local co-op is not a fallback: the Steam listing shows Online Co-op, not Shared/Split Screen Co-op or Remote Play Together.

What to know about saves and joining

The host owns the multiplayer save. The current co-op guides report that all players should be present from the beginning and that a different friend cannot simply replace an abandoned slot halfway through a campaign.

Before starting a long run, agree on who will host and how you will resume it. If the host disconnects, save and quit to the menu, then have the host re-host the same save before inviting the group again.

What to agree on before a run

• Use the same Main or Beta branch so card text, balance changes, and fixes match for everyone.
• Decide whether mods are allowed and keep gameplay-affecting mods identical; if a session fails, test everyone unmodded and record the branch and mod state.
• Choose a simple team plan: who is scaling damage, who is covering Block, and which player gets priority for support effects.
• Set a route decision rule before the first map choice. The route is shared, while gold, cards, and most rewards are handled per player.
• For a reproducible bug report, record the branch, version, party size, character lineup, enabled mods, and the turn where the state diverged.

Is there local co-op?

The Steam store currently lists Online Co-op, not Shared/Split Screen Co-op or Remote Play Together. Neither the store page nor Mega Crit's FAQ announces a local mode, so do not promise couch co-op unless an official listing changes.

Can PC, Mac, and Linux play together?

Yes: Windows, macOS, and Linux/SteamOS players are on the current Steam distribution and can use Steam Host and Join. Use the same branch and patch version for a predictable session. This is the practical PC crossplay answer today; console and mobile multiplayer, account linking, save transfer, and crossplay rules remain unannounced.

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