The primary Steam source was reviewed on 2026-08-08. Exact values or steps that source does not confirm remain labeled unknown until reproduced in the current version.
The confirmed co-op facts
Online co-op is an official Sephiria feature, and the supported group size reaches up to four players. The group still participates in the same high-level game described by the official listing: a top-down action RPG roguelite about exploring the tower, fighting, collecting and upgrading artifacts, and managing tablets and inventory.
The phrase 'up to four' establishes a maximum, not every other session rule. It does not tell this site whether a public matching queue exists, whether every group uses a dedicated host, how a party invitation appears, or whether any platform outside the Steam context participates. Those questions remain unknown until first-party information confirms them.
- Confirmed mode: online cooperative play
- Confirmed maximum: up to four players
- Confirmed shared game frame: tower exploration and roguelite action
- Unconfirmed: exact lobby and matchmaking flow
Prepare without inventing lobby instructions
Before a planned group session, have each player check the current official listing and the live game's own menus. Agree that one person will report exactly what options are visible, then follow those current prompts. This is safer than copying a button-by-button sequence that the source used for this page never verified and that a patch could change.
For useful troubleshooting context, record the number of intended players, the exact visible game version if shown, and the complete on-screen message. These details do not solve a connection problem by themselves, but they let official support or a current first-party notice address the real state. Do not apply generic port, firewall, or save-file advice as though Sephiria's developer endorsed it.
- Keep the group at four players or fewer
- Use the current in-game prompts for session setup
- Record exact version and error wording when available
- Prefer official support over generic networking changes
Progression and item behavior are not confirmed here
The available first-party evidence does not state who owns a co-op save, whether progress is shared, how artifacts or tablets are distributed, whether items can be traded, or how a disconnected player rejoins. It also does not establish crossplay or a specific matchmaking rule. This page does not borrow answers from another roguelite to fill those gaps.
Specific co-op builds, preset codes, item values, drop rates, boss strategies, and routes are also outside the verified scope. Use the Beginner Guide for the confirmed run loop and the Artifacts and Inventory Guide for a source-audit method. If an official update later explains a multiplayer rule, date and link that source before turning it into guidance.
- No claim about host or save ownership
- No claim about shared progression, trading, or loot allocation
- No claim about crossplay or public matching
- No multiplayer build presented without current evidence