Slay the Spire 2 brings one of the most requested features in the franchise’s history to life: fully playable online co-op for up to four players. Whether you want to climb with friends or divide roles across a full party, here is everything you need to know about how co-op works in Slay the Spire 2.
Does Slay the Spire 2 Have Multiplayer?
Yes, Slay the Spire 2 supports online co-op for up to 4 players. This is a brand-new feature that was never part of the original game, and it represents one of the biggest changes the sequel brings to the formula. However, co-op in Slay the Spire 2 is online only with no local or couch co-op available at launch.
What You Need to Play Co-op
Before jumping into a run with friends, here is what every player needs:
- Every player must own a separate copy of Slay the Spire 2 on Steam. There is no shared access or game share option.
- Co-op runs through private lobbies only. There are no public matchmaking sessions, so all players need to be on each other’s Steam friends list to send and receive invites.
- The host creates the lobby and sends invites to friends directly through Steam.
How to Start a Co-op Lobby in Slay the Spire 2
Getting a session running is straightforward once everyone owns a copy. Here is exactly how it works for both the host and joining players:
As the host:
- Open the Main Menu and select “Co-op”.
- Choose Create Lobby.
- Set your preferred Ascension level and Seed before the run begins.
- Open the Steam Overlay and invite friends directly from your friends list.
As a joining player:
- Accept the Steam invite sent by the host.
- Load your chosen character and starting deck.
- Once all players are ready, the host starts the run.
In-game UI: The top-left corner of the screen displays each teammate’s HP, Energy, and hand size in real time, so you always have a clear read on how your party is doing without leaving your own view.
How Co-op Works in Slay the Spire 2
The Basics
Slay the Spire 2 co-op keeps the core roguelike loop intact. You still build a deck, fight enemies, manage relics and potions, and push through acts toward the final boss. However, the experience shifts significantly when you add more players to the mix.
- All players act simultaneously during combat, rather than taking turns.
- Enemy health and damage scale with the number of players in the party, so the challenge increases as the group grows.
- Most rewards are individual. Each player makes their own card, relic, and potion choices independently.
Shared Map and Navigation
All players navigate the same shared map together, choosing routes as a group. The co-op version of the map includes a map-drawing feature, allowing the party to annotate and plan paths together directly on the map screen. Players can negotiate which encounters each person takes on and coordinate paths to suit the whole team’s build direction.
Relic Selection in Co-op
At relic reward screens, four different relics appear at once, one for each player in a full party. Players need to decide who takes which relic, and it is currently unclear whether two players can select the same relic simultaneously. Based on the current build, the expectation is that players share the pool and negotiate.
Rest Sites
At rest sites, each player chooses their own preferred option independently. Multiple players can select the same option, such as Smith, without restriction. This means the whole party is not locked into a single rest action, and players can prioritise what their individual build needs most.
Co-op Specific Mechanics
Debuffs and Buffs Affect the Whole Team
One of the most important mechanics to understand in Slay the Spire 2 co-op is that debuffs you apply to enemies benefit your entire team. If you apply Vulnerable to an enemy, every player in the party deals increased damage to that target. However, this also works in reverse: all enemy attacks hit every player, so the team cannot rely on one person tanking all the damage.
Epoch Unlocks and Ascension in Co-op
Progression works slightly differently in co-op compared to solo play. Epoch unlocks are shared across the team, meaning the whole party benefits from and contributes to collective lore and content progression. Ascension, however, is handled on a per-player basis, with the host setting the Ascension level for the run at lobby creation.
Multiplayer-Exclusive Cards, Relics, and Potions
Slay the Spire 2 introduces a dedicated pool of multiplayer-specific cards, relics, and potions that only appear in co-op sessions. These are designed around team mechanics and include options to:
- Give teammates Block
- Grant Strength to allies
- Share Energy with other players
- Apply Dexterity buffs across the party
These team-focused cards create natural roles within a party, encouraging players to specialise rather than all building the same way.
Potions in Co-op
Not all potions work the same way in co-op. Here is the key distinction:
| Potion Type | Who It Can Target |
| Throw potions | Can be used on teammates |
| Drink potions (e.g. Fairy in a Bottle) | Self-use only |
Death and Revives
Dying in co-op does not automatically end your run. As long as at least one player remains alive, all dead players revive at the end of the current combat. This applies even in a full party of four, making co-op runs more forgiving on individual mistakes compared to solo play.
Relics and Trading
Relics in co-op only affect the player who holds them. There is currently no way to trade relics between players. Similarly, cards cannot be traded between teammates at this stage of Early Access.
Is Co-op Easier or Harder Than Solo?
The honest answer is that it depends on the fight. Slay the Spire 2’s co-op balance is still actively being tuned during Early Access. Some encounters become easier with four players applying debuffs and covering each other’s weaknesses. However, certain enemies scale with the number of skill cards played, which means a four-player party using skill-heavy builds can actually make specific fights considerably harder.
The current co-op experience plays more like four parallel solo runs happening simultaneously than a deeply interlocking team experience, though Mega Crit has confirmed they are actively developing and refining the system throughout Early Access.
Is Local Co-op Coming to Slay the Spire 2?
Local co-op is not available at launch. According to Mega Crit, much of the game’s design took shape during the pandemic, which meant the concept of couch co-op was not part of the original development vision. However, the developers have acknowledged player feedback on this point and have not ruled out adding local multiplayer in a future update. As of the current Early Access build, online co-op is the only available option.
What Is Still Being Developed in Co-op
Mega Crit is transparent about the co-op mode being a work in progress. Here is what is still being refined:
- Balance across all player counts is actively being adjusted.
- Card and potion trading between players is not currently available.
- Deeper team interactions and more meaningful cross-player combo potential are expected to expand before the 1.0 release.
- Local co-op remains unconfirmed but has not been ruled out.
Key Takeaways
- Slay the Spire 2 supports online co-op for up to 4 players.
- Every player needs their own copy of the game on Steam.
- Co-op runs through private lobbies only — no public matchmaking.
- The host sets up the lobby via Main Menu > Co-op > Create Lobby, then invites friends through the Steam Overlay.
- Local co-op is not available at launch.
- All players act simultaneously in combat, and enemy difficulty scales with party size.
- Epoch unlocks are shared across the team; Ascension is set per-player by the host.
- Multiplayer-exclusive cards, relics, and potions are available only in co-op.
- Dead players revive at the end of combat as long as one teammate survives.
- Debuffs you apply to enemies benefit the whole team, but enemy attacks also hit everyone.
- Relics cannot be traded between players in the current build.
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