Zenless Zone Zero 2.5 Co-Op Guide: Master Joint Investigation – The Divine Maze (2026)

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For the first time since Zenless Zone Zero launched, the streets of New Eridu are about to get crowded—in the best possible way. Version 2.5, “To Be Fuel for the Night,” introduces the game’s first real-time, combat-focused co-op mode: Joint Investigation: The Divine Maze.

This is your complete, up-to-date guide to mastering this landmark multiplayer event. The update is live, the event is active, and below is everything you need to dominate co-op runs and secure every exclusive reward before it ends.

๐Ÿ—️ How to Unlock Joint Investigation: The Divine Maze

Before you can enter the co-op event, you must meet both prerequisites below.

RequirementDetails
Inter-Knot Level 24This is the correct minimum level. Earlier reports claiming Level 15 were incorrect.
Complete “Mole in the Hole” Agent StorySoldier 11’s multi-part Agent Story commission. It unlocks naturally after Inter-Knot Level 20 and related story progress.

Once both are completed, the event becomes accessible from the Events menu.

⏰ Event Schedule & Availability (Updated)

Zenless Zone Zero 2.5 Co-Op Guide

  • Version 2.5 Launch: December 30, 2025

  • Event Start: Live shortly after the update

  • Event End: February 6, 2026 at 06:00 (UTC+8)

Action Tip: If the event doesn’t appear, double-check your Inter-Knot level and ensure Soldier 11’s Agent Story is fully completed.

๐Ÿ” How Joint Investigation Works (Co-Op Mechanics Explained)

Joint Investigation: The Divine Maze is a 3-player PvE co-op mode built entirely around coordination, timing, and role synergy.

Core Gameplay Loop

  1. Select a Themed Stage
    Each stage features unique combat objectives that test team coordination.

  2. Assemble Your Squad
    Each player controls one Agent. The game recommends team roles:

    • DPS

    • Stun / Break

    • Support

  3. Master the Chain Overdrive

    • All players share a Chain Meter

    • Combos and abilities fill the meter collectively

    • When full, all three players can trigger a synchronized Chain Attack

    • Timing this during enemy breaks or large mob waves is critical

  4. Revive to Survive

    • Fallen teammates can be revived mid-combat

    • Fast revives maintain DPS and often decide success or failure

⭐ What Makes This Co-Op Mode Special

This is not a casual side activity.

Joint Investigation is Zenless Zone Zero’s first true real-time multiplayer combat experience, emphasizing:

  • Team synergy over solo power

  • Shared resources and timing

  • Active battlefield awareness

It represents a major step toward a more connected, cooperative New Eridu.

๐Ÿ† Joint Investigation Event Rewards

Completing co-op challenges rewards players with valuable and exclusive items, including:

  • Polychrome (premium currency)

  • Upgrade Materials (Senior Investigator Logs, Denny, etc.)

  • Exclusive Titles & Namecards to commemorate participation

๐Ÿ’ก Pro Tips for Winning Co-Op Runs

✔ Build a Balanced Team

Avoid stacking pure DPS. A mix of damage, stun, and support leads to smoother clears and faster boss breaks.

✔ Coordinate Chain Overdrive

Use in-game pings or voice chat to trigger Chain Attacks during:

  • Enemy break phases

  • Large enemy clusters

✔ Prioritize Revives

A fallen teammate contributes zero damage. Reviving quickly is a team responsibility, not a support-only job.

✔ Test Buffed Agents

Version 2.5 buffed several older Agents, including:

  • Soldier 11

  • Grace

  • Burnice

This co-op mode is the perfect environment to experiment with their newly improved kits.

๐Ÿš€ What This Means for ZZZ’s Future

According to the official PlayStation Blog, Joint Investigation marks the arrival of “long-awaited multiplayer combat” in Zenless Zone Zero.

While this version of the event is limited-time, its structure strongly suggests:

  • Future co-op events

  • Possible permanent multiplayer modes

  • Expanded group content in later updates

✅ Ready for Deployment?

To jump in:

  1. Reach Inter-Knot Level 24

  2. Complete Soldier 11’s “Mole in the Hole” Agent Story

  3. Open the Events menu and form your squad

Whether you queue with friends or rely on matchmaking, Joint Investigation: The Divine Maze delivers ZZZ’s first true taste of coordinated multiplayer combat. Master the Chain Overdrive, support your team, and earn your rewards before the event ends on February 6, 2026.

❓ FAQ – Joint Investigation Co-Op Event

What if I’m not Inter-Knot Level 24 yet?
Focus on main story missions, daily commissions, and Stamina usage. The event runs until early February, giving you time to level up.

Can this mode be played solo?
No. Joint Investigation is exclusively 3-player co-op.

Is this co-op mode permanent?
This iteration is limited-time and ends with Version 2.5. However, its reception strongly indicates similar co-op content will return.            

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